Consulta: subjectFacets:"Phytoplankton"
Registros recuperados: 369
Data/hora: 09/06/2024 02:07:37

Revealing the Organization of Complex Adaptive Systems through Multivariate Time Series Modeling
Provedor de dados: 7
Autores: Angeler, David G; Swedish University of Agricultural Sciences, Department of Aquatic Sciences and Assessment; david.angeler@slu.se; Drakare, Stina; Swedish University of Agricultural Sciences, Department of Aquatic Sciences and Assessment ; stina.drakare@slu.se; Johnson, Richard K; Swedish University of Agricultural Sciences, Department of Aquatic Sciences and Assessment ; richard.johnson@slu.se.
Revealing the adaptive responses of ecological, social, and economic systems to a transforming biosphere is crucial for understanding system resilience and preventing collapse. However, testing the theory that underpins complex adaptive system organization (e.g., panarchy theory) is challenging. We used multivariate time series modeling to identify scale-specific system organization and, by extension, apparent resilience mechanisms. We used a 20-year time series of invertebrates and phytoplankton from 26 Swedish lakes to test the proposition that a few key-structuring environmental variables at specific scales create discontinuities in community dynamics. Cross-scale structure was manifested in two independent species groups within both communities across...
Tipo: Peer-Reviewed Reports
Palavras-chave: Complex adaptive systems dynamics; Complex adaptive systems organization; Cross-scale structure; Discontinuities; Environmental variables; Invertebrates; Lakes; Panarchy; Phytoplankton; Resilience; Time series modeling.
Ano: 2011

Structure and dynamic of food webs in Andean North Patagonian freshwater systems: organic matter, light and nutrient relationships
Provedor de dados: 67
Autores: Modenutti,Beatriz; Albariño,Ricardo; Bastidas Navarro,Marcela; Díaz Villanueva,Verónica; Souza,María Sol; Trochine,Carolina; Laspoumaderes,Cecilia; Cuassolo,Florencia; Mariluán,Gustavo; Buria,Leonardo; Balseiro,Esteban.
North Andean Patagonian aquatic systems include a number of deep and shallow oligotrophic lakes with a profuse hydrographic net. In this contribution we present a review of the researches carried out during the last decade in the food webs of North Patagonian water bodies. Food webs in these systems were studied based on field surveys, combining with field and laboratory experiments. Deep and shallow lakes were analyzed in relation to light, organic matter, and nutrient constraints as limiting interacting factors. In addition, we have also extended our knowledge on the structure and dynamics of stream food webs by analyzing different aspects of biotic interactions occurring both through the autotrophic and heterotrophic pathways. Since Andean lakes were...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bacterioplankton; Phytoplankton; Zooplankton; Fish; Insects; Lakes and rivers.
Ano: 2010
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1667-782X2010000200003

Responses of plankton and fish from temperate zones to UVR and temperature in a context of global change
Provedor de dados: 67
Autores: Gonçalves,Rodrigo J; Souza,María Sol; Aigo,Juana; Modenutti,Beatriz; Balseiro,Esteban; Villafañe,Virginia E; Cussac,Víctor; Helbling,E Walter.
In the last decades, both temperature and UVB (280-315 nm) radiation on the surface of the Earth increased at growing rates as a result of human activities. Many studies had evaluated the effects of temperature on aquatic ecosystems, but now the field broadens as the combination and variations of temperature and radiation gains especial importance. In this work we attempt to revisit some of our knowledge about the effects of UVR and temperature on marine and freshwater plankton and fish from temperate regions (defined here as latitudes between 30-60º), especially from the Patagonia area, due to the special characteristics found in these sites. UVR affects (often negatively) almost all processes, from carbon fixation to behavior; and certainly all trophic...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Climate change; Bacterioplankton; Phytoplankton; Zooplankton; Fish; Oxidative stress; Upper mixed layer.
Ano: 2010
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1667-782X2010000200005

Сезонная изменчивость скорости роста фитопланктона             в прибрежных водах Чёрного моря (район Севастополя).
Provedor de dados: 13
Autores: Стельмах, Л. В.; Куфтаркова, Е. А.; Бабич, И. И.
На основе данных, полученных на трёх станциях в прибрежных поверхностных водах Чёрного моря (в районе Севастополя) в 2006 – 2007 гг., представлена сезонная динамика удельной скорости роста фитопланктонного сообщества. В течение года этот показатель изменялся приблизительно на порядок. Максимальные значения (2.00 – 2.70 сутки-1) наблюдались в периоды весеннего и осеннего «цветения» воды, вызванного диатомовой водорослью Chaetoceros socialis. Минимальные величины (0.06 – 0.10 сутки-1) отмечены зимой, когда в планктоне доминировали два вида диатомовых водорослей Sceletonema costatum и C. socialis. Получены количественные зависимости между концентрацией нитратов и кремния, с одной стороны, и удельной скоростью роста фитопланктона, с другой. Основным фактором,...
Tipo: Journal Contribution
Palavras-chave: Фитопланктон; Скорость роста; Хлорофилл a; Биогенные вещества; Чёрное море; Phytoplankton; Growth rate; Chlorophyll a; Nutrients; Black Sea; Фітопланктон; Швидкість росту; Хлорофіл a; Біогенні сполуки; Чорне море.
Ano: 2009
URL: http://repository.ibss.org.ua/dspace/handle/99011/843

Photosynthetic characteristics of phytoplankton in the western Black Sea during the autumn bloom.
Provedor de dados: 13
Autores: Finenko, Z. Z.; Churilova, T. Ya.; Parkhomenko, A. V.; Tugrul, S.
In the autumn of 2005 photosynthetic characteristics of phytoplankton were studied along transects from a coast to deep-waters in the western and southern Black Sea. Efficiency of photosynthesis (αB) varied from 0.012 to 0.068 mg C (mg Chl)-1h-1(μE m-2 s-1)-1. Light – saturated rate of chlorophyll a-normalized photosynthesis (P) ranged from 5 mg C (mg Chl)-1 h-1 in the deep-waters to 12 mg C (mg Chl)-1 h-1 in the shelf waters. In the shelf area P and αB varied by a factor of 3. Variability of these parameters was as lower as that of the chlorophyll concentration. The mean αB and P values at the shelf were higher than those of the deep-water region. The phodoadaptive strategy of phytoplankton was characterized by increasing of αB at lower light levels....
Tipo: Journal Contribution
Palavras-chave: Phytoplankton; Photosynthesis; Light; Primary production; Black Sea; Фитопланктон; Фотосинтез; Свет; Первичная продукция; Чёрное море; Фітопланктон; Світло; Первинна продукція; Чорне море.
Ano: 2008
URL: http://repository.ibss.org.ua/dspace/handle/99011/834

Региональная модель для расчёта первичной продукции Чёрного моря с использованием данных спутникового сканера цвета SeaWiFS.
Provedor de dados: 13
Autores: Финенко, З. З.; Суслин, В. В.; Чурилова, Т. Я.
Разработана и применена малопараметрическая региональная модель для оценки первичной продукции Чёрного моря с использованием данных спутникового сканера цвета (SeaWiFS) за 1998 – 2004 гг. В модели использованы результаты исследований фотосинтетических характеристик черноморского фитопланктона и вертикального распределения хлорофилла, послужившие основой для обоснования и создания регионального алгоритма. Использованная  параметризация учитывает совместное действие плотности светового потока, температуры и концентрации хлорофилла  в поверхностном слое на фотосинтетические параметры кривой фотосинтез–свет и их изменение с глубиной. Полученные закономерности соединены с данными спутниковых измерений для оценки пространственно-временной вариабельности...
Tipo: Journal Contribution
Palavras-chave: Чёрное море; Модель; Спутник; Первичная продукция; Хлорофилл; Свет; Фитопланктон; Black Sea; Model; Satellite; Primary production; Chlorophyll; Light; Phytoplankton; Чорне море; Модель; Супутник; Первинна продукція; Хлорофіл; Світло; Фітопланктон.
Ano: 2009
URL: http://repository.ibss.org.ua/dspace/handle/99011/844

Необычное "цветение" в прибрежных водах г. Севастополя
Provedor de dados: 13
Autores: Сеничева, М. И.
On results of long-term monitoring of Sevastopol coastal waters in 2000th the “water-bloom” caused largecell diatoms Proboscia alata is noted the first time. Its mass development in the waters which have been impoverished by mineral forms of biogenic elements allows to suppose at it a presence of abilities to myxtrophic method of feed.
Tipo: Book Section
Palavras-chave: Phytoplankton; Quantity; Biomass; Biogenic elements; “water-bloom”.
Ano: 2010
URL: http://repository.ibss.org.ua/dspace/handle/99011/1885

Особенности внутрипопуляционной изменчивости удельной поверхности фитопланктона Одесского региона (Черное море)
Provedor de dados: 13
Autores: Миничева, Г. Г.; Зотов, А. Б.
Анализируется внутрипопуляционная изменчивость удельной поверхности популяций фитопланктона Черного моря в районе Дунай–Днепровского междуречья и прилегающих водоемов и ее взаимосвязь с доминированием видов фитопланктона. Рассмотрены зависимости между сезонной динамикой удельной поверхности разноразмерных популяций фитопланктона и динамикой их структурных показателей: численности и биомассы.
Tipo: Journal Contribution
Palavras-chave: Фитопланктон; Популяции; Сезонная динамика; Phytoplankton; Population; Season dynamic Phytoplankton Phytoplankton http://aims.fao.org/aos/agrovoc/c_13344.
Ano: 2003
URL: http://repository.ibss.org.ua/dspace/handle/99011/492

Результаты исследований экологического состояния акватории Карадагского природного заповедника (2009 г.)
Provedor de dados: 13
Autores: Ковригина, Н. П.; Трощенко, О. А.; Губанова, В. И.; Субботин, А. А.; Поспелова, Н. В.
distributing of hydrological and hydrochemical indexes and phytoplankton on the Karadag off-shore water in a spring-summer period 2009 is presented. Influence Azov sea and service-utility waters and also presence of the submarine unloading is marked. The estimation of trophic level of the researching waters is given by the sizes of euthrophication index E-TRIX.
Tipo: Book Section
Palavras-chave: Hidrological and hydrochemical parameters; Size of E-TRIX; Phytoplankton.
Ano: 2010
URL: http://repository.ibss.org.ua/dspace/handle/99011/1851

Утилизация консументами взвешенного вещества первичной продукции в планктонном сообществе
Provedor de dados: 13
Autores: Чмыр, В. Д.
Проведен расчётный анализ кинетики взвешенного вещества первичной продукции в планктонном сообществе. Найдены коэффициенты, позволяющие определять количество потребляемого консументами органического вещества фитопланктона в эксперименте по величине приобретаемой ими за время экспозиции радиоуглеродной метки. В зависимости от удельных значений продукции фитопланктона и дыхания консументов, получаемые в эксперименте исходные значения суточного рациона следует умножить в 1.05 – 11 раз, а суточной ассимиляции – в 1.16 – 33.02 раза. На основе проведенных в экваториальной Атлантике экспериментов по накоплению радиоуглеродной метки сетным зоопланктоном рассчитаны также значения вторичной продукции мезозоопланктона. Суточная ассимиляция органического вещества...
Tipo: Journal Contribution
Palavras-chave: Фитопланктон; Первичная продукция; Радиоуглеродный метод; Консументы; Мезозоопланктон; Вторичная продукция; Phytoplankton; Primary production; Radiocarbon method; Consumers; Mesozooplankton; Secondary production Consumers Phytoplankton Primary production Secondary production Consumers Primary production Phytoplankton http://aims.fao.org/aos/agrovoc/c_28315 http://aims.fao.org/aos/agrovoc/c_34329 http://aims.fao.org/aos/agrovoc/c_13344.
Ano: 2006
URL: http://repository.ibss.org.ua/dspace/handle/99011/309

Сезонная изменчивость отношения органического углерода к хлорофиллу «а» и  факторы, ее определяющие в фитопланктоне прибрежных вод Черного моря
Provedor de dados: 13
Autores: Стельмах, Л. В.; Бабич, И. И.
На основе данных, полученных на пяти станциях в прибрежных поверхностных водах Черного моря (в районе Севастополя) в 2002 – 2003 гг., представлена сезонная динамика отношения С:хл “a” в нано- и микрофитопланктоне. В течение года этот показатель изменялся приблизительно на порядок. Наибольшие значения отношения (400 – 500) были получены в летний период (в июле), когда интенсивность солнечной радиации достигала максимума, а концентрация нитратов снижалась до аналитического ноля. Наименьшие величины (30 – 50) отмечены зимой при минимальных интенсивностях солнечной радиации и  относительно высоких (4 – 25 мкМ) концентрациях нитратов. Представлены регрессионные зависимости, отражающие комбинированное действие света, температуры, биогенных веществ и видового...
Tipo: Journal Contribution
Palavras-chave: Хлорофилл "a"; Органический углерод; Фитопланктон; Свет; Биогенные вещества; Черное море; Сhlorophyll "a"; Phytoplankton; Organic carbon; Light; Nutrients; Black Sea Phytoplankton Organic carbon Light Nutrients (mineral) Light Phytoplankton http://aims.fao.org/aos/agrovoc/c_4322 http://aims.fao.org/aos/agrovoc/c_13344.
Ano: 2006
URL: http://repository.ibss.org.ua/dspace/handle/99011/315

Сезонные изменения скорости роста и лимитирование фитопланктона питательными веществами в прибрежных водах Черного моря в районе Севастополя
Provedor de dados: 13
Autores: Стельмах, Л. В.; Губанов, В. И.; Бабич, И. И.
Исследована сезонная динамика скорости роста микро- и нанофитопланктона и ее зависимость от концентрации основных биогенных веществ в среде в прибрежных поверхностных водах Черного моря  в районе Севастополя. Показано, что скорость роста фитопланктона лимитируется соединениями азота в течение большей части  года. В холодный период (ноябрь – апрель), когда количество нитратов в воде было сравнительно высоким (1 - 10 мкМ), скорость роста микро- и нанофитопланктона определялась их концентрацией в соответствии с уравнением Михаэлиса-Ментен. В теплое время (май – октябрь) при более низких концентрациях нитратов в среде (в основном  менее 1мкМ) скорость роста водорослей связана гиперболической зависимостью с  содержанием аммония.  Степень азотного лимитирования...
Tipo: Journal Contribution
Palavras-chave: Фитопланктон; Лимитирование; Биогенные вещества; Черное море; Phytoplankton; Limitation; Nutrients; Black Sea Nutrients (mineral) Phytoplankton Phytoplankton http://aims.fao.org/aos/agrovoc/c_13344.
Ano: 2004
URL: http://repository.ibss.org.ua/dspace/handle/99011/135

Расчет объемов и площадей поверхности одноклеточных водорослей Черного Моря
Provedor de dados: 13
Autores: Брянцева, Ю. В.; Лях, А. М.; Сергеева, А. В.
В пособии представлены изображения 37 геометрических фигур, используемых для вычисления биомассы и площади поверхности одноклеточных водорослей методом “истинного объема” Приводятся соответствующие расчетные формулы. Впервые указаны подобные геометрические фигуры и поправочные коэффициенты _соотношения между видимыми и невидимыми параметрами клеток, для 250 видов черноморского фитопланктона. Пособие предназначено для гидробиологов, экологов, океанологов.
Tipo: Other
Palavras-chave: Volume; Phytoplankton; Algae; Cells; Cells; Volume; Phytoplankton; Algae; Http://aims.fao.org/aos/agrovoc/c_1418; Http://aims.fao.org/aos/agrovoc/c_8288; Http://aims.fao.org/aos/agrovoc/c_13344; Http://aims.fao.org/aos/agrovoc/c_258.
Ano: 2005
URL: http://repository.ibss.org.ua/dspace/handle/99011/657

Воздействие глобальных климатических и региональных  факторов на мелких пелагических рыб Чёрного  моря.
Provedor de dados: 13
Autores: Шульман, Г. Е.; Никольский, В. Н.; Юнева, Т. В.; Щепкина, А. М.; Бат, Л.; Кидейш, А. Е.
Рассмотрена многолетняя динамика содержания жира у шпрота и анчоуса Чёрного моря как индикаторов обеспеченности пищей в связи с температурой воды, концентрацией фитопланктона, величинами запасов и уловов этих рыб. Глобальным климатическим фактором, оказывающим прямое и косвенное влияние на обеспеченность мелких пелагических рыб Чёрного моря пищей, является температура. Региональные факторы, воздействующие на состояние шпрота и анчоуса, – пищевая конкуренция, речной сток и загрязнение водной среды.
Tipo: Journal Contribution
Palavras-chave: Шпрот; Анчоус; Содержание жира; Обеспеченность пищей; Температура; Конкуренция; Фитопланктон; Запасы и уловы; Чёрное море; Sprat; Anchovy; Fat content; Food supply; Temperature; Competition; Phytoplankton; Stocks and yields; Black Sea; Камса; Вміст жиру; Забезпеченість їжею; Конкуренція; Фітопланктон; Вилови; Чорне море.
Ano: 2007
URL: http://repository.ibss.org.ua/dspace/handle/99011/854

Характеристика размерной структуры фитопланктона по измерениям хлорофилла «а»
Provedor de dados: 13
Autores: Осадчая, Т. С.
Представлена характеристика сезонных вариаций структуры  фитопланктона по трём размерным категориям (микро-, нано- и пикофитопланктона) в различных участках Севастопольской бухты.
Tipo: Journal Contribution
Palavras-chave: Phytoplankton; Seasonal variations; Phytoplankton; Http://aims.fao.org/aos/agrovoc/c_13344.
Ano: 2007
URL: http://repository.ibss.org.ua/dspace/handle/99011/592

Light absorbtion and maximum yield of photosynthesis during autumn phytoplankton bloom in the western Black Sea.
Provedor de dados: 13
Autores: Churilova, T. Ya.; Finenko, Z. Z.; Turgul, S.
In the frame of GEF/UNDP Black Sea Ecosystem Recovery Project the effect of nutrient availability on phytoplankton light absorption and maximum quantum yield of carbon fixation (фmax) has been investigated. It has been found out that chlorophyll a concentration (Chl a) varied from 0.3 to 10 mg m-3 increasing from deep-water region to shelf waters. At the shallow stations, where upper mixed layer spread deeper the bottom of euphotic zone, the homogenous pigment distribution was observed. In the deep-water region the Chl a profiles showed the presence of a deep Chl a maximum (DCM) below a seasonal density cline. The functional characteristics of phytoplankton showed depth-dependent variation. The phytoplankton from DCM was characterized 20 % lower values of...
Tipo: Journal Contribution
Palavras-chave: Chlorophyll a; Phytoplankton; Light absorption; Maximum quantum yield; Nutrients; Хлорофилл a; Фитопланктон; Поглощение света; Максимальный квантовый выход; Биогенные элементы; Хлорофіл а; Фітопланктон; Поглинання світла; Максимальний квантовий вихід; Біогенні елементи.
Ano: 2008
URL: http://repository.ibss.org.ua/dspace/handle/99011/823

Видовое разнообразие фитопланктона Чёрного моря как характеристика состояния экосистемы
Provedor de dados: 13
Autores: Теренько, Г. В.
Дана сравнительная характеристика видового разнообразия фитопланктона прибрежных зон Черного моря - Одесского залива и относительно чистого района о. Змеиный. При анализе структуры фитопланктонного сообщества использовали показатели видового богатства, индекс Шеннона, индекс выровненности Пиелу, кривые доминирования-разнообразия. Сравнительный анализ показал, чго типичной реакцией на антропогенный стресс фитогшанктонного сообщества прибрежной зоны Одесского залива явилось уменьшение количества видов и их разнообразия, а также упрощение его структуры.
Tipo: Journal Contribution
Palavras-chave: Phytoplankton; Phytoplankton; Http://aims.fao.org/aos/agrovoc/c_13344.
Ano: 2001
URL: http://repository.ibss.org.ua/dspace/handle/99011/565

Сезонные изменения  концентрации хлорофилла “а” и отношения органический  углерод / хлорофилл “а”в  фитопланктоне прибрежных вод  Черного моря в районе Севастополя по результатам исследований в 2000 – 2001 гг.
Provedor de dados: 13
Autores: Стельмах, Л. В.; Бабич, И. И.; Ляшенко, С. В.
На основе  данных, полученных на трех станциях   в прибрежных водах Черного моря  в районе  Севастополя в 2000 – 2001 гг , представлена сезонная динамика  концентрации хлорофилла “a” в планктоне и отношения С/Хл”a” в микро- и наннофитопланктоне поверхностных вод.  В  течение года эти  показатели изменялись более, чем на порядок.  Так, концентрация хлорофилла “а”  изменялась от 0,21 до 14,28 мг. м-3 и достигала максимальных значений в весенний и осенний периоды, что обусловлено “цветением” диатомовых водорослей Chaetoceros socialis весной и Cerataulina bergonii осенью.  Максимальные значения отношения С/Хл”a”  (158  - 183 ) были получены в летний период (в июле), когда в фитопланктоне доминировали пирофитовые водоросли, минимальные значения (13 –20)...
Tipo: Journal Contribution
Palavras-chave: Фитопланктон; Хлорофилл "a"; Диатомовые водоросли; Пирофитовые водоросли; Chlorophyll “a”; Seasonal variability; Phytoplankton; Pyrrophyta Seasonal variations Phytoplankton Chlorophylls Diatoms Phytoplankton Chlorophylls Diatoms http://aims.fao.org/aos/agrovoc/c_13344 http://aims.fao.org/aos/agrovoc/c_1577 http://aims.fao.org/aos/agrovoc/c_32657.
Ano: 2002
URL: http://repository.ibss.org.ua/dspace/handle/99011/411

Tohu-va-Vohu of the quasi-stochastic phytoplankton in the Sea of the Galilee
Provedor de dados: 13
Autores: Kamenir, Y.
The stability analysis of natural communities and ecosystems requires quantitative means capable of evaluating the structural variability of the aquatic community or assemblage taken as a whole. Size spectrum (SS) provides such assessment and is most often applied to the size distribution of particles or organisms of the given community. Another old, but rarely used, special case of SS describes the size-frequency distribution of taxonomic units encompassed by an assemblage, and is called here 'taxonomic size spectrum' (TSS). The phytoplankton assemblage of the sea of the Galilee (Lake Kinneret), Israel, was used to compare several years (out of the 30-year monitoring period) characterized with the most pronounced abnormalities in many biotic and abiotic...
Tipo: Journal Contribution
Palavras-chave: Phytoplankton; Community structure; Taxonomic size spectra; Composite size spectra; Environmental stress; Lake Kinneret; Фитопланктон; Структура сообщества; Таксономический размерный спектр; Комплексный размерный спектр; Природный стресс; Озеро Киннерет Phytoplankton Phytoplankton http://aims.fao.org/aos/agrovoc/c_13344.
Ano: 2005
URL: http://repository.ibss.org.ua/dspace/handle/99011/241

Компьютерная программа для расчета основных параметров фитопланктона
Provedor de dados: 13
Autores: Лях, А. М.; Брянцева, Ю. В.
Предлагаемая компьютерная программа предназначена для обработки данных о структурных характеристиках фитопланктона. В статье рассмотрены структура базы данных и основные программные модули. Модуль обработки позволяет получить следующие результаты: значения средних, минимальных и максимальных объемов и площадей поверхности микроводорослей, численность и биомассу клеток, ABC-индексы, индексы видового разнообразия (Шеннона, Симп-сона), список доминирующих таксонов и стадий сукцессии фитопланктонного сообщества.
Tipo: Journal Contribution
Palavras-chave: Data; Phytoplankton; Phytoplankton; Data; Http://aims.fao.org/aos/agrovoc/c_13344; Http://aims.fao.org/aos/agrovoc/c_49816.
Ano: 2001
URL: http://repository.ibss.org.ua/dspace/handle/99011/575

Пeрвичная продукция и биотический баланс морских экосистем
Provedor de dados: 13
Autores: Чмыр, В. Д.
Рассматривается кинетика вновь образованного в процессе фотосинтеза органического вещества фитопланктона, выедаемого консументами за время экспозиции  при определении первичной продукции радиоуглеродным методом. Дана оценка воздействия консументов на величину измеряемой первичной продукции и возможных последствий для расчетов баланса вещества и энергии экосистем морской пелагиали.
Tipo: Journal Contribution
Palavras-chave: Первичная продукция; Биотический баланс; Экосистемы; Фитопланктон; Кинетика; Primary production; Phytoplankton; Kinetic; Biotic balance; Ecosystems Kinetics Primary production Ecosystems Phytoplankton Primary production Ecosystems Phytoplankton http://aims.fao.org/aos/agrovoc/c_34329 http://aims.fao.org/aos/agrovoc/c_2482 http://aims.fao.org/aos/agrovoc/c_13344.
Ano: 2002
URL: http://repository.ibss.org.ua/dspace/handle/99011/400

Сезонные изменения удельной скорости роста фитопланктона и его потребления микрозоопланктоном в прибрежных водах Чёрного моря
Provedor de dados: 13
Autores: Стельмах, Л. В.
For the first time for the Black Sea it is shown that within a year the maximum concentration of chlorophyll a were observed in the periods when the difference between phytoplankton growth and microzooplankton grazing reached the largest values.
Tipo: Book Section
Palavras-chave: Phytoplankton; Specific speed of growth; Consumption of phytoplankton; Microzooplankton; Biogenic matters; Black sea.
Ano: 2010
URL: http://repository.ibss.org.ua/dspace/handle/99011/1891

Акватория и берега Севастополя: экосистемные процессы и услуги обществу
Provedor de dados: 13
Autores: Шадрин, Н. В.; Павлова, Е. В.
В монографии представлены результаты изучения современной экологической ситуации в акватории Севастополя. Рассмотрены также вопросы взаимосвязей функционирования экосистем и социально-экономического развития. Для экологов, экономистов, менеджеров, студентов и жителей Севастополя.
Tipo: Book
Palavras-chave: Ecosystems; Scales; Models; Anthropogenic factors; Eutrophication; Ichthyoplankton; Phytoplankton; Zooplankton; Oil pollution; Litter; Mortality; Coastal zone; Biodiversity; Rivers; Zooplankton; Ecosystems; Scales; Models; Eutrophication; Rivers; Biodiversity; Phytoplankton; Anthropogenic factors; Mortality; Http://aims.fao.org/aos/agrovoc/c_15490; Http://aims.fao.org/aos/agrovoc/c_2482; Http://aims.fao.org/aos/agrovoc/c_6838; Http://aims.fao.org/aos/agrovoc/c_4881; Http://aims.fao.org/aos/agrovoc/c_2734; Http://aims.fao.org/aos/agrovoc/c_6617; Http://aims.fao.org/aos/agrovoc/c_33949; Http://aims.fao.org/aos/agrovoc/c_13344; Http://aims.fao.org/aos/agrovoc/c_34996; Http://aims.fao.org/aos/agrovoc/c_4945.
Ano: 1999
URL: http://repository.ibss.org.ua/dspace/handle/99011/381

Микропланктон западной части пролива Брансфилда: структура численности и биомассы в марте 2002 г.
Provedor de dados: 13
Autores: Серегин, С. А.; Кузьменко, Л. В.; Сысоев, А. А.; Гаврилова, Н. А.
Обсуждаются результаты исследований микропланктона (фито- и бактериопланктон, раковинные инфузо­рии) фотического слоя вод западной части пролива Брансфилда (Антарктика), проведенных в рамках 7-й Ук­раинской антарктической экспедиции (УАЭ) в марте 2002 г. Показатели обилия микропланктона в разных участках полигона различались в 2 - 40 раз. Учитывая видовую структуру и характер распределения числен­ности и биомассы микропланктона, на изученной акватории выделены несколько зон. Воды северной зоны -в пространстве между островами Смита, Сноу, Ливингстона и Дисепшен - с наибольшими значениями чис­ленности и биомассы микропланктона охарактеризованы как эвтрофные. Минимальные показатели отмече­ны в Юго-Восточной зоне - в районе о. Тринити и вдоль побережья...
Tipo: Journal Contribution
Palavras-chave: Сообщество микропланктона; Фитопланктон; Бактериопланктон; Распределение численно­сти и биомассы; Microplankton community; Phytoplankton; Bacterioplankton; Number and biomass distributions; Brans­field Strait.
Ano: 2005
URL: http://repository.ibss.org.ua/dspace/handle/99011/207

Возможности использования методического аппарата морфо-функциональной оценки водной растительности
Provedor de dados: 13
Autores: Миничева, Г. Г.; Зотов, А. Б.; Косенко, М. Н.
В рамках направления морфо-функциональной экологии водной растительности анализируются особенности подходов, сформировавшихся в процессе развития двух школ: лаборатории экологического метаболизма ИнБЮМ, под руководством д. б. н. К. М. Хайлова (ЛЭМ), и альгологической группы Одесского Филиала ИнБЮМ, под руководством д. б. н. Г. Г. Миничевой (ОФ). Обсуждается сходство и различия методов измерения и расчета удельной и общей поверхности фитосистем на различных уровнях организации. Делается вывод об использовании единого методологического принципа, основанного на учете морфо-функциональных свойств каждого уровня иерархической организации растительных систем. Показано, что различия, существующие в расчете показателей поверхности, связаны не с методами расчетов...
Tipo: Journal Contribution
Palavras-chave: Водная растительность; Параметры поверхности; Фитобентос; Фитопланктон; Прогноз; Aquatic vegetation; Surface parameters; Phytobenthos; Phytoplankton; Prognoses Phytoplankton Phytobenthos Phytoplankton Phytobenthos http://aims.fao.org/aos/agrovoc/c_13344 http://aims.fao.org/aos/agrovoc/c_13337.
Ano: 2004
URL: http://repository.ibss.org.ua/dspace/handle/99011/98

Сезонная изменчивость количественного развития фитопланктона у Аргентинских островов (Антарктика).
Provedor de dados: 13
Autores: Кузьменко, Л. В.; Игнатьев, С. М.
Приводятся результаты исследования количественного развития фитопланктона для прибрежных вод Аргентинского архипелага. Материалы собраны в 7-й УАЭ (зимовка 2002 – 2003 гг.) и 10-й УАЭ (сезонные работы 2005 г.). Впервые получены сведения о сезонной динамике количественного развития, видовом разнообразии фитопланктона, выделены доминирующие виды, сроки их массовой вегетации и стадии сукцессии. В водах архипелага обнаружено 126 видов и разновидностей микроводорослей, 73% из которых – диатомовые, 16,6 % - динофитовые. Исследования, проведённые антарктической осенью 2005 г., дополнили список видов на 31 таксон. Наиболее высокие показатели обилия фитопланктона получены для весенне-летнего сезона, когда в октябре наблюдалось «цветение» воды, вызванное мелкими...
Tipo: Journal Contribution
Palavras-chave: Фитопланктон; Численность; Биомасса; Видовой состав; Аргентинские о-ва; Антарктика; Phytoplankton; Abundance; Biomass; Species composition; Argentine Islands; Antarctic; Фітопланктон; Чисельність; Біомаса; Видовий склад; Аргентинські о-ви.
Ano: 2007
URL: http://repository.ibss.org.ua/dspace/handle/99011/847

Диатомовые водоросли планктона Черного моря
Provedor de dados: 13
Autores: Прошкина-Лавренко, А. И.
Tipo: Book
Palavras-chave: Диатомовые водоросли; Фитопланктон; Морфология; Систематика; Diatoms; Phytoplankton; Morphology Diatoms Diatoms http://aims.fao.org/aos/agrovoc/c_32657.
Ano: 1955
URL: http://repository.ibss.org.ua/dspace/handle/99011/569

Итоги и перспективы исследования фитопланктона северо-западной части Черного моря
Provedor de dados: 13
Autores: Нестерова, Д. А.
Изложены результаты исследований фитопланктона северо-западной части Черного моря за более чем  столетний период наблюдений. Основное внимание уделено реакции фитопланктона на антропогенное эвтрофирование, усилившееся в последние десятилетия. Намечены основные направления дальнейших исследований фитопланктона
Tipo: Journal Contribution
Palavras-chave: Фитопланктон; Видовой состав; “цветение” воды; Сукцессии; Черное море; Phytoplankton; Phytoplankton Phytoplankton http://aims.fao.org/aos/agrovoc/c_13344.
Ano: 2003
URL: http://repository.ibss.org.ua/dspace/handle/99011/486

Расчет показателей поверхности фитопланктона с помощью компьютерной программы
Provedor de dados: 13
Autores: Зотов, А. Б.; Дятлова, М. С.; Макаров, А. В.
Представлена компьютерная программа «Альголог», разработанная для расчета структурных и морфофункциональных показателей фитопланктона. В программе применены модифицированные методики вычисления площади поверхности и объема клеток, а также комплекса морфофункциональных показателей одноклеточных водорослей фитопланктона. Приведены вводные параметры, расчитываемые показатели, форма отчета, особенности структуры программы.
Tipo: Journal Contribution
Palavras-chave: Фитопланктон; Компьютерная программа; Морфофункциональные показатели; Удельная поверхность; Phytoplankton; Computer programm; Morphofunctional indices Computer programs Phytoplankton Computer programs Phytoplankton http://aims.fao.org/aos/agrovoc/c_24149 http://aims.fao.org/aos/agrovoc/c_13344.
Ano: 2003
URL: http://repository.ibss.org.ua/dspace/handle/99011/585

Вертикальное распределение хлорофилла и флуоресценции в Черном море
Provedor de dados: 13
Autores: Финенко, З. З.; Чурилова, Т. Я.; Ли, Р. И.
На основании обобщения большого количества данных, полученных в результате исследований многих ав­торов, установлены временные и региональные изменения вертикального распределения концентрации хло­рофилла, флуоресценции. В холодный период (с декабря по март), когда вертикальное перемешивание по­верхностного слоя происходит достаточно активно, концентрация хлорофилла в глубоководных районах мо­ря распределена относительно равномерно в слое до 40 - 50 м. В теплый период (с мая по октябрь), после установления температурной стратификации в верхнем слое, преобладают профили с одним максимумом хлорофилла. Глубина расположения максимума хлорофилла меняется в широких пределах и зависит от его концентрации. Увеличение содержания хлорофилла в планктоне приводит к...
Tipo: Journal Contribution
Palavras-chave: Черное море; Флуоресценция; Хлорофилл а; Фитопланктон; Биогенные вещества; Свет; The Black Sea; Chlorophyll a; Fluorescence; Phytoplankton; Nutrients; Irradiance Irradiance Nutrients (mineral) Phytoplankton Fluorescence Chlorophylls Fluorescence Phytoplankton Chlorophylls http://aims.fao.org/aos/agrovoc/c_10935 http://aims.fao.org/aos/agrovoc/c_13344 http://aims.fao.org/aos/agrovoc/c_1577.
Ano: 2005
URL: http://repository.ibss.org.ua/dspace/handle/99011/189

Изменчивость структурных характеристик фитопланктона в Черном Море
Provedor de dados: 13
Autores: Брянцева, Ю. В.
Диссертация на соискание ученой степени кандидата биологических на- ук по специальности 03.00.17 – гидробиология. – Институт биологии южных морей им. А.О. Ковалевского НАН Украины, Севастополь, 1999. Впервые, на основе регулярных сезонных наблюдений в течение годо- вого цикла (март, май, июль, сентябрь, ноябрь 1992 и февраль 1993 гг.) по единой сетке станций получены подробные данные по фитопланктону обшир- ной акватории северной части Черного моря. Исследованы структурные ха- рактеристики фитопланктона в различных районах Черного моря, выделенных в соответствии с его естественными океанологическими зонами. Выявлены особенности в сезонной сукцессии комплексов видов фитопланктона а также рассчитаны значения его среднего обилия и суммарного запаса в этих...
Tipo: Theses and Dissertations
Palavras-chave: Фитопланктон; Сезонная сукцессия; Многолетние изменения; Естественные и антропогенные факторы; Black Sea; Phytoplankton; Seasonal succession; Long term changes; Natural and anthropogenic factors. Phytoplankton Long-term changes Phytoplankton http://aims.fao.org/aos/agrovoc/c_13344.
Ano: 2000
URL: http://repository.ibss.org.ua/dspace/handle/99011/662

Optimisation de l’identification et du dénombrement du microphytoplancton avec le système couplé de numérisation et d’analyse d’images FlowCAM – Zoo/PhytoImage (système innovant). Action 9 – Livrable 3. Evolution du matériel de numérisation : prototype FastCAM et perspectives. Rapport final, février 2016
Provedor de dados: 5
Autores: Colas, Florent; Tardivel, Morgan; Evrard, Justine; Forest, Bertrand; Crassous, Marie-pierre; Lunven, Michel; Danielou, Marie-madeleine.
This deliverable contains all development work of the FastCAM, new tool for fast imaging of the phytoplankton, which took place in 2015. It consists of: One report of the FastCAM and its comparison with the FlowCAM presentation: The FlowCAM enables the digitalization of a sample of phytoplankton with X10 and X 4 magnifications. The first allows a better morphological description and therefore a higher taxonomic resolution but with a longer scan time (16 X). Thus, for routine analyses, only scanning at 4 X is possible. A considerable gain would be able to do an acquisition to the magnification 10 X with a time of analysis more short, comparable to 4 X. A fast flow imaging system has therefore developed in this sense. He was called FastCAM. The system is...
Tipo: Text
Palavras-chave: FlowCAM; FastCAM; Imagerie rapide; Phytoplancton; REPHY.; FlowCAM; FastCAM; Fast imaging; Phytoplankton; REPHY.
Ano: 2016
URL: http://archimer.ifremer.fr/doc/00363/47420/47425.pdf

Nutrient and phytoplankton distribution in the Loire River plume (Bay of Biscay, France) resolved by a new Fine Scale Sampler
Provedor de dados: 5
Autores: Lunven, Michel; Guillaud, Jean-francois; Youenou, Agnes; Crassous, Marie-pierre; Berric, Roger; Le Gall, Erwan; Kerouel, Roger; Labry, Claire; Aminot, Alain.
A new Fine Scale Sampler (FSS) was designed and used in the Loire River plume (Bay of Biscay, France) in order to study phytoplankton distribution in highly stratified water columns. The FSS consists of a linear array of 15 sampling bottles, set horizontally at 20 cm intervals. Data acquired from the CTD and fluorescence probe of the FSS enable it to be precisely positioned at the depth of the highest density gradient or at the chlorophyll a maximum. The FSS made it possible to investigate fine scale vertical distribution of phytoplankton and relationships with water density, nutrient concentrations or light availability, for spring and summer conditions. Under spring conditions, the entire upper layer exhibited a dominant diatom population (Chaetoceros...
Tipo: Text
Palavras-chave: Plankton patchiness; Density discontinuity; Sampling; Thin layer; Nutrients; Phytoplankton.
Ano: 2005
URL: http://archimer.ifremer.fr/doc/2005/publication-533.pdf

When everything is not everywhere but species evolve: an alternative method to model adaptive properties of marine ecosystems
Provedor de dados: 5
Autores: Sauterey, Boris; Ward, Ben A.; Follows, Michael J.; Bowler, Chris; Claessen, David.
The functional and taxonomic biogeography of marine microbial systems reflects the current state of an evolving system. Current models of marine microbial systems and biogeochemical cycles do not reflect this fundamental organizing principle. Here, we investigate the evolutionary adaptive potential of marine microbial systems under environmental change and introduce explicit Darwinian adaptation into an ocean modelling framework, simulating evolving phytoplankton communities in space and time. To this end, we adopt tools from adaptive dynamics theory, evaluating the fitness of invading mutants over annual timescales, replacing the resident if a fitter mutant arises. Using the evolutionary framework, we examine how community assembly, specifically the...
Tipo: Text
Palavras-chave: Phytoplankton; Competition; Trait-based adaptive strategies; Adaptive dynamics; Eco-evolutionary dynamics; Trade-off; Community; Global circulation model.
Ano: 2015
URL: https://archimer.ifremer.fr/doc/00617/72883/71917.pdf

A single bio-energetics growth and reproduction model for the oyster Crassostrea gigas in six Atlantic ecosystems
Provedor de dados: 5
Autores: Alunno-bruscia, Marianne; Bourles, Yves; Maurer, Daniele; Robert, Stephane; Mazurie, Joseph; Gangnery, Aline; Goulletquer, Philippe; Pouvreau, Stephane.
Many studies based on bioenergetics growth models have investigated the effects of environmental factors on oyster (Crassostrea gigas) growth and physiology. However, most of these models are site-specific and cannot be applied to other culture sites without the re-estimation of parameters or re-formulation of some processes. We aimed to develop a generic growth model suitable for application in contrasting environments, with a constant set of parameters. We tested the oyster-DEB model (Bourlès et al. 2009) for the stimulation of C. gigas growth in different cohorts (spats and adults) at major shellfish culture sites in France, in several years: Arcachon (1993–1994); Marennes-Oléron (2007); Quiberon (1999, 2000, 2001); Rade de Brest (2008); Baie du...
Tipo: Text
Palavras-chave: DEB theory; Modelling; Bivalves; Crassostrea gigas; Phytoplankton; Temperature effect; Coastal environment.
Ano: 2011
URL: http://archimer.ifremer.fr/doc/00043/15403/12762.pdf

Le maximum saisonnier de Dynophysis cf acuminata à Antifer (Normandie, France)
Provedor de dados: 5
Autores: Lassus, Patrick; Maggi, Pierre; Proniewski, F.; Truquet, Philippe; Bardouil, Michele.
Since 1987 Antifer oil tanker terminal (Normandy, France) was weIl known, as a preferential area for summer highest blooms of Dinophysis cf acuminata, a toxic dinoflagellate. Three oceanographic cruises were made in August 1989, before, in the course of and after the seasonal max. of this species. Results obtained from these cruises (hydrological parameters and phytoplankton) as weIl as from a daily survey at a reference station in Antifer harbour, corrobora te the prevailing role of coastal up flowing of Seine estuarine waters, pushed to the coast by a dominant S - SW wind, on intensity and duration of Dinophysis bloom. Such observations are in agreement with those of Summer 1987 at reference station.
Tipo: Text
Palavras-chave: Antifer; Dinophysis; Hydrologie; Phytoplancton; Antifer; Dinophysis; Hydrology; Phytoplankton.
Ano: 1990
URL: http://archimer.ifremer.fr/doc/00138/24946/23039.pdf

Caracteristiques saisonnieres de l'hydrobiologie du complexe estuariende Marennes-Oleron (France).
Provedor de dados: 5
Autores: Heral, Maurice; Razet, Daniel; Deslous-paoli, Jean-marc; Berthome, Jean-paul; Garnier, J.
Four seasonal compaigns providing a sampling of 15 stations each followed during half a tide cycle, i.e. 120 water samples permit the definition of the main hydrobiological features of Marennes-Oleron Bay: salinity and turbidity, phytoplanktonic biomasses, ATP concentrations. The authors suggest that a new way of adapted sampling to their objectives, will work out in the future by sampling during tidal cycles but as frequently as possible.
Tipo: Text
Palavras-chave: Seasonal variations; Salinity; ATP; Estuaries; Turbidity; Hydrobiology; Salinity; Phytoplankton; Estuaries; Biomass; Hydrobiology; Physicochemical properties; Phytoplankton; Environmental conditions; Biomass.
Ano: 1982
URL: http://archimer.ifremer.fr/doc/1982/publication-1854.pdf

Turbidity retrieval and monitoring of Danube Delta waters using multi-sensor optical remote sensing data: An integrated view from the delta plain lakes to the western-northwestern Black Sea coastal zone
Provedor de dados: 5
Autores: Guttler, Fabio; Niculescu, Simona; Gohin, Francis.
Based on multi-sensor optical remote sensing techniques, more than 80 medium and high spatial resolution satellite images were used for studying the turbidity patterns of Danube Delta waters. During a selected 4-year temporal coverage (2006 to 2009), the turbidity gradients were simultaneously analyzed in the delta plain lakes and in the Black Sea western-northwestern coastal zone. Two distinct, but complementary, methodologies for retrieving turbidity were employed, one for the lakes and the other for the coastal zone. After comparing the turbidity satellite-derived turbidity products with in-situ measurements, the inter-comparability of the products was independently verified. Then, through an integrative analysis, the initial hypothesis of turbidity...
Tipo: Text
Palavras-chave: Turbidity; Satellite remote sensing; Danube Delta; Delta plain lakes; Western-northwestern Black Sea; Danube River plume; Phytoplankton; Macrophytes.
Ano: 2013
URL: http://archimer.ifremer.fr/doc/00135/24622/23607.pdf

Evaluation of FluoroProbe® performance for the phytoplankton-based assessment of the ecological status of Mediterranean coastal lagoons
Provedor de dados: 5
Autores: Garrido, Marie; Cecchi, Philippe; Malet, Nathalie; Bec, Beatrice; Torre, Franck; Pasqualini, Vanina.
The European Water Framework Directive and several other legislations worldwide have selected phytoplankton for monitoring the ecological status of surface waters. This assessment is a complicated task in coastal lagoons due to their intrinsic variability, prompting moves to use real-time measurements. Here, we tested the ability of the submersible spectrofluorometer FluoroProbe® to accurately estimate the phytoplankton biomass and to efficiently discriminate spectral groups in Mediterranean coastal lagoons, by using sub-surface water samples (n = 107) collected at Biguglia lagoon (Corsica) in different environmental situations (salinity and trophic state) from March 2012 to December 2014. We compared the estimates of biomass and phytoplankton group...
Tipo: Text
Palavras-chave: Phytoplankton; Monitoring; Mediterranean coastal lagoons; FluoroProbe (R); HPLC.
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00484/59582/62623.pdf

A Feedback Mechanism to Control Apoptosis Occurs in the Digestive Gland of the Oyster Crassostrea gigas Exposed to the Paralytic Shellfish Toxins Producer Alexandrium catenella
Provedor de dados: 5
Autores: Rolland, Jean-luc; Medhioub, Walid; Vergnes, Agnes; Abi-khalil, Celina; Savar, Veronique; Abadie, Eric; Masseret, Estelle; Amzil, Zouher; Laabir, Mohamed.
To better understand the effect of Paralytic Shellfish Toxins (PSTs) accumulation in the digestive gland of the Pacific oyster, Crassostrea gigas, we experimentally exposed individual oysters for 48 h to a PSTs producer, the dinoflagellate Alexandrium catenella. In comparison to the effect of the non-toxic Alexandrium tamarense, on the eight apoptotic related genes tested, Bax and BI.1 were significantly upregulated in oysters exposed 48 h to A. catenella. Among the five detoxification related genes tested, the expression of cytochrome P450 (CYP1A) was shown to be correlated with toxin concentration in the digestive gland of oysters exposed to the toxic dinoflagellate. Beside this, we observed a significant increase in ROS production, a decrease in...
Tipo: Text
Palavras-chave: Shellfish; Toxin; Biomarker; Expression; Phytoplankton.
Ano: 2014
URL: http://archimer.ifremer.fr/doc/00225/33606/32003.pdf

Rain-derived particles and CDOM distribution along the East Coast of New Caledonia
Provedor de dados: 5
Autores: Dupouy, Cecile; Wattelez, Guillaume; Lefevre, Jerome; Juillot, Farid; Andreoli, Remi; Lille, Didier; Murakami, Hiroshi; Roettgers, Rudiger; Frouin, Robert.
Shortly after strong rains or tropical storms, chlorophyll-a concentration (Chla), turbidity, and colored dissolved organic matter (CDOM) in the lagoon of New Caledonia may be tripled. This effect is visible as far as 50 km offshore. The Eastern Coast of New Caledonia is more impacted than the Western Coast because of its geomorphological structure. Higher frequency and intensity of the rains, and the dominance of highly erosive lateritic formations resulted from deep weathering of ultramafic rocks. At the deeper parts of the lagoon (&gt; 20 m), increases of Chla, turbidity, and CDOM absorption can be detected by satellite imagery with their plumes extending off shore as a result of wind-driven circulation in the lagoon. Such -increases agree with the...
Tipo: Text
Palavras-chave: Minerals; Phytoplankton; CDOM; FDOM; Ocean color; Reflectance; New Caledonia; Tropical Pacific Ocean; Lagoons.
Ano: 2018
URL: https://archimer.ifremer.fr/doc/00481/59308/62064.pdf

Production and consumption of B group vitamins in situ.
Provedor de dados: 5
Autores: Kurata, A.
The changes in concentration of thiamine, biotin and vitamin B sub(12) in water of the soaked bottles for 6 h in situ in the north basin of Lake Biwa were examined successively over 30 hours. The concentrations of the vitamins changed comparatively during 6 h. soaking in situ. Generally, the concentrations of thiamine, biotin and vitamin B sub(12) were in high levels in the morning and in low levels in evening both in the soaked bottles and in the surrounding water. The fluctuation ranges in concentration of vitamins in a 5 m deep layer were greater than those in thermocline. From the data obtained with the soaked bottles in situ, it was supposed that the decrease of vitamins in concentration during the daytime surpass consumption of vitamins by...
Tipo: Text
Palavras-chave: Phytoplankton; Microorganisms; Bacteria; Metabolism; Biological production; Vitamin B; Fresh water.
Ano: 1984
URL: http://archimer.ifremer.fr/doc/1984/acte-958.pdf

Phytoplancton des zones myticoles de la baie de Vilaine et intoxication par les coquillages.
Provedor de dados: 5
Autores: Andresen Leitao, Maria Da Paz; Lassus, Patrick; Maggi, Pierre; Le Baut, Claire; Chauvin, Jacky; Truouet, Philippe.
Following 1978 and 1981 human poisoning by mussels in Vilaine Bay (France) a survey of potentially toxic dinoflagellates was conducted in that area in 1982. At the same time paralytic shellfish poison (PSP) analyses were made, the authors studied the dinoflagellates encountered in the intestinal guts of mussels from January to August 1982. Results failed to demonstrate an occurrence of PSP producing species, either by toxicological analysis or dinoflagellate persistency in the mussel guts.
Tipo: Text
Palavras-chave: Mytilus edulis; Bivalvia; Marine mollusks; Stomach content; Toxicity; Phytoplankton; Biological poisons; Mussel culture.
Ano: 1982
URL: http://archimer.ifremer.fr/doc/1982/publication-1853.pdf

Temporal changes in the phytoplankton community along the French coast of the eastern English Channel and the southern Bight of the North Sea
Provedor de dados: 5
Autores: Hernandez- Farinas, Tania; Soudant, Dominique; Barille, Laurent; Belin, Catherine; Lefebvre, Alain; Bacher, Cedric.
Long-term trends in the phytoplankton community along the French coast of the English Channel and southern Bight of the North Sea were studied and related to physico-chemical factors and large-climatic indices. Phytoplankton and hydrological data were acquired through three transects. Sampling took place between 1992 and 2011 as part of the French Phytoplankton Monitoring Network (REPHY) and the Regional Nutrients Monitoring Network (SRN). Trends in time-series were identified with dynamic linear models tailored to environmental monitoring data characteristics (e.g. irregular sampling frequency, missing data). Temporal and spatial patterns in the phytoplankton community were explained with a partial triadic analysis. Relationships between the phytoplankton...
Tipo: Text
Palavras-chave: Climatic indicators; Dynamic linear model; Environmental drivers; Multivariate analysis; Phytoplankton.
Ano: 2014
URL: http://archimer.ifremer.fr/doc/00195/30619/32177.pdf

Résultats de la mise en oeuvre des réseaux REPHY et SRN – Zones côtières de la Manche orientale et de la baie sud de la Mer du Nord – Bilan de l’année 2016.
Provedor de dados: 5
Autores: Lefebvre, Alain; Ambiaud, Antonin.
The coastal zone of the Nord – Pas de Calais / Picardie showed dysfonctioning patterns of the ecosystem considered to be link to human activities along shores. These results in regular massive development of species, such as the phytoplanktonic seaweed, Phaeocystis sp. which life cycle was partly linked to nutrients availability and consequently to anthropogenic inputs. As part of the evaluation of the influence of continental inputs on the marine environment (nitrates, phosphates,…) and on potential eutrophication processes, of the estimation of the efficiency of the sewage treatments plants in the possible elimination of dumpings and in order to establish a long-term survey to follow up the change in coastal waters quality, the regional nutrients...
Tipo: Text
Palavras-chave: Manche Orientale; Baie sud de la Mer du Nord; Hydrologie; Phytoplancton; Phaeocystis globosa; Eastern English Channel – southern bight of the North Sea; Hydrology; Phytoplankton; Phaeocystis globosa.
Ano: 2017
URL: http://archimer.ifremer.fr/doc/00396/50746/51459.pdf

Dynamics of particulate organic matter delta N-15 and delta C-13 during spring phytoplankton blooms in a macrotidal ecosystem (Bay of Seine, France)
Provedor de dados: 5
Autores: Savoye, N; Aminot, Alain; Treguer, Paul; Fontugne, M; Naulet, N; Kerouel, Roger.
Two cruises (April and June 1997) were carried out in the Bay of Seine, a nitrate- and ammonium-enriched ecosystem of Western Europe, to identify the major mechanisms that control delta(15)N and VC in spring particulate organic matter (POM). Particulate organic nitrogen (PON) delta(15)N ranged between 0.8 and 5.2parts per thousand in April and between 2.2 and 6.2parts per thousand in June, while particulate organic carbon (POC) delta(13)C ranged between -24.3 and -19.7parts per thousand, and between -20.0 and -16.2parts per thousand during the same periods. During spring 1997, POM was highly dominated by autochthonous phytoplankton. It is shown that the variation of PON delta(15)N is due to both nitrate mixing between river and marine waters and...
Tipo: Text
Palavras-chave: C and N stable isotopes; Phytoplankton; Coastal ecosystem; Nitrate utilization; Bay of Seine.
Ano: 2003
URL: http://archimer.ifremer.fr/doc/00000/10645/7593.pdf

Evaluation de la qualité des eaux littorales de la France métropolitaine pour l'élément de qualité Phytoplancton dans le cadre de la DCE. Etat des lieux des règles d’évaluation, et résultats pour la période 2007‐2012. Tome 1 ‐ Etat des lieux, méthodes et synthèse des résultats
Provedor de dados: 5
Autores: Belin, Catherine; Lamoureux, Alice; Soudant, Dominique.
Ce rapport en deux tomes détaille les résultats de l’évaluation, avec les règles de la DCE (Directive Cadre sur l’Eau), de l’élément de qualité phytoplancton dans les masses d’eau de la France métropolitaine. Cette évaluation est réalisée à partir des données acquises sur la période 2007-2012. Le tome 1 contient également un état des lieux des grilles d’évaluation de l’indicateur phytoplancton qui sont applicables en 2014 pour les eaux littorales, et replace cette évaluation dans son contexte réglementaire, en rappelant les exigences de la DCE pour l’élément de qualité phytoplancton, et en donnant des informations sur l'historique et l’avancement des travaux d’inter-calibration et l’état des décisions au niveau européen. Il fait le point sur l’avancement...
Tipo: Text
Palavras-chave: DCE; Phytoplancton; Évaluation qualité; Masses d’eau; Métriques d’évaluation; Grilles d’évaluation; Valeurs de référence; WFD; Phytoplankton; Quality assessment; Water bodies; Evaluation metrics; Evaluation grids; Reference values.
Ano: 2014
URL: http://archimer.ifremer.fr/doc/00394/50490/51227.pdf

Application of a digital pattern recognition system to Dinophysis acuminata and D-sacculus complexes
Provedor de dados: 5
Autores: Truquet, Philippe; Lassus, Patrick; Honsell, Giorgio; Le Dean, Loic.
An image discrimination technique was developed to improve specific identification of some toxic Dinophysis cells (marine dinoflagellates involved in diarrhoeic shellfish poisoning), especially the ''acuminata'' and ''sacculus'' groups, which can be present at different ratios in natural sea-water samples collected during toxic episodes. This work was performed with image analysis software SAMBA (TITN Alcatel) using preserved cells directly observed through an inverted microscope and recorded with a video camera before further processing. All morphometric parameters used for discrimination of 7 different species or morphotypes of Dinophysis were tested with discriminant analysis. This study indicates that Dinophysis sp. and D. pavillardi seem well...
Tipo: Text
Palavras-chave: Dinophysis sp.; Analyse d'image; Taxonomie; Phytoplancton; Dinophysis sp; Image analysis; Taxonomy; Phytoplankton.
Ano: 1996
URL: http://archimer.ifremer.fr/doc/00188/29890/28337.pdf

Algal toxin profiles in Nigerian coastal waters (Gulf of Guinea) using passive sampling and liquid chromatography coupled to mass spectrometry
Provedor de dados: 5
Autores: Zendong, Suzie Zita; Kadiri, Medina; Herrenknecht, Christine; Nezan, Elisabeth; Mazzeo, Antonia; Hess, Philipp.
Algal toxins may accumulate in fish and shellfish and thus cause poisoning in consumers of seafood. Such toxins and the algae producing them are regularly surveyed in many countries, including Europe, North America, Japan and others. However, very little is known regards the occurrence of such algae and their toxins in most African countries. This paper reports on a survey of phytoplankton and algal toxins in Nigerian coastal waters.  Seawater samples were obtained from four sites for phytoplankton identification, on three occasions between the middle of October 2014 and the end of February 2015 (Bar Beach and Lekki in Lagos State, Port Harcourt in Rivers State and Uyo in Akwa Ibom State). The phytoplankton community was generally dominated by diatoms and...
Tipo: Text
Palavras-chave: Dinoflagellates; Dinophysis; Phycotoxins; Untargeted analysis; Phytoplankton.
Ano: 2016
URL: http://archimer.ifremer.fr/doc/00314/42521/41893.pdf

Similar patterns of patterns of community organization characterize distinct groups of different trophic levels in the plankton of the NW Mediterranean Sea
Provedor de dados: 5
Autores: Raybaud, V.; Tunin-ley, A.; Ritchie, M. E.; Dolan, J. R.
Planktonic populations were sampled over a 4 week period in the NW Mediterranean, at a site subject to little vertical advection during the Dynaproc 2 cruise in 2004. The characteristics of the phytoplankton, the tintinnid community and the zooplankton have recently been described in detail. Based on these studies, we compared the characteristics of 3 well-circumscribed assemblages of different trophic levels: Ceratium of the phytoplankton, herbivorous tintinnids of the microzooplankton, and large (&gt; 500 mu m) omnivorous and carnivorous copepods of the metazoan zooplankton. In all three groups, diversity as H' or species richness, was less variable than concentration of organisms. Plotting time against species accumulation, the curves approached plateau...
Tipo: Text
Palavras-chave: Species abundance distributions; Diversity; Zooplankton; Microzooplankton; Phytoplankton; Biodiversity.
Ano: 2009
URL: https://archimer.ifremer.fr/doc/00208/31970/30411.pdf

Phytoplankton Diversity in the Mediterranean Sea From Satellite Data Using Self-Organizing Maps
Provedor de dados: 5
Autores: El Hourany, Roy; Abboud-abi Saab, Marie; Faour, Ghaleb; Mejia, Carlos; Crepon, Michel; Thiria, Sylvie.
We present a new method to identify phytoplankton functional types (PFTs) in the Mediterranean Sea from ocean color data (GlobColour data in the present study) and AVHRR sea surface temperature. The principle of the method is constituted by two very fine clustering algorithms, one mapping the relationship between the satellite data and the pigments and the other between the pigments and the PFTs. The clustering algorithms are constituted of two efficient self-organizing maps, which are neural network classifiers. We were able to identify and estimate the percentage of six PFTs: haptophytes, chlorophytes, cryptophytes, Synechococcus, Prochlorococcus, and diatoms. We found that these PFTs present a peculiar variability due to the complex physical and...
Tipo: Text
Palavras-chave: Phytoplankton; Secondary phytoplankton pigments; Self-organizing maps; Classification; Mediterranean Sea; Remote sensing.
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00589/70145/68135.pdf

Impact of Contrasted Weather Conditions on CDOM Absorption/Fluorescence and Biogeochemistry in the Eastern Lagoon of New Caledonia
Provedor de dados: 5
Autores: Dupouy, Cécile; Röttgers, Rüdiger; Tedetti, Marc; Frouin, Robert; Lantoine, François; Rodier, Martine; Martias, Chloe; Goutx, Madeleine.
New Caledonia (Southwest Pacific), like all tropical Pacific Island countries, is impacted by weather events, climate change, and local anthropogenic forcing. Strong erosion of particles and dissolved organic matter (DOM) from ultramafic rocks, associated with trace metals dissemination (i.e., nickel, manganese and cobalt), potentially affects lagoon waters and coral reefs surrounding the main island. The CALIOPE (CALedonian Inherent Optical PropErties) cruises were performed along the Eastern Lagoon of New Caledonia (ELNC) (400 km, 13 transects from Bay to open ocean, 51 stations) during contrasted meteorological conditions: a dry period (October 2011), a windy situation (March 2014), and a strong rainy event (March 2016). CDOM absorption and fluorescence...
Tipo: Text
Palavras-chave: Chromophoric dissolved organic matter; Fluorescence; New Caledonia; Tropical Pacific; Lagoons; Biooptics; Phytoplankton; Rivers.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00620/73166/72352.pdf

Spatial variation in stable isotopes and fatty acid trophic markers in albacore tuna (Thunnus alalunga) from the western Indian Ocean
Provedor de dados: 5
Autores: Dhurmeea, Zahirah; Pethybridge, Heidi; Langlais, Clothilde; Somes, Christopher J.; Nikolic, Natacha; Bourjea, Jerome; Appadoo, Chandani; Bodin, Nathalie.
Albacore tuna (Thunnus alalunga) is a highly economically important species in the western Indian Ocean. However, knowledge of its ecological and nutritional characteristics, essential for proper management of the species, is lacking in the region. The trophodynamics of the Indian Ocean albacore was thus examined using known fatty acid trophic markers (FATMs) of primary producers, nutritional condition indices (NCIs) (omega-3/omega-6 ratio and total fatty acid content (TFA)), and baseline and lipid corrected stable isotope of carbon (δ13Ccorr) and nitrogen (δ15Ncorr), measured in the muscle tissue. We applied generalized additive mixed models to understand the spatiotemporal patterns and drivers of these tracers, taking into consideration several intrinsic...
Tipo: Text
Palavras-chave: Trophodynamics; Phytoplankton; Environmental parameters; Climate change.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00623/73497/72787.pdf

Premières propositions pour un indice de composition du phytoplancton, basé sur les résultats des méthodes pigments et diversité génétique. Action 3 - Indice Composition - Livrable 1. Rapport final, mars 2015.
Provedor de dados: 5
Autores: Siano, Raffaele; Delmas, Daniel; Lampert, Luis.
Tipo: Text
Palavras-chave: Phytoplancton; Pigments; Indice composition; Diversité pigmentaire; Metabarcoding; Picoplancton; Mamiellophyceae; Chlb; Golfe de Gascogne; Panache de la Gironde; Phytoplankton; Pigments; Composition index; Pigment diversity; Metabarcoding; Picoplankton; Mamiellophyceae; Chlb; Gulf of Biscay; River Gironde plume.
Ano: 2015
URL: http://archimer.ifremer.fr/doc/00361/47263/47228.pdf

Pyruvate kinase activity as index of carbohydrate assimilation by mesozooplankton: an early field implementation in the Bay of Biscay, NE Atlantic
Provedor de dados: 5
Autores: Bergeron, Jean-pierre; Herbland, Alain.
Estimates of carbohydrate assimilation within the mesozooplankton compartment are a fundamental concern in oceanography because they give a general expression of the biologically-regulated incorporation of metabolic fuel produced from inorganic nutrients by phytoplankton in the sea. A new tool is proposed for the assessment of such processes. It is based on the measurement of the activity of an enzyme, pyruvate kinase (PK), on samples of the whole mesozooplankton community. Here, the results are presented of an early attempt at such an implementation in the Bay of Biscay (north-east Atlantic) in springtime. A main area situated in front of an estuary (Gironde) has been extensively studied-the same sampling grid was covered on three occasions (two 20 day...
Tipo: Text
Palavras-chave: Bay of Biscay; Zooplankton; Phytoplankton; Pyruvate kinase; Carbohydrate.
Ano: 2001
URL: http://archimer.ifremer.fr/doc/2001/publication-452.pdf

Bilan des perturbations phytoplanctoniques observées sur les côtes françaises en 1986
Provedor de dados: 5
Autores: Belin, Catherine; Berthome, Jean-paul.
In 1986, 23 discolored waters were observed ; dinoflagellates often were the cause of them. Many developments of Prorocentrum minimum occured ; two of them were associated with shel1fishes mortalities. At contrary, other species which are suspected to be toxic for shellfishes, as Gyrodinium aureolum and Gyrodinium spirale, have not been associated with mortalities, although they have been observed in several areas.  The developments of Dinophysis (cf. acuminata or sacculus) caused provisional prohibitions of shellfishes selling, especially in the south of Brittany. Another specie was also implicated in toxicities : Prorocentrum lima. Human intoxications and economic consequences were rather important.
Tipo: Text
Palavras-chave: Phytoplancton; Toxicité; Surveillance; Santé publique; Mollusque; Phytoplankton; Toxicity; Survey; Public health; Mollusc.
Ano: 1988
URL: http://archimer.ifremer.fr/doc/00094/20541/18206.pdf

Maitrise de la culture de masse de la diatomée Skeletonema costatum en système ouvert et continu sur un milieu en "eau de mer"
Provedor de dados: 5
Autores: Brossard, Nicolas; Hussenot, Jerome.
Une culture extérieure en masse de la diatomée Skeletonema costatum, en système ouvert et continu, a été réalisée en automne 1996, au marais expérimental du CREMA I'Houmeau. Le but était d'apporter une nourriture complémentaire aux huîtres en période d'affinage.
Tipo: Text
Palavras-chave: Phytoplancton; Microalgues; Diatomées; Skeletonema costatum; Culture de masse; Culture continue; Affinage d'huîtres; Phytoplankton; Diatoms; Skeletonema costatum; Mass culture; Continuous culture; Oyster fattening.
Ano: 1997
URL: http://archimer.ifremer.fr/doc/00020/13117/10126.pdf

Nutrient and microbial dynamics in eutrophying shrimp ponds affected or unaffected by vibriosis
Provedor de dados: 5
Autores: Lemonnier, Hugues; Courties, Claude; Mugnier, Chantal; Torreton, Jean-pascal; Herbland, Alain.
A field survey was conducted on two intensive shrimp farms using similar technical practices: one (DF) historically affected by a vibriosis, the other (HC) in which the pathogen has been observed although no mortality event has occurred. Because historical data suggest that eutrophication process may directly or indirectly play a role in the disease outbreak, we focussed our research on its dynamics. A higher variability of the phytoplanktonic compartment linked to an imbalance in the molar N:P ratio was observed in farm DF compared to farm HC, implying a modification on the linkage between the bacteria and phytoplankton compartments at DF. The beginning of the mortality outbreak at DF followed a shift from picoto nanophytoplankton. The organic matter...
Tipo: Text
Palavras-chave: Aquaculture; Shrimp; Eutrophication; Ecosystem shift; Phytoplankton; Vibriosis.
Ano: 2010
URL: http://archimer.ifremer.fr/doc/00002/11368/8119.pdf

Explaining dinophysis cf. acuminata abundance in Antifer (Normandy, France) using dynamic linear regression
Provedor de dados: 5
Autores: Soudant, Dominique; Beliaeff, Benoit; Thomas, G.
Classical regression analysis can be used to model time series. However, the assumption that model parameters are constant over time is not necessarily adapted to the data. In phytoplankton ecology, the relevance of time-varying parameter values has been shown using a dynamic linear regression model (DLRM). DLRMs, belonging to the class of Bayesian dynamic models, assume the existence of a non-observable time series of model parameters, which are estimated on-line, i.e. after each observation. The aim of this paper was to show how DLRM results could be used to explain variation of a time series of phytoplankton abundance. We applied DLRM to daily concentrations of Dinophysis cf. acuminata, determined in Antifer harbour (French coast of the English...
Tipo: Text
Palavras-chave: Phytoplankton; Dinophysis; Time series; Regression; Dynamic; Bayesian.
Ano: 1997
URL: http://archimer.ifremer.fr/doc/00337/44784/44490.pdf

Abondance et composition du phytoplancton sur les lagunes méditerranéennes oligo et mésohalines
Provedor de dados: 5
Autores: Derolez, Valerie; Bec, Béatrice; Grillas, Patrice; Sanchez, Ana Elena; Raimbault, Patrick.
In the context of WFD implementation on Mediterranean lagoons, work has been carried out since 2010 by Ifremer, Tour du Valat and IRSTEA (Onema and AERM &amp; C fundings), to assess the relevance of macrophytes and macrofauna indicators for oligohaline and mesohaline lagoons (mean salinity &lt;18 PSU). The question of the relevance of indicator metrics and thresholds for the "phytoplankton" biological quality element also arises, especially due to the confined nature of olgo-mesohaline lagoons. The objective of this study is to characterize the abundance and composition of phytoplankton on 5 oligo and mesohaline lagoons of the French Mediterranean coast (Scamandre, Crey, Charnier, Bolmon and Grand Palun). Analyses of accessory pigments (chlorophyll and...
Tipo: Text
Palavras-chave: Lagunes; Méditerranée; Oligohalin; Mésohalin; Phytoplancton; Cytométrie; Pigments chlorophylliens; Lagoons; Mediterranean Sea; Oligohaline; Mesohaline; Phytoplankton; Cytometry; Chlorophyll pigments.
Ano: 2014
URL: http://archimer.ifremer.fr/doc/00357/46816/46682.pdf

Phytoplankton production in the Tagus estuary (Portugal)
Provedor de dados: 5
Autores: Cabecadas, L.
Biomass and phytoplankton photosynthetic response were studied in the lower Tagus estuary weekly, and related to environmental conditions in February, March and April 1994. The Photosynthesis-Irradiance ((P-I)-I-B) relation was studied based on the light-saturated photosynthesis rate (P(B)m) and the light-limited initial slope (a(B)). The nutrient concentrations observed were high enough to be considered as not limiting phytoplankton growth. Tagus estuary phytoplankton seems, to a certain extent, adapted to high turbid conditions, being able to utilize the low light levels more efficiently, which was translated by high values of a(B) [0.10-0.20 mg C (mg Chl a)(-1) h(-1) (W m(-2))(-1)]; however, light seems to limit phytoplankton production in the water...
Tipo: Text
Palavras-chave: Production primaire; Phytoplancton; Estuaire; Biomasse; Turbidité; Primary production; Phytoplankton; Estuary; Biomass; Turbidity.
Ano: 1999
URL: http://archimer.ifremer.fr/doc/00325/43621/43310.pdf

Phytoplankton versus macrophyte contribution to primary production and biogeochemical cycles of a coastal mesotidal system. A modelling approach
Provedor de dados: 5
Autores: Plus, Martin; Auby, Isabelle; Maurer, Daniele; Trut, Gilles; Del Amo, Y.; Dumas, Franck; Thouvenin, Benedicte.
This study presents an assessment of the contributions of various primary producers to the global annual production and N/P cycles of a coastal system, namely the Arcachon Bay, by means of a numerical model. This 3D model fully couples hydrodynamic with ecological processes and simulates nitrogen, silicon and phosphorus cycles as well as phytoplankton, macroalgae and seagrasses. Total annual production rates for the different components were calculated for different years (2005, 2007 and 2009) during a time period of drastic reduction in seagrass beds since 2005. The total demand of nitrogen and phosphorus was also calculated and discussed with regards to the riverine inputs. Moreover, this study presents the first estimation of particulate organic carbon...
Tipo: Text
Palavras-chave: Primary production; Macrophyte; Phytoplankton; Biogeochemical cycle; Physical-ecological coupled model; Arcachon bay.
Ano: 2015
URL: http://archimer.ifremer.fr/doc/00278/38963/37503.pdf

New insights into the seasonal feeding ecology of Pecten maximus using pigments, fatty acids and sterols analyses
Provedor de dados: 5
Autores: Lavaud, Romain; Artigaud, Sebastien; Le Grand, Fabienne; Donval, Anne; Soudant, Philippe; Flye-sainte-marie, Jonathan; Strohmeier, Tore; Strand, Oivind; Leynaert, Aude; Beker, Beatriz; Chatterjee, Arnab; Jean, Fred.
We combined the use of pigments, fatty acids and sterols as biomarkers of the seasonal variation in food sources of the great scallop Pecten maximus. From March to October 2011, on a biweekly to twice-weekly basis, scallops and seawater from the water column and the water-sediment interface were collected in the Bay of Brest (Brittany, France). Pigment compositions in the seawater and in the stomach and rectum content of the scallops were analyzed by HPLC. Fatty acids and sterols from digestive gland (DG) tissue were analyzed by gas chromatography. Potential relationships between the temporal proportion of each marker in the environment and in the digestive tract were tested using multivariate analysis. Proportions of diatoms and Dinophyceae biomarkers...
Tipo: Text
Palavras-chave: Trophic ecology; Food sources; Pigments; Fatty acids; Trophic marker; Phytoplankton; Pecten maximus.
Ano: 2018
URL: https://archimer.ifremer.fr/doc/00431/54244/55772.pdf

Utilisation conjointe de FlowCAM / ZooPhytoImage et de la cytométrie en flux. Premiers résultats et perspectives. Action 9. FlowCam ZooPhytoImage. Livrable n° 4. Rapport final, 23 septembre 2014
Provedor de dados: 5
Autores: Ali, Nour; Wacquet, Guillaume; Didry, Morgane; Hamad, Denis; Artigas, Luis Felipe; Grosjean, Philippe.
The goal of this study is to investigate about the possibility of coupling measurements made by image analysis from the FlowCAM with Zoo/PhytoImage with data obtained with a flux cytometer (pulse-shape-recording Scanning Flow Cytometry) on the same samples gathered in current monitoring networks in the eastern Channel and southern North Sea. In this preliminary study, we collected a series of samples off Boulogne-sur-Mer (SRN-REPHY monitoring system run by IFREMER) and along a transect in the Baie St-Jean (Wimereux-Slack) run by LOG. All these samples were digitized with a FlowCAM and measured with a scanning flow cytometer (CytoSense). The complete analysis with the FlowCAM and Zoo/PhytoImage is detailed in the present report. In order to get a better...
Tipo: Text
Palavras-chave: Manche – Mer du Nord; Phytoplancton; Analyse d'image; Classification supervisée; Cytométrie en flux; Eastern English Channel and southern North Sea; Phytoplankton; Image analysis; Machine learning; Scanning Flow Cytometry.
Ano: 2014
URL: http://archimer.ifremer.fr/doc/00363/47442/47470.pdf

Pheopigment dynamics, zooplankton grazing rates and the autumnal ammonium peak in a Mediterranean lagoon
Provedor de dados: 5
Autores: Collos, Yves; Husseini Ratrema, Julie; Bec, Béatrice; Vaquer, André; Hoai, Thong Lam; Rougier, Claude; Pons, Virginie; Souchu, Philippe.
The dilution technique was used to estimate chlorophyll and pheopigment, net and gross production as well as zooplankton grazing over a 12-month period in a coastal lagoon in Southern France. Chlorophyll a (Cha) based gross growth rates of phytoplankton ranged from undetectable in February to 2.6 day(-1) in June, corresponding to 3.8 divisions per day. Cha-based grazing rates ranged from undetectable in February to 1.1 d(-1) in June. The seasonal growth pattern of picoplankton was similar to that of the whole community, with a peak in July, corresponding to four divisions per day. Grazing processes represented from 20 to 150% of the phytoplankton daily growth, and the grazing pressure was stronger on small phytoplankton cells than on larger cells. Gross...
Tipo: Text
Palavras-chave: Zooplankton; Ammonium; Pheopigments; Degradation; Growth; Phytoplankton.
Ano: 2005
URL: http://archimer.ifremer.fr/doc/2005/publication-727.pdf

Trophic relationships between benthic or planktonic microphytes and infaunal bivalve molluscs
Provedor de dados: 5
Autores: Plantecuny, M; Bodoy, Alain.
In order to estimate energetic relationship, microphytic and benthic bivalve levels of a shallow (1.5 m), sandy ecosystem near Marseille (Gulf of Fos, Southern France) were sampled monthly during 1.5 year, in two sites differing by their wave exposure. In the sheltered area, the bivalve Ruditapes decussatus was the dominant species, while another bivalve, Donax trunculus , was found in the open, wave exposed site. Chlorophyll a and primary production of the phytoplankton and the microphytobenthos, as well as population dynamic, growth and biochemical composition of bivalves (lipids, proteins and carbohydrates) were monitored.
Tipo: Text
Palavras-chave: Ruditapes decussatus; Bivalvia; Periphyton; Phytoplankton; Biochemical composition; Growth; Marine molluscs; Hydrodynamics; Seasonal variations; Primary production; Trophic relationships.
Ano: 1984
URL: http://archimer.ifremer.fr/doc/1984/acte-1528.pdf

The role of microalgae in aquaculture: situation and trends
Provedor de dados: 5
Autores: Muller-feuga, Arnaud.
Algae are utilized diversely in aquaculture, but their main applications are related to nutrition. They are used in toto, as a sole component or as a food additive to supply basic nutrients, color the flesh of salmonids or for other biological activities. The need for nutritional sources safer than traditional animal products has renewed interest in plants in general and algae in particular. This report deals principally with the nutritional role of microalgae in aquaculture.The larvae of molluscs, echinoderms and crustaceans as well as the live prey of some fish larvae feed on microalgae. Though attempts have been made to substitute inert particles for these micro-organisms which are difficult to produce, concentrate and store, only shrimp and live prey...
Tipo: Text
Palavras-chave: Shrimp; Post larvae; Phytoplankton; Molluscs; Microalgae; Hatchery; Fish; Aquaculture.
Ano: 2000
URL: http://archimer.ifremer.fr/doc/2000/publication-497.pdf

Influence of shellfish farming activities on the biogeochemical composition of the water column in Thau lagoon
Provedor de dados: 5
Autores: Souchu, Philippe; Vaquer A, André; Collos, Yves; Landrein, Sonia; Deslous-paoli, Jean-marc; Bibent, Bertrand.
Thau lagoon is a Mediterranean shellfish ecosystem with large biomasses of oysters growing in waters with high residence time due to low tidal ranges, The influence of filter feeders (oysters and their epibiota) on the spatial distribution of particulate and dissolved compounds in the water column of Thau lagoon was studied through its variation with time, In 1991/1992, daily variations were investigated in pens, corridors and outside shellfish farming zones for nutrients, chlorophyll a and primary production. Salinity, dissolved oxygen, nutrients, organic matter and chlorophyll a were also monitored in surface waters inside and outside shellfish farming zones each week from January 1993 to March 1994. The presence of shellfish farms led to a decrease by...
Tipo: Text
Palavras-chave: Thau lagoon; Carrying capacity; Nutrient cycling; Phytoplankton; Suspension feeding bivalves.
Ano: 2001
URL: http://archimer.ifremer.fr/doc/2001/publication-808.pdf

La surveillance des phycotoxines dans les coquillages du milieu marin. Le réseau REPHY : objectifs, stratégies, et principaux résultats
Provedor de dados: 5
Autores: Belin, Catherine.
The surveillance of phycotoxins in marine shellfish. The REPHY network: objectives, strategies and primary results One of the objectives of REPHY (network for phytoplankton and phycotoxin surveillance) is to monitor toxin-producing micro-algae species in the marine environment that are likely to accumulate in seafood products, and to screen for these toxins in shellfish. This surveillance is undertaken in the framework of the European regulations. Three groups of toxins are thus monitored and are associated with three genera of toxic phytoplankton: (i) Dinophysis, a producer of the okadaic acid (with diarrhoeic effects) and pectenotoxin families of toxins; in the same group of so-called “lipophilic toxins”, two other families of regulated toxins are...
Tipo: Text
Palavras-chave: Santé; Surveillance; Phytoplancton; Phycotoxines; Coquillages; Milieu marin; Health; Surveillance; Phytoplankton; Phycotoxins; Shellfish; Marine environment.
Ano: 2011
URL: http://archimer.ifremer.fr/doc/00449/56089/57623.pdf

Validation de l’indice composition IC Medit pour les eaux côtières de Corse et de la région PACA. Action 3. Indice Composition. Livrable n° B. Rapport final, juillet 2014.
Provedor de dados: 5
Autores: Goffart, Anne; Andral, Bruno.
The aim of this study is to show the current status of the development and use of the new IC Medit phytoplankton composition index as a sub-metric within the phytoplankton quality element in assessing phytoplankton quality in Mediterranean coastal waters. IC Medit uses pigment concentrations determined by HPLC for assessing phytoplankton composition. Focusing on coastal waters of Corsica, we (i) described the seasonal succession of the main phytoplankton groups in reference conditions, (ii) studied responses of phytoplankton groups to well identified drivers, (iii) assessed the shift of the seasonal succession of phytoplankton groups from the reference conditions in impacted areas, (iv) revealed pressure / impact relationships between nutrients and...
Tipo: Text
Palavras-chave: Phytoplancton; Indicateur de composition; Pigments; IC Medit; Relations pressions / impacts; Conditions de référence; Méditerranée; Corse; DCE; Phytoplankton; Indicator of community composition; Pigments; IC Medit; Pressure impact relationships; Reference conditions; Mediterranean Sea; Corsica; Water Framework Directive.
Ano: 2014
URL: http://archimer.ifremer.fr/doc/00361/47261/47226.pdf

Seston, phytoplancton et microphytobenthos en rivière d'Auray. Leur role dans le cycle biologique des huitres (Oystrea edulis L.)
Provedor de dados: 5
Autores: Paulmier, Gerard.
Tipo: Text
Palavras-chave: Seston; Phytoplankton; Nutrition; Oyster culture.
Ano: 1972
URL: http://archimer.ifremer.fr/doc/1972/publication-2236.pdf

Interactions between polystyrene microplastics and marine phytoplankton lead to species-specific hetero-aggregation
Provedor de dados: 5
Autores: Long, Marc; Paul-pont, Ika; Hegaret, Helene; Moriceau, Brivaela; Lambert, Christophe; Huvet, Arnaud; Soudant, Philippe.
To understand the fate and impacts of microplastics (MP) in the marine ecosystems, it is essential to investigate their interactions with phytoplankton as these may affect MP bioavailability to marine organisms as well as their fate in the water column. However, the behaviour of MP with marine phytoplanktonic cells remains little studied and thus unpredictable. The present study assessed the potential for phytoplankton cells to form hetero-aggregates with small micro-polystyrene (micro-PS) particles depending on microalgal species and physiological status. A prymnesiophycea, Tisochrysis lutea, a dinoflagellate, Heterocapsa triquetra, and a diatom, Chaetoceros neogracile, were exposed to micro-PS (2 μm diameter; 3.96 μg L−1) during their growth culture...
Tipo: Text
Palavras-chave: Polystyrene; Microplastic; Aggregates; Microalgae; Marine; Phytoplankton.
Ano: 2017
URL: https://archimer.ifremer.fr/doc/00389/50016/50735.pdf

Résultats de la mise en oeuvre des réseaux REPHY (Réseau Phytoplancton et Phycotoxines) et SRN (Suivi Régional des Nutriments). Zones côtières de la Manche orientale et de la baie sud de la Mer du Nord. Bilan de l'année 2017
Provedor de dados: 5
Autores: Lefebvre, Alain; Dussuel, Antoine.
The coastal zone of the Nord – Pas de Calais / Picardie showed dysfonctioning patterns of the ecosystem considered to be link to human activities along shores. These results in regular massive development of species, such as the phytoplanktonic seaweed, Phaeocystis sp. which life cycle was partly linked to nutrients availability and consequently to anthropogenic inputs. As part of the evaluation of the influence of continental inputs on the marine environment (nitrates, phosphates,…) and on potential eutrophication processes, of the estimation of the efficiency of the sewage treatments plants in the possible elimination of dumpings and in order to establish a long-term survey to follow up the change in coastal waters quality, the regional nutrients...
Tipo: Text
Palavras-chave: Manche Orientale; Baie sud de la Mer du Nord; Hydrologie; Phytoplancton; Phaeocystis globosa; Eastern English Channel; Hydrology; Phytoplankton; Phaeocystis globosa; Southern bight of the North Sea.
Ano: 2018
URL: https://archimer.ifremer.fr/doc/00448/55949/57429.pdf

Mesoscale surface distribution of biogeochemical characteristics in the Crozet Basin frontal zones (South Indian Ocean)
Provedor de dados: 5
Autores: Fiala, M; Delille, B; Dubreuil, C; Kopczynska, E; Leblanc, K; Morvan, J; Queguiner, B; Blain, S; Cailliau, C; Conan, P; Corvaisier, R; Denis, M; Frankignoulle, M; Oriol, L; Roy, S.
A mesoscale study was conducted in January and February 1999 in the Crozet Basin frontal zones (43degrees50' to 45degrees20'S, 61degrees00' to 64degrees30'E) within the southernmost and easternmost convergence area of the Antarctic Circumpolar Current (ACC) and the Agulhas Return Current (ARC). Distribution of biogeochemical parameters was strongly linked to the merged Subtropical (STF) and Subantarctic (SAF) Fronts which mark the border between the cold and less saline subantarctic waters and the warm and more saline subtropical waters. This survey took place during a post-bloom period. Chlorophyll a concentrations were low throughout the study area ranging from 0.2 mug l(-1) in the Polar Frontal Zone (PFZ) to 0.4 mug l(-1) in the Subtropical Zone (STZ)....
Tipo: Text
Palavras-chave: Frontal zones; Nutrients; Biogenic silica; Chlorophyll a; PCO(2); Phytoplankton; Bacteria.
Ano: 2003
URL: https://archimer.ifremer.fr/doc/00224/33557/31968.pdf

Effect of local hydroclimate on phytoplankton groups in the Charente estuary
Provedor de dados: 5
Autores: Guesdon, Stephane; Stachowski-haberkorn, Sabine; Lambert, Christophe; Beker, Beatriz; Brach-papa, Christophe; Auger, Dominique; Bechemin, Christian.
This study aimed to describe seasonal variations of phytoplankton abundances in relation to the physical and chemical (nutrients and metals) environment under the influence of freshwater input in the Charente river estuary (Marennes-Oléron bay, France) over three years, from 2011 to 2014. Phytoplankton abundances were determined using microscopy and flow cytometry. Considering high frequency temperature and salinity data, breakpoints in each series led to the identification of two local hydroclimatic periods: the first (2011 and early 2012) being warmer and higher in salinity than the second (from spring 2012 to the beginning of 2014). A multiblock PLS analysis highlighted the significant contribution of the physical environment (temperature, salinity and...
Tipo: Text
Palavras-chave: Hydroclimate; Estuary; Phytoplankton; Size composition; Nutrients; Trace metals.
Ano: 2016
URL: https://archimer.ifremer.fr/doc/00349/46005/45674.pdf

Restoration ecology of coastal lagoons: new methods for the prediction of ecological trajectories and economic valuation
Provedor de dados: 5
Autores: De Wit, Rutger; Rey-valette, Helene; Balavoine, Juliette; Ouisse, Vincent; Lifran, Robert.
Conservation of the seven lagoons of the Palavas complex (southern France) has been severely impaired by nutrient over-enrichment during at least four decades. The effluents of the Montpellier wastewater treatment plant (WWTP) represented the main nutrient input. To improve the water quality of these lagoons, this WWTP was renovated and upgraded and, since the end of 2005, its effluents have been discharged 11 km offshore into the Mediterranean (total investment €150 M).   Possibilities of ecosystem restoration as part of a conservation programme were explored by a focus group of experts. Their tasks were: (i) to evaluate the impact of the reduction of the nutrient input; (ii) if necessary, to design additional measures for an active restoration programme;...
Tipo: Text
Palavras-chave: Coastal lagoon; Seagrass meadow; Marine and brackish Magnoliophyta; Phytoplankton; Ecosystem services; Willingness to pay (WTP); Ecosystem trajectory' nutrient enrichment; Oligotrophication; Sediment N and P contents; Water Framework Directive.
Ano: 2017
URL: https://archimer.ifremer.fr/doc/00317/42867/42368.pdf

Spatial and long-term changes in the functional and structural phytoplankton communities along the French Atlantic coast
Provedor de dados: 5
Autores: David, Valerie; Ryckaert, Mireille; Karpytchev, Mikhail; Bacher, Cedric; Arnaudeau, Vanessa; Vidal, Nadia; Maurer, Daniele; Niquil, Nathalie.
Spatial and interannual variations of phytoplankton diversity were characterized along the French Atlantic Coast in relation to physical factors and large-scale climatic indices using phytoplankton surveys conducted from 1993 to 2010 in four geographical areas. This study relates phytoplankton diversity to oyster recruitment success by comparing a 'specific' versus a 'functional' diversity approach. Functional diversity was represented by functional groups of different phytoplanktonic functional traits (size, shape, toxicity), relevant for oyster feeding during growth, reproduction and larval development. Phytoplankton diversity patterns along the French Atlantic coast corresponded to a geographical distribution mainly driven by a latitudinal gradient and...
Tipo: Text
Palavras-chave: Phytoplankton; Long-term variation; Spatial variation; Climate; Atlantic coast.
Ano: 2012
URL: http://archimer.ifremer.fr/doc/00093/20376/19677.pdf

First report of the potentially toxic marine diatom Pseudo-nitzschia simulans (Bacillariophyceae) from the East Australian Current
Provedor de dados: 5
Autores: Ajani, Penelope A.; Lim, Hong Chang; Verma, Arjun; Lassudrie, Malwenn; Mcbean, Katie; Doblin, Martina A.; Murray, Shauna A.
Certain species of the marine diatom genus Pseudo‐nitzschia are responsible for the production of the domoic acid (DA), a neurotoxin that can bioaccumulate in the food chain and cause amnesic shellfish poisoning (ASP) in animals and humans. This study extends our knowledge by reporting on the first observation of the potentially toxic species Pseudo‐nitzschia simulans from this region. One clonal strain of P. simulans was isolated from the East Australian Current and characterized using light and transmission electron microscopy, and phylogenetic analyses based on regions of the internal transcribed spacer (ITS) and the D1–D3 region of the large subunit (LSU) of the nuclear‐encoded ribosomal deoxyribonucleic acid (rDNA), as well as examined for DA...
Tipo: Text
Palavras-chave: Domoic acid; East Australian current; Harmful algal blooms; Phytoplankton; Shellfish.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00618/73047/75313.pdf

Vigilance, veille et surveillance des risques alimentaires phycotoxiniques
Provedor de dados: 5
Autores: Grastilleur, Charlotte; Arnich, Nathalie; Belin, Catherine.
Official routine monitoring of phycotoxins and toxinproducing algae is regularly implemented in the marine environment through phytoplankton identification in water samples, as well as by official analysis in shellfish in order to verify compliance with the maximum limits set in regulation (EC) no.853/2004. These activities are conducted by the official REPHY network, coordinated by IFREMER (French Research Institute for Exploitation of the Sea). As for other food safety hazards, the issue of emerging and non-regulated hazards needs to be fully addressed in addition to the ongoing above-mentioned surveillance efforts. This issue was submitted to ANSES (French Agency for Food, Environmental and Occupational Health &amp; Safety) in the surveillance framework...
Tipo: Text
Palavras-chave: Phytoplancton; Phycotoxines; Biotoxines marines; Alexandrium; Dinophysis; Pseudo-nitzschia; ASP; DSP; PSP; Surveillance des aliments; Veille alimentaire; Sécurité sanitaire des aliments; Coquillages; Phytoplankton; Phycotoxins; Marine biotoxins; Alexandrium; Dinophysis; Pseudo-nitzschia; ASP; DSP; PSP; Food monitoring; Food surveillance; Food safety; Shellfish.
Ano: 2015
URL: http://archimer.ifremer.fr/doc/00393/50471/51206.pdf

Les chaines alimentaires naturelles et l'aquaculture
Provedor de dados: 5
Autores: Barnabe, G.
Aquaculture sets up manipulation of natural food chains. This paper describes some utilizations of photosynthetic bacteria, phytoplankton and zooplankton taken out sewage ponds, wetlands or neritic waters.
Tipo: Text
Palavras-chave: Bacteria; Photosynthesis; Aquaculture; Ecosystems; Zooplankton; Phytoplankton; Food chains.
Ano: 1983
URL: http://archimer.ifremer.fr/doc/1983/acte-1254.pdf

Harmful Algal Blooms (HABs) and Black Mussel Mytilus galloprovincialis (Linnaeus, 1758) Culture in Izmir Bay (Iskele-Urla)-Turkey: Preliminary Results on the Annual Feeding Cycle Using a Qualitative Approach
Provedor de dados: 5
Autores: Lok, Aynur; Metin, Gulnur; Acarli, Sefa; Goulletquer, Philippe.
Considering the filtration capacity of mussels to qualitative particle selection, our study focused directly on ingested species by assessing mussel stomach content of various size classes (1-5 cm) over a year (August 97-June 98) rather than monitoring seawater samples. Different size of mussels (1, 2, 3, 4, 5 cm in length) was sampled monthly from the sides of fish cage floats in Urla-Izmir. Stomach contents were analyzed under microscope and different plankton species were grouped taxonomically. Bacillariophycea, Dinophyceae, Oxyphceae, Euglenophyceae as phytoplanktonic species were observed in the stomach contents of mussels as well as zooplanktonic species including Ciliata, Cladocera, Copepod, bivalve and gastropod larvae. Over the sampling period,...
Tipo: Text
Palavras-chave: Mussel; Mytilus galloprovincialis; Harmful; Phytoplankton; Stomach content; Aegean Sea.
Ano: 2010
URL: http://archimer.ifremer.fr/doc/00032/14329/11621.pdf

Satellite and in situ observations of a late winter phytoplankton bloom, in the northern Bay of Biscay
Provedor de dados: 5
Autores: Gohin, Francis; Lampert, Luis; Guillaud, Jean-francois; Herbland, Alain; Nezan, Elisabeth.
A phytoplankton bloom was observed in late winter 2000, on the continental shelf offshore of southern Brittany, in northwestern Bay of Biscay. This bloom appeared initially along the 120-m isobath, in stratified and clear waters, at the interface between the oceanic water and the plumes of southern Brittany rivers (mainly the Loire and Vilaine). The development of the bloom was triggered by favourable meteorological conditions, characterised by solar irradiance reaching the maximum level expected for that period of the year. Outside of the bloom area, the phytoplankton photosynthesis was irradiance limited: inshore, because of the stronger attenuation of the light; offshore, because of the weak stratification. The hydrological conditions at the onset of...
Tipo: Text
Palavras-chave: Bay of Biscay; Coscinodiscus; Algal bloom; Phytoplankton; Ocean colour; Satellite sensing.
Ano: 2003
URL: http://archimer.ifremer.fr/doc/2003/publication-463.pdf

Résultats de la mise en oeuvre des réseaux REPHY et SRN. Zones côtières de la Manche orientale et de la baie sud de la Mer du Nord. Bilan de l'année 2018
Provedor de dados: 5
Autores: Clabaut, Thomas; Devreker, David; Lefebvre, Alain.
The coastal zone of the Nord – Pas-de-Calais / Picardie showed dysfonctioning patterns of the ecosystem considered to be link to human activities along shores. These results in regular massive development of species, such as the phytoplanktonic seaweed, Phaeocystis sp. which life cycle was partly linked to nutrients availability and consequently to anthropogenic inputs. As part of the evaluation of the influence of continental inputs on the marine environment (nitrates, phosphates,…) and on potential eutrophication processes, of the estimation of the efficiency of the sewage treatments plants in the possible elimination of dumpings and in order to establish a long-term survey to follow up the change in coastal waters quality, the regional nutrients...
Tipo: Text
Palavras-chave: Manche Orientale; Baie sud de la Mer du Nord; Hydrologie; Phytoplancton; Phaeocystis globosa; Eastern English Channel; Hydrology; Phytoplankton; Phaeocystis globosa; Southern bight of the North Sea.
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00506/61790/65793.pdf

Etude des conséquences du fonctionnement de la centrale de Gravelines sur le milieu marin 1986
Provedor de dados: 5
Autores: Gentien, Patrick; Gros, Philippe; Le Fevre-lehoerff, Geneviève.
Une étude de rejet d'eau chaude (chlorée) du Centre de Production nucléaire a été effectuée selon deux méthodologies.
Tipo: Text
Palavras-chave: Centrale nucléaire; Gravelines; Impact; Dilution; Phytoplancton; Sonar; Nuclear power plant; Gravelines; Impact; Dilution; Phytoplankton; Sonar.
Ano: 1986
URL: http://archimer.ifremer.fr/doc/00006/11722/8391.pdf

Essai d'aptitude par comparaison Inter-analystes pour l'évaluation des performances en identification et dénombrement du phytoplancton marin. Rapport d'évaluation compétences des analystes du phytoplancton dans le cadre du réseau d'observation et de surveillance du phytoplancton et de l'hydrologie (REPHY) mis en œuvre par l'Ifremer. Exercice 2019
Provedor de dados: 5
Autores: Neaud-masson, Nadine; Brun, Melanie.
The determination of phytoplankton species and the estimation of their abundance in the context of the Phytoplankton and Hydrology Monitoring and Surveillance Network, implemented by Ifremer (REPHY), are based in 2019 on 24 analysts spread over 12 sites. Proficiency testing by inter-laboratory or inter-analyst comparison is used to evaluate the performance of laboratories or analysts on specific skills. An International Phytoplankton Inter-comparison (IPI) is organized annually by the Marine Institute Phytoplankton unit of Galway (Ireland), to evaluate marine phytoplankton identification and enumeration performance. The IPI is implementing its inter-comparison exercises through the Marine Institute Ireland in cooperation with the Intergovernmental...
Tipo: Text
Palavras-chave: Phytoplancton; Comparaison Inter-Laboratoire; CIL; Comparaison Inter-Analyste; CIA; Essai d’aptitude; Phytoplankton; Inter-Laboratory Comparison; ILC; Inter-Analyst Comparison; IAC; Aptitude Test; International Phytoplankton Inter-comparison; IPI.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00665/77674/79744.pdf

Variability and seasonality of physical and biological fields at the Great Meteor Tablemount (subtropical NE Atlantic)
Provedor de dados: 5
Autores: Mourino, B; Fernandez, E; Serret, P; Harbour, D; Sinha, B; Pingree, R.
Five oceanographic surveys were conducted at the Great Meteor Tablemount (subtropical NE Atlantic; 30.0 degreesN, 28.5 degreesW) throughout the 1992-1999 period tc, investigate temporal variability in the relationship between the physical structure of the water column associated with the seamount and phytoplankton biomass and/or production rates. Local increases in chlorophyll a, enhanced carbon incorporation rates and changes in phytoplankton species composition were associated with the seamount. These effects were subjected to a large degree of temporal and spatial variability both at seasonal and shorter time scales.
Tipo: Text
Palavras-chave: Variabilité physique; Phytoplancton; Production primaire; Mont sous-marin; Atlantique subtropical; Physical variability; Phytoplankton; Primary production; Seamount; Subtropical Atlantic.
Ano: 2001
URL: http://archimer.ifremer.fr/doc/00322/43362/42853.pdf

Oyster Farming, Temperature, and Plankton Influence the Dynamics of Pathogenic Vibrios in the Thau Lagoon
Provedor de dados: 5
Autores: Lopez-joven, Maria-carmen; Rolland, Jean-luc; Haffner, Philippe; Caro, Audrey; Roques, Cecile; Carre, Claire; Travers, Marie-agnes; Abadie, Eric; Laabir, Mohamed; Bonnet, Delphine; Destoumieux-garzon, Delphine.
Vibrio species have been associated with recurrent mass mortalities of juvenile oysters Crassostrea gigas threatening oyster farming worldwide. However, knowledge of the ecology of pathogens in affected oyster farming areas remains scarce. Specifically, there are no data regarding (i) the environmental reservoirs of Vibrio populations pathogenic to oysters, (ii) the environmental factors favoring their transmission, and (iii) the influence of oyster farming on the persistence of those pathogens. This knowledge gap limits our capacity to predict and mitigate disease occurrence. To address these issues, we monitored Vibrio species potentially pathogenic to C. gigas in 2013 and 2014 in the Thau Lagoon, a major oyster farming region in the coastal French...
Tipo: Text
Palavras-chave: Vibrio; Shellfish farming; Bivalve mollusks; Mortality outbreak; Phytoplankton; Zooplankton.
Ano: 2018
URL: https://archimer.ifremer.fr/doc/00463/57479/59598.pdf

Modeling continuous cultures of microalgae colimited by nitrogen and phosphorus
Provedor de dados: 5
Autores: Bougaran, Gael; Bernard, Olivier; Sciandra, Antoine.
It is well documented that the combination of low nitrogen and phosphorus resources can lead to situations where colimitation of phytoplankton growth arises, yet the underlying mechanisms are not fully understood. Here, we propose a Droop-based model built on the idea that colimitation by nitrogen and phosphorus arises from the uptake of nitrogen. Indeed, since N-porters are active systems, they require energy that could be related to the phosphorus status of the cell. Therefore, we assumed that N uptake is enhanced by the P quota. Our model also accounts for the biological observations that uptake of a nutrient can be down-regulated by its own internal quota, and succeeds in describing the strong contrast for the non-limiting quotas under N-limited and...
Tipo: Text
Palavras-chave: Colimitation; Phytoplankton; Mathematical model; Quota.
Ano: 2010
URL: http://archimer.ifremer.fr/doc/00011/12216/9060.pdf

Evolution de communautés phytoplanctoniques après fertilisation modérée
Provedor de dados: 5
Autores: Jacques, G.; De Billy, G.
One approach to the problem of aquaculture consists in a simple acceleration of natural processes in extended areas of salt or brackish water. From this point of view, the authors have been in­terested in the effect of moderate fertilization on natural communi­ties . A first series of experiments (8) was made in an exter­nal tank of 3000 liters. After fertilization, the development of flowering diatoms was obtained each time. The time of latency, the level of production reached, the composition of the final communities is to some extent variable, but bacterial development may be neglec­ted. In contrast to earlier results, obtained in small volumes of water, these experiments have always led to simplified communities mostly dominated by the diatom...
Tipo: Text
Palavras-chave: Phytoplancton; Fertilisation; Chémostat.; Phytoplankton; Nutrient; Enrichment; Chemostat.
Ano: 1979
URL: http://archimer.ifremer.fr/doc/00306/41688/40897.pdf

A Physiologically Structured Equation to Consider Quota Heterogeneity in the Droop Model
Provedor de dados: 5
Autores: Mairet, Francis; Baron, Regis.
The Droop model allows to represent microalgae growth limited by a nutrient, using a cell quota (also referred to as variable-yield) approach. Single-cell measurements have revealed quota heterogeneity in phytoplankton collected from field studies. Such heterogeneity can be due, among other factors, to spatial structure (e.g. in biogeochemical cycles in the ocean, or for photobioreactors connected in series). Nonetheless, quota heterogeneity is generally omitted in modelling studies, using an average quota approach, or included in size-structured or individual-based models. Here, we propose a distributed Droop equation to tackle this problem, considering subpopulation growth -in line with Droop macroscopic view- rather than cell division dynamics. We...
Tipo: Text
Palavras-chave: Population Balance Model; Variable-yield model; Cell Quota; Phytoplankton; Microalgae.
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00600/71187/69542.pdf

Ecotron - Embiez 8 - Modélisation de la production d'organismes planctoniques dans les bassins
Provedor de dados: 5
Autores: Nival, Paul; Malara, G.
Choosing the best conditions for the cultivation of plankton in tanks is a difficult deal, which is generally solved by means of subjective estimations. A better way of looking for these conditions is the use of a mathematical model. _ We have tried to built a model that accounts for the physical and bio­logical characteristics of the tanks. The data concerning the physiological characteristics of the different group of organisms encountered are too scarce to allow all of them to be taken into account. The system studied here is composed of nutrients, phytoplankton, herbivorous copepods and rotifers to which benthic algae have been added. With the hypothesis of 3 elements (phyto - zooplankton - nutrients) it can be showed that when an equilibrium is...
Tipo: Text
Palavras-chave: Phytoplancton; Zooplancton; Culture; Modèle mathématique; Phytoplankton; Zooplankton; Culture; Mathematical model.
Ano: 1979
URL: http://archimer.ifremer.fr/doc/00306/41673/40882.pdf

Résultats de la mise en oeuvre des réseaux REPHY et SRN - Zone côtières de la Manche orientale et de la baie sud de la Mer du Nord - Bilan de l'année 2014
Provedor de dados: 5
Autores: Lefebvre, Alain; Flesch, Morgane.
The coastal zone of the Nord – Pas de Calais / Picardie showed dysfonctioning patterns of the ecosystem considered to be link to human activities along shores. These results in regular massive development of species, such as the phytoplanktonic seaweed, Phaeocystis sp. which life cycle was partly linked to nutrients availability and consequently to anthropogenic inputs. As part of the evaluation of the influence of continental inputs on the marine environment (nitrates, phosphates,…) and on potential eutrophication processes, of the estimation of the efficiency of the sewage treatments plants in the possible elimination of dumpings and in order to establish a long-term survey to follow up the change in coastal waters quality, the regional nutrients...
Tipo: Text
Palavras-chave: Manche Orientale; Baie sud de la Mer du Nord; Hydrologie; Phytoplancton; Phaeocystis globosa; Eastern English Channel; Hydrology; Phytoplankton; Phaeocystis globosa; Southern bight of the North Sea.
Ano: 2015
URL: http://archimer.ifremer.fr/doc/00280/39133/37687.pdf

Phytoplankton and bacterial alkaline phosphatase activities in relation to phosphate and DOP availability within the Gironde plume waters (Bay of Biscay)
Provedor de dados: 5
Autores: Labry, Claire; Delmas, Daniel; Herbland, Alain.
Previous studies conducted on the continental shelf in the Southeast Bay of Biscay influenced by Gironde waters (one of the two largest rivers on the French Atlantic coast) showed the occurrence of late winter phytoplankton blooms and phosphorus limitation of algal growth thereafter. In this context, the importance of dissolved organic phosphorus (DOP) for both algae and bacteria was investigated in 1998 and 1999 in terms of stocks and fluxes. Within the mixed layer, although phosphate decreased until exhaustion from winter to spring, DOP remained high and phosphate monoesters made up between I I to 65% of this pool. Total alkaline phosphatase activity (APA, V-max) rose gradually from winter (2-8 nM h(-1)) to late spring (100-400 nM h-1), which was mainly...
Tipo: Text
Palavras-chave: Phytoplankton; Phosphate; Gironde; DOP; Bacteria; Alkaline phosphatases.
Ano: 2005
URL: http://archimer.ifremer.fr/doc/2005/publication-608.pdf

Origine et devenir de la matière organique au sein du micro-estuaire temporaire de Fiume Santu (L’Agriate, Haute-Corse)
Provedor de dados: 5
Autores: Massey, Jean-laurent.
In relation with meteorological, hydrological and topographic characteristics, Corsica has a very large number of temporarily open/closed micro-estuaries. Agriates contains several of them, including the Fiume Santu’s temporarily micro-estuary. These ecosystems are specific because of their sporadic connection with the sea. The opening and closure depends on both the river flow and the presence of the Posidonia oceanica (L.) Delile “banquettes”. Characterization of the global functioning was based on a multiparameter approach (particulate matter and dissolved inorganic matter descriptors, carbon and nitrogen stable isotope, phytoplankton communities), in order to qualify and quantify the organic matter (OM), along an estuary – coastal zone gradient. The OM...
Tipo: Text
Palavras-chave: Corsica; Fiume Santu; Micro-estuaire temporaire; Matière organique; Isotopes stables; Nutriments; Phytoplancton; Corsica; Fiume Santu; Temporarily open/closed micro-estuary; Organic matter; Stable isotope; Nutrients; Phytoplankton.
Ano: 2015
URL: http://archimer.ifremer.fr/doc/00276/38691/37188.pdf

Phytoplancton en baie de Seine. Influence du panache fluvial sur la production primaire
Provedor de dados: 5
Autores: Videau, Christiane; Ryckaert, Mireille; L' Helguen, Stéphane.
Phytoplankton distribution and primary productivity were investigated in the Bay of Seine (eastern English Channel, France) in spring and early summer of 1992 and 1994. In 1992, the horizontal distribution of phytoplankton species was determined over the whole Bay of Seine. In 1994, species distribution and primary productivity were studied along the salinity gradient of the Seine plume and in the neighbouring marine waters. Phytoplankton distribution was characterised by the permanent diatom dominance from early spring to early summer. The spring bloom did not occur uniformly over the bay, but was initiated in the marine waters, in the middle of the bay and progressed towards the coast where it developed, in June, in the diluted waters of the Seine plume....
Tipo: Text
Palavras-chave: Baie de Seine; Production primaire; Phytoplancton; Bay of Seine; Primary productivity; Phytoplankton.
Ano: 1998
URL: http://archimer.ifremer.fr/doc/00333/44398/44057.pdf

Phytoplankton dynamics in the southern New Caledonian lagoon during a southeast trade winds event
Provedor de dados: 5
Autores: Neveux, Jacques; Lefebvre, Jean-pierre; Le Gendre, Romain; Dupouy, Cecile; Gallois, Francis; Courties, Claude; Gerard, Philippe; Fernandez, Jean-michel; Ouillon, Sylvain.
During the Echolag cruise (13 February-8 March 2007), the effect of 16-30 knot trade winds on abundance, community structure and dynamics of phytoplankton was investigated in the southern part of the New Caledonian coral reefs and surrounding oceanic waters. In this area, the coral reefs form two horn-like structures (hereinafter referred to as 'horn reefs'), oriented south-east, and separated by a relatively deep valley. Three repeated samplings at one week intervals of a 32 station array showed that trade winds induce surface water cooling and significant enrichment of mid- and bottom waters above the reef shelf. This enrichment appeared as the result of a general rise of the oceanic thermocline and nitracline due to the combination of trade winds and...
Tipo: Text
Palavras-chave: Chlorophyll; Phycoerythrin; Flow cytometry; Phytoplankton; In vivo fluorescence; Growth rate; Trade winds; Lagoon; Internal wave; New Caledonia.
Ano: 2010
URL: http://archimer.ifremer.fr/doc/00013/12437/9258.pdf

French phytoplankton monitoring: an exploration of optimum data presentation
Provedor de dados: 5
Autores: Belin, Catherine.
Different ways are explored for presenting 12 years of data on phytoplankton species and toxins in shellfish collected along the French coast and within the framework of the French Phytoplankton Monitoring Network. The advantages and difficulties of aggregating data in different dimensions are discussed. For example, graphs appear suitable only for restricted areas, while mapping is necessary for results on regional or larger scales. Within each of these broad categories, considerable care is required when identifying the appropriate type of information and presentation.
Tipo: Text
Palavras-chave: Data presentation; Mapping; Monitoring; Phytoplankton; Plotting.
Ano: 1998
URL: http://archimer.ifremer.fr/doc/00446/55775/57627.pdf

Phytoplankton competition and coexistence: Intrinsic ecosystem dynamics and impact of vertical mixing
Provedor de dados: 5
Autores: Perruche, Coralie; Riviere, Pascal; Pondaven, Philippe; Carton, Xavier.
This paper aims at studying analytically the functioning of a very simple ecosystem model with two phytoplankton species. First, using the dynamical system theory, we determine its nonlinear equilibria, their stability and characteristic timescales with a focus on phytoplankton competition. Particular attention is paid to the model sensitivity to parameter change. Then, the influence of vertical mixing and sinking of detritus on the vertically-distributed ecosystem model is investigated. The analytical results reveal a high diversity of ecosystem structures with fixed points and limit cycles that are mainly sensitive to variations of light intensity and total amount of nitrogen matter. The sensitivity to other parameters such as remineralisation, growth...
Tipo: Text
Palavras-chave: Water mixing; Dynamical system; Phytoplankton; Competition; Ecosystem; Modelling.
Ano: 2010
URL: http://archimer.ifremer.fr/doc/2009/publication-7334.pdf

Natural variability of bio-optical properties in Case 1 waters: attenuation and reflectance within the visible and near-UV spectral domains, as observed in South Pacific and Mediterranean waters
Provedor de dados: 5
Autores: Morel, A.; Claustre, H.; Antoine, D.; Gentili, B.
The optical properties of Case 1 waters have been empirically related to the chlorophyll concentration, [Chl], historically used as an index of the trophic state and of the abundance of the biological materials. The well-known natural variability around the mean statistical relationships is here examined by comparing the apparent optical properties (spectral downward irradiance attenuation and reflectance) as a function of [Chl] in two Case 1 environments, the Pacific and Mediterranean waters. These oceanic zones apparently represent two extremes of the possible bio-optical variability range around the mean. The systematic deviations, in both directions with respect to the average laws, mainly result from the differing contents in non-algal detrital...
Tipo: Text
Palavras-chave: Light absorption; Algal biomass; Ocean color; Chlorophyll; Sea; Phytoplankton; Model; Coefficients; Algorithms.
Ano: 2007
URL: https://archimer.ifremer.fr/doc/00209/32012/30549.pdf

Phytoplankton diversity during the spring bloom in the northwestern Mediterranean Sea
Provedor de dados: 5
Autores: Percopo, Isabella; Siano, Raffaele; Cerino, Federica; Sarno, Diana; Zingone, Adriana.
The section of the Liguro-Provencal basin north of the Balearic Islands is one of the most productive sites in the whole Mediterranean Sea, with intense phytoplankton bloom lasting about 2 months in late winter-early spring. The phytoplankton species composition of the area was investigated using light and electron microscopy to analyze bottle and net samples collected at several stations in spring 2000 and 2003. Serial dilution cultures established from bottle samples were also examined. A total of 168 phytoplankton taxa was identified, consisting of 73 Coscinodiscophyceae, 47 Dinophyceae, 25 Coccolithophyceae and 4 Prymnesiophyceae, 5 Prasinophyceae, 3 Chrysophyceae, 2 Cryptophyceae, 2 Dictyochophyceae, 1 Euglenophyceae, 1 Pelagophyceae, 1...
Tipo: Text
Palavras-chave: Check-list; Diversity; NW Mediterranean Sea; Phytoplankton; Serial dilution cultures.
Ano: 2011
URL: http://archimer.ifremer.fr/doc/00038/14916/12245.pdf

Acquisition de données complémentaires aux dénombrements, avec les techniques d’analyses pigmentaires et de diversité génétique. Etat d’avancement et premiers résultats. Action Indice Composition. Livrable n° AIV. Rapport final, 16 juillet 2014.
Provedor de dados: 5
Autores: Delmas, Daniel; Siano, Raffaele.
Studies on phytoplankton community diversity cannot be limited microphytoplankton (cells&gt;20 ìm), it is indeed necessary to take into account also the nano (3-20ìm) picophytoplankton (&lt;3 ìm) components. In the frame of this work aimed at studying temporal phytoplankton community diversity two complementary methodologies of phytoplankton sample analysis, pigment and genetic (metarbarcoding) diversity, have been used as alternative to routine morphological analysis carried out at light microscopy. The REPHY station (047-P-016 Concarneau Large) off-shore the Concarneau Bay has been sampled during the annual highest phytoplankton production (March-July 2012) with a frequent sample interval strategy (twice per week). Results obtained by both pigment and...
Tipo: Text
Palavras-chave: Phytoplancton; Structure de taille; Picophytoplancton; Nanophytoplancton; Microphytoplancton; Diversité génétique; Metabarcoding; Taxonomie pigmentaire; Façade atlantique; Baie de Concarneau; Phytoplankton; Size classes; Picophytoplankton; Nanophytoplankton; Microphytoplankton; Genetic diversity; Metabarcoding; Pigment taxonomy; Atlantic coasts; Concarneau Bay.
Ano: 2014
URL: http://archimer.ifremer.fr/doc/00361/47260/47225.pdf

Evolution divergente de cultures phytoplanctoniques marines en relation avec la qualité des enrichissements
Provedor de dados: 5
Autores: Divanach, P.; Sube, J.
Four marine phytoplanctonic cultures from natural inoculum of Nannodito sp. have been submitted to different fertilizers in identical light and tem­perature conditions. The composition of enrichments has been studied to introduce Nitrogen as comparative factor. One tank without nutrients and three enriched cultures, the first only with sodium nitrate, the second with "Conway medium" and the last in which nutri­ents were provided by convenient dilution of "foam", have been followed for phy­sical, chemical, biological parameters during three months. Temperature, pH, dis­solved oxygen, optical density, particulate matters, Organic Carbon, Nitrogen, Phos phorus, Calcium, Magnesium, Sodium, Potassium, metal traces and biological parame­ters were analysed...
Tipo: Text
Palavras-chave: Enrichissements; Recyclage; Écume; Phytoplancton; Déchets; Aquaculture; Enrichments; Recycling; Foam; Phytoplankton; Wastes; Aquaculture.
Ano: 1979
URL: http://archimer.ifremer.fr/doc/00305/41662/42780.pdf

The Underwater Vision Profiler 5: An advanced instrument for high spatial resolution studies of particle size spectra and zooplankton
Provedor de dados: 5
Autores: Picheral, Marc; Guidi, Lionel; Stemmann, Lars; Karl, David M.; Iddaoud, Ghizlaine; Gorsky, Gabriel.
The Underwater Vision Profiler (UVP) was developed to quantify the vertical distribution of macroscopic particles and zooplankton &gt; 100 mu m in size. The smaller size limit is fixed by optical resolution, whereas the larger size limit is determined by the volume of water illuminated per image. The new fifth generation instrument (UVP5) is compact (30 kg in air) and operates either as a stand-alone instrument with an independent power supply for use on a mooring or free-drifting array, or as a component of a Conductivity, Temperature, and Depth (CTD)-rosette package. Images are recorded at a frequency up to 6 Hz. If the UVP5 is interfaced with a CTD, these images are acquired and analyzed in real time. Images are recorded every 20 cm at the 1 m s(-1)...
Tipo: Text
Palavras-chave: Video plankton recorder; Marine snow; MU-M; Vertical distribution; Aggregate dynamics; In situ; System; Ocean; Flux; Phytoplankton.
Ano: 2010
URL: http://archimer.ifremer.fr/doc/00133/24413/22426.pdf

Comet assay in phytoplankton as biomarker of genotoxic effects of environmental pollution
Provedor de dados: 5
Autores: Akcha, Farida; Arzul, Genevieve; Rousseau, Sabrina; Bardouil, Michele.
The alkaline comet assay was tested on different microalgae: the clinofiagellates, Karenia mikimotoi and Alexandrium minuturn, and the diatom, Chaetoceros gracilis. The microalgae were exposed during their exponential growth to the model direct genotoxicant, hydrogen peroxide (1 h, 5 and 100 pM H2O2). Following H2O2 exposure, the comet assay was validated only for K. mikimotoi for which genotoxicity was observed from the lowest tested concentration of 5 pM with a concentration-dependent effect. C. gracilis was too small in size (4 mu m) to be correctly analysed. For A. minuturn, our lysis buffer was not strong enough to digest the cellulosic thecal plates. For K. mikimotoi, the comet assay was thus applied for the study of the genotoxic effects of...
Tipo: Text
Palavras-chave: Comet assay; Genotoxicity; Pesticides; Phytoplankton.
Ano: 2008
URL: http://archimer.ifremer.fr/doc/2008/publication-4504.pdf

Dynamique du phosphore et rôle comme facteur limitant de la production planctonique dans le panache de la Gironde sur le plateau continental Sud Gascogne
Provedor de dados: 5
Autores: Labry, Claire.
This study was supported by the Atlantic working site of the « Programme National d’Océanographie Côtière » (PNOC, PNEC since 1999). The objectives were (1) to check the existence and to understand the mechanisms of winter phytoplankton blooms in the bay of Biscay influenced by the Gironde waters (2) to determine the limiting nutrient of the primary production associated to these blooms and to follow the seasonal evolution of the limiting nutrient, (3) to understand the consequences of this early limitation on the structuration of algal populations in spring. Since phosphorus was supposed to be the major limiting nutrient of algal growth in the Gironde plume, the different forms of the phosphorus cycle as well as the bacterial compartment, central in this...
Tipo: Text
Palavras-chave: Golfe de Gascogne; Gironde; Phytoplancton; Bactéries; Phosphates; Phosphore organique; Dissous; Phosphatases; Bay of Biscay; Gironde; Phytoplankton; Bacteria; Phosphate; Dissolved organic phosphorus; Phosphatases.
Ano: 2001
URL: http://archimer.ifremer.fr/doc/00013/12463/9298.pdf

Comparing marine primary production estimates through different methods and development of conversion equations
Provedor de dados: 5
Autores: Regaudie-de-gioux, Aurore; Lasternas, Sébastien; Agustí, Susana; Duarte, Carlos M.
Numerous studies have compared the rates of primary production using various techniques at specific locations and times. However, these comparisons are local and cannot be used to compare or scale rates of primary production using different methods across ocean basins or seasonal time scales. Here, we quantify the range in rates of primary production derived using different techniques and provide equations that allow conversions of estimates between different methods. We do so on the basis of a compilation of data on volumetric estimates of primary production rates concurrently estimated with at least two different methods. We observed that the comparison of estimates of marine phytoplankton primary production derived from different methods reveals very...
Tipo: Text
Palavras-chave: Marine; Phytoplankton; GPP; Methods; Conversion.
Ano: 2014
URL: https://archimer.ifremer.fr/doc/00420/53120/54072.pdf

A Bibliometric Analysis of Microalgae Research in the World, Europe, and the European Atlantic Area
Provedor de dados: 5
Autores: Rumin, Judith; Nicolau, Elodie; Gonçalves De Oliveira Junior, Raimundo; Fuentes-grünewald, Claudio; Flynn, Kevin J; Picot, Laurent.
A bibliographic database of scientific papers published by authors affiliated worldwide, especially focused in Europe and in the European Atlantic Area, and containing the keywords “microalga(e)” or “phytoplankton” was built. A corpus of 79,020 publications was obtained and analyzed using the Orbit Intellixir software to highlight the evolution of the research domain. Publication rates from 1960 to 2019, organization of the research, collaboration networks between countries and organizations, emerging and fading research concepts, major studied species, and associated concepts, as well as journals publishing microalgae research were considered. As a result, of the 79,020 papers published worldwide, 26,137 included authors from Europe (33% of world...
Tipo: Text
Palavras-chave: Biotechnology; European Atlantic Area; Microalgae; Phytoplankton; Research; Market; Bibliometrics.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00605/71725/70191.pdf

Assessing spatial and temporal variability of phytoplankton communities' composition in the Iroise Sea ecosystem (Brittany, France): A 3D modeling approach. Part 1: Biophysical control over plankton functional types succession and distribution
Provedor de dados: 5
Autores: Cadier, Mathilde; Gorgues, Thomas; Sourisseau, Marc; Edwards, Christopher A.; Aumont, Olivier; Marie, Louis; Memery, Laurent.
Understanding the dynamic interplay between physical, biogeochemical and biological processes represents a key challenge in oceanography, particularly in shelf seas where complex hydrodynamics are likely to drive nutrient distribution and niche partitioning of phytoplankton communities. The Iroise Sea includes a tidal front called the ‘Ushant Front’ that undergoes a pronounced seasonal cycle, with a marked signal during the summer. These characteristics as well as relatively good observational sampling make it a region of choice to study processes impacting phytoplankton dynamics. This innovative modeling study employs a phytoplankton-diversity model, coupled to a regional circulation model to explore mechanisms that alter biogeography of phytoplankton in...
Tipo: Text
Palavras-chave: Iroise Sea; Tidal mixing front; Biogeochemical modeling; Phytoplankton; Functional groups; Seasonal cycle.
Ano: 2017
URL: http://archimer.ifremer.fr/doc/00352/46367/45986.pdf

Drivers and ecological consequences of dominance in periurban phytoplankton communities using networks approaches
Provedor de dados: 5
Autores: Escalas, Arthur; Catherine, Arnaud; Maloufi, Selma; Cellamre, Maria; Hamlaoui, Sahima; Yepremian, Claude; Louvard, Clarisse; Trousselier, Marc; Bernard, Cécile.
Evaluating the causes and consequences of dominance by a limited number of taxa in phytoplankton communities is of huge importance in the current context of increasing anthropogenic pressures on natural ecosystems. This is of particular concern in densely populated urban areas where usages and impacts of human populations on water ecosystems are strongly interconnected. Microbial biodiversity is commonly used as a bioindicator of environmental quality and ecosystem functioning, but there are few studies at the regional scale that integrate the drivers of dominance in phytoplankton communities and their consequences on the structure and functioning of these communities. Here, we studied the causes and consequences of phytoplankton dominance in 50...
Tipo: Text
Palavras-chave: Dominance; Phytoplankton; Co-occurrence network; Community cohesion; Community functioning; Periurban waterbodies.
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00508/61962/66081.pdf

Suivi régional des nutriments (S.R.N.) sur le littoral du Nord, du Pas-de-Calais et de la Picardie - Bilan de l'année 2009
Provedor de dados: 5
Autores: Lefebvre, Alain; Cordier, Remy.
The coastal zone of the Nord- Pas de Calais 1 Picardie showed dysfonctioning patterns of the ecosystem considered to be link to human activities along shores. These results in regular massive development of species, such as the phytoplanktonic seaweed, Phaeocystis sp. which life cycle was partly linked to nutrients availability and consequently to anthropogenic inputs. As part of the evaluation of the influence of continental inputs on the marine environment (nitrates, phosphates, ... ) and on potential eutrophication processes, of the estimation of the efficiency of the sewage treatments plants in the possible elimination of dumpings and in order to establish a long-term survey to follow up the change in coastal waters quality, the regional nutrients...
Tipo: Text
Palavras-chave: Qualité des eaux littorales; Manche orientale; Baie Sud de la mer du Nord; SurveillanceNutriments; Phytoplancton; Phaeocystis globosa; Quality of coastal waters; Eastern English Channel; Southern bight ofthe North Sea; MonitoringNutrients; Phytoplankton; Phaeocystis globosa.
Ano: 2010
URL: http://archimer.ifremer.fr/doc/00082/19363/16957.pdf

Characterization of Cr. gigas oysters mortalities according to the French Ifremer/REMORA monitoring network ; with complements from phytoplankton and meteorogolical data
Provedor de dados: 5
Autores: Fleury, Pierre-gildas; Mazurie, Joseph; Ropert, Michel; Soletchnik, Patrick; Le Coz, Florence.
The wide range of data from the French Ifremer/REMORA network, collected since 1993 allow a global characterization of mortalities of 1-year old and 2-years old cupped oysters Crassostrea gigas, that are cultivated in the main French oyster areas (Fleury et al, 2003), and thus a better understanding of the causes of these mortalities (Ifremer /MOREST project).  The average annual mortalities on intertidal sites range from 10 to 20%. Most of the mortalities take place in Spring and Summer. 1-year oyster mortalities occur in Marennes and several sites in Brittany whilst 2-years oyster mortalities occur in the same sites and in baie des Veys (Normandy). In addition, 2-years oyster mortalities appear more variable according to different annual surveys....
Tipo: Text
Palavras-chave: Meteorolgical factors; Phytoplankton; REMORA; Mortalities; Oysters; Crassostrea gigas.
Ano: 2008
URL: http://archimer.ifremer.fr/doc/2008/acte-4547.pdf

Dynamics of phytoplankton communities in eutrophying tropical shrimp ponds affected by vibriosis
Provedor de dados: 5
Autores: Lemonnier, Hugues; Lantoine, Francois; Courties, Claude; Guillebault, Delphine; Nezan, Elisabeth; Chomerat, Nicolas; Escoubeyrou, Karine; Galinie, Christian; Blockmans, Bernard; Laugier, Thierry.
Tropical shrimp aquaculture systems in New Caledonia regularly face major crises resulting from outbreaks of Vibrio infections. Ponds are highly dynamic and challenging environments and display a wide range of trophic conditions. In farms affected by vibriosis, phytoplankton biomass and composition are highly variable. These conditions may promote the development of harmful algae increasing shrimp susceptibility to bacterial infections. Phytoplankton compartment before and during mortality outbreaks was monitored at a shrimp farm that has been regularly and highly impacted by these diseases. Combining information from flow cytometry, microscopy, pigment and phylogenetic analysis, the presence of Picocyanobacteria, Prasinophyceae and Diatomophyceae were...
Tipo: Text
Palavras-chave: Tropical aquaculture pond; Litopenaeus stylirostris; Vibriosis; Eutrophication; Phytoplankton; Harmful algae.
Ano: 2016
URL: http://archimer.ifremer.fr/doc/00343/45411/44986.pdf

Bilan de l'action de remise en eau du marais de kervijen (Littoral de la Baie de Douarnenez) dans le cadre d'une lutte contre la marée verte.
Provedor de dados: 5
Autores: Piriou, Jean-yves.
ln order to limit the excessive growth of macroalgae Ulva sp. on the beach of Kervijen (Bay of Douarnenez, Brittany, France), a field experiment was carried out, whereby part of the flow of a river was diverted into a coastal marsh. Results showed that the major part of spring and summer, Ulva proliferations have been suppressed. Part of the nitrate transported by river flow was consumed. The coastal marsh produced phytoplankton which regularly flowed on the beach
Tipo: Text
Palavras-chave: Marais; Nitrates; Phytoplancton; Ulva sp.; Coastal marsh; Nitrates; Phytoplankton; -U/va sp.
Ano: 1993
URL: http://archimer.ifremer.fr/doc/00132/24299/22297.pdf

Dinophysis acuminate (dinophyceae), une espèce à géométrie variable sur les côtes françaises
Provedor de dados: 5
Autores: Lassus, Patrick; Marcaillou-le Baut, Claire.
Tipo: Text
Palavras-chave: Morphologie; Variabilité; Ultrastructure; Croissance; France; Dinophysis acuminata; Europe; Milieu marin; Zone côtière; Phytoplancton; Pyrrophycophyta; Algae; Thallophyta; Morphology; Variability; Ultrastructure; Growth; France; Europe; Marine environment; Coastal zone; Phytoplankton; Pyrrophycophyta; Algae; Thallophyta.
Ano: 1995
URL: http://archimer.ifremer.fr/doc/00133/24468/22484.pdf

Evolution du phytoplancton dans des bassins de culture
Provedor de dados: 5
Autores: Nival, Paul; Malara, G.; Lelong, P.; Cellario, C.; Charra, R.; Riva, A.
The concentration of chlorophyll a in large out-door continuous cul­ture was analysed in spring 1977 and 1978, and autumn - winter 1977-1978. The growth of marine phytoplankton in springsl977 is analysed with more details and shows three phases : - first, the diatoms (especially Skeletonema costatum) grow rapidely (27/4 to 3/5). The growth rate estimated by the chlorophyll measurements is 1.36 day“1. - then (3/5 to.13/5) the concentration of chlorophyll remains more or less constant (23.611.2 mg/m3) as well as the concentration of particulate organic matter. - at the end of the experiment (13/5 to 20/5) the concentration of chlo­rophyll falls as soon as Skeletonema costatum decrease in number.The declin of the phytoplankton biomass is followed by an...
Tipo: Text
Palavras-chave: Phytoplancton; Culture; Croissance; Composition chimique; Espèces; Phytoplankton; Culture; Growth; Chemical composition; Species.
Ano: 1979
URL: http://archimer.ifremer.fr/doc/00305/41668/40877.pdf

Eutrophication in a tropical pond: Understanding the bacterioplankton and phytoplankton dynamics during a vibriosis outbreak using flow cytometric analyses
Provedor de dados: 5
Autores: Lucas, Ronan; Courties, C.; Herbland, Alain; Goulletquer, Philippe; Marteau, Anne-laure; Lemonnier, Hugues.
In tropical shrimp ponds, the increasing of feed input, concomitantly with the stocking shrimp biomass, induces an eutrophication of the ecosystem. Although difficult to maintain, its stability is required to guarantee the success of the culture. A 110-day period of phytoplankton and bacterioplankton stock and dynamics in an earthen pond (1.2 ha area, 1 m depth) was monitored using flow cytometry to provide baseline information on community characteristics and ecosystem instability. Seven autotrophic cell types were identified over the whole sampling period. Prokaryotic cells included Synechococcus sp., a group named UNK which presented an atypical new flow cytometric signature and picoeukaryotes (PEUK). Nanophytoplankton cells were represented by 4...
Tipo: Text
Palavras-chave: Tropical shrimp aquaculture; Ecosystem shift; Phytoplankton; Bacterioplankton; Vibrio; Flow cytometry.
Ano: 2010
URL: http://archimer.ifremer.fr/doc/00029/14068/11312.pdf

Seasonal succession of cyanoprokaryotes in a hypereutrophic oligo-mesohaline lagoon from the South of France
Provedor de dados: 5
Autores: Chomerat, Nicolas; Garnier, Robert; Bertrand, Céline; Cazaubon, Arlette.
The Bolmon lagoon (South of France) is an oligo-mesohaline coastal lagoon that has undergone intense eutrophication in the past decades, resulting from a strong concentration of human activities in its drainage basin. Consequently, it exhibits some characteristics typical of an advanced trophic state; namely, the disappearance of submerged vegetation, the permanently intense phytoplankton growth and the recurrence of cyanoprokaryote blooms. As cyanoprokaryote dominance in south-temperate saline lagoons is little reported, we carried out this study in order to understand the seasonal variations in the phytoplankton composition and biomass, and to analyse the influence of environmental parameters such as salinity, nutrients and climate on the seasonal...
Tipo: Text
Palavras-chave: Turbid state; Pseudanabaena limnetica; Planktothrix agardhii; Phytoplankton; Mediterranean area; Cyanoprokaryotes; Ecology; Lagoon; Brackish water.
Ano: 2007
URL: http://archimer.ifremer.fr/doc/2007/publication-2593.pdf

Organisation spatiale et modélisation écologique d'un peuplement phytoplanctonique de lagune (étang de Thau, France)
Provedor de dados: 5
Autores: Jarry, V; Frisoni, Gf; Legendre, P.
A systematic sampling of twenty stations was conducted over four periods within a year (June 1986, October 1986, February 1987, and May 1987) in Thau lagoon. Multivariate analyses (clustering, and principal coordinate analysis) were carried out on phytoplankton species counts. These analyses allowed homogenous areas within the lagoon to be identified and permitted the characterization of these areas in terms of the marine or continental origins of their phytoplankton taxa. The results show the relative importance of each kind of input (marine, continental), and contrast the punctual influence of the continental inputs against the more global effects of the sea. The conclusions drawn from the taxonomic portion of the study were confirmed by statistical...
Tipo: Text
Palavras-chave: Phytoplankton; Populations; Chlorophyll pigments; Ecological modelling; Mediterranean lagoon; PHYTOPLANKTON; POPULATIONS; CHLOROPHYLL PIGMENTS; ECOLOGICAL MODELING; MEDITERRANEAN LAGOON.
Ano: 1991
URL: http://archimer.ifremer.fr/doc/00323/43397/43105.pdf

Optimisation de l’identification et du dénombrement du microphytoplancton avec le système couplé de numérisation et d’analyse d’images FlowCAM / ZooPhytoImage (système innovant). Action 9 – Livrable 2. Mise en oeuvre opérationnelle de l’outil FlowCAM-Zoo/PhytoImage dans le cadre de la surveillance REPHY. Résultats sur 12- 18 mois. Rapport final, février 2016
Provedor de dados: 5
Autores: Neaud-masson, Nadine; Lefebvre, Alain; Belin, Catherine; Gauthier, Emilie; Huguet, Antoine; Szidon, Antoine; Lefebvre, Arnaud; Cuvelliez, Rémi.
This deliverable includes several documents that reflect the operational implementation of the tool FlowCAM / ZooPhytoImage in the framework of REPHY. Among these documents, three reports make an assessment of the entire year 2015, which is not the case with other documents (Master 2 report issued in spring 2015, and minutes of meetings over the year). This summary will be limited to the findings of the three reports providing an updated view of the implementation of the tool. Work completed in 2015 for the operational implementation. The many scans performed in 2015 with the three FlowCAM present at Ifremer (Boulogne‐sur‐Mer, Arcachon and Nantes) allowed, one hand to feed the training sets of the tool FlowCAMZoo/PhytoImage, the other test its routine use....
Tipo: Text
Palavras-chave: Phytoplancton; FlowCAM; Zoo/PhytoImage; Numérisation; Analyse d’images; Set d’apprentissage; Outil de reconnaissance; Architecture de données; Bancarisation; Quadrige; Phytoplankton; FlowCAM; Zoo/PhytoImage; Scanning; Image analysis; Training set; Recognition tool; Data architecture; Banking; Quadrige.
Ano: 2016
URL: http://archimer.ifremer.fr/doc/00363/47413/47409.pdf

Pearl Oysters Pinctada margaritifera grazing on natural plankton in Ahe atoll lagoon (Tuamotu archipelago, French Polynesia)
Provedor de dados: 5
Autores: Fournier, Jonathan; Dupuy, Celie; Bouvy, Marc; Couraudon-reale, Marine; Charpy, Loic; Pouvreau, Stephane; Le Moullac, Gilles; Le Pennec, Marie-annick; Cochard, Jean-claude.
In atoll lagoons of French Polynesia, growth and reproduction of pearl oysters are mainly driven by plankton concentration. However, the actual diet of black-lip pearl oysters P. margaritifera in these lagoons is poorly known. To fill this gap, we used the flow through chamber method to measure clearance rates of P. margaritifera in Ahe atoll lagoon (Tuamotu Archipelago, French Polynesia). We found : (i) that pearl oysters cleared plankton at a rate that was positively related to plankton biovolume, (ii) that nanoflagellates were the main source of carbon for the pearl oysters, (iii) that the quantity and origin of carbon filtrated by pearl oysters was highly dependent on the concentration and composition of plankton. These results provide essential...
Tipo: Text
Palavras-chave: Pinctada margaritifera; Clearance rates; French Polynesia; Phytoplankton; Protists.
Ano: 2012
URL: http://archimer.ifremer.fr/doc/00078/18888/16599.pdf

Dynamics and sources of suspended particulate organic matter in the Marennes-Oléron oyster farming bay: Insights from stable isotopes and microalgae ecology
Provedor de dados: 5
Autores: Malet, Nathalie; Sauriau, Pierre-guy; Ryckaert, Mireille; Malestroit, Pascale; Guillou, Gael.
The aim of this study was to distinguish between sources of the complex variety of Marennes-Oléron Bay suspended particulate organic matter (SPOM) contributing to the tropho-dynamics of the Marennes-Oléron oyster farming bay. Basic biomarkers (Chl a, C/N and POC/Chl a ratios), carbon and nitrogen stable isotopes from SPOM were analyzed and the microalgae community was characterized. The sampling strategy was bimonthly from March 2002 to December 2003; samples were taken from an intertidal mudflat. Four main sources contributed to the SPOM pool: terrigenous input from rivers, neritic phytoplankton, resuspended microphytobenthos and periodic inputs from intertidal Zostera noltii meadows. Seasonal fluctuations were observed in both years of the study period:...
Tipo: Text
Palavras-chave: Heatwave; Zostera noltii; Mudflat; Microphytobenthos; Phytoplankton; Suspended particulate organic matter; Marennes Oléron Bay.
Ano: 2008
URL: http://archimer.ifremer.fr/doc/2008/publication-4313.pdf

Dinoflagelles toxiques sur les cotes francaises durant l'ete 1983. Synthese des connaissances sur les efflorescences estivales de Dinophysis et Gyrodinium.
Provedor de dados: 5
Autores: Marcaillou-le Baut, Claire.
The authors summarize briefly the information given by the foreign studies on two toxic marine dinoflagellates and present the situations observed in 1983 on the coasts of Normandy and Brittany.
Tipo: Text
Palavras-chave: France; ANE; Gyrodinium aureolum; Dinophysis acuminata; Phytoplankton; Red tides; Biological poisons; Algal blooms.
Ano: 1983
URL: http://archimer.ifremer.fr/doc/1983/publication-1804.pdf

Hydrodynamic conditions associated with the formation, maintenance and dissipation of a phytoplankton thin layer in a coastal upwelling system
Provedor de dados: 5
Autores: Velo-suarez, Lourdes; Fernand, Liam; Gentien, Patrick; Reguera, Beatriz.
During May-June 2005, a 17-d cruise was carried out in Ria de Pontevedra (Galician Rias Baixas) to study the physical-biological interactions that may lead to subsurface aggregations of phytoplankton organisms in thin layers (TLs). Physical processes governed the initiation and development, maintenance, and decline of a diatom (toxin producing Pseudo-nitzschia spp. and Chaetoceros socialis) TL during an upwelling relaxation-upwelling-downwelling sequence. Differences in shear profiles appeared to lead to the formation of a TL during upwelling events. These results reveal that the coupling between maximum values of shear and buoyancy frequency can shape a subsurface chlorophyll maximum (SCM) into a TL. The effect of shear upon phytoplankton patches, which...
Tipo: Text
Palavras-chave: Thin layer; Phytoplankton; Shear; Coastal upwelling system; Physical forcing; Coastal circulation.
Ano: 2010
URL: http://archimer.ifremer.fr/doc/00008/11905/9765.pdf

Phytoplancton et production primaire dans le secteur sud-occidental de la Mediterranee
Provedor de dados: 5
Autores: Furnestin, Marie-louise.
56 samples were collected from 14 stations along the Spanish coast, the North African coast, the Balearic Islands and Sardinia. 60 species of diatoms were recorded made up mostly of tychopelagic and benthic forms; these were far more abundant than the Dinophyceae of which only 22 species were recorded. 6 species of phytoplankton were dominant and represented similar to 70% of the total samples. The average content of chlorophyll a at depths of 1-70 m was 0.35 mg /m super(3), that of chlorophyll b was 0.15 mg/m super(3) and that of chlorophyll c was 2.20 m-S.P.U./M super(3)/hour. The highest level of chlorophyll a corresponded to regions of very low phosphate levels and the number of cells and species were at a maximum for an incident light of 10-15% and at...
Tipo: Text
Palavras-chave: Mediterranean sea; Geographical distribution; Phytoplankton; Primary production.
Ano: 1973
URL: http://archimer.ifremer.fr/doc/1973/publication-2224.pdf

Phytoplankton morphology controls on marine snow sinking velocity
Provedor de dados: 5
Autores: Laurenceau-cornec, Emmanuel C.; Trull, Thomas W.; Davies, Diana M.; De La Rocha, Christina L.; Blain, Stephane.
During the second KErguelen Ocean and Plateau compared Study (KEOPS2) in October-November 2011, marine snow was formed in roller tanks by physical aggregation of phytoplankton assemblages sampled at 6 stations over and downstream of the Kerguelen Plateau. Sinking velocities, morphology, bulk composition (transparent exopolymer particles, biogenic silica, particulate organic carbon), and phytoplankton contents were measured individually on 66 aggregates to identify controls on sinking velocities. Equivalent spherical diameters (ESD) ranged from 1 to 12 mm, and the particle aspect ratios, Corey shape factors, and fractal dimensions (D-F1 = 1.5, D-F2 = 1.8) were close to those of smaller natural aggregates (0.2 to 1.5 mm) collected in polyacrylamide...
Tipo: Text
Palavras-chave: Sinking velocity Marine snow; Aggregation; Phytoplankton; Porosity.
Ano: 2015
URL: https://archimer.ifremer.fr/doc/00352/46275/46044.pdf

Fonctionnement des marais maritimes atlantiques: échanges d'énergie et effets des flux aquacoles diffus
Provedor de dados: 5
Autores: Bel Hassen, Malika.
French estuaries, from the Atlantic coast to the English channel, have been characterized by a poor phytoplankton biomass. The turbidity has always been considered as the limiting factor for phytoplankton. Estuarine ecosystems are situated at the boundary between the land and the sea. Consequently, they are subject to an enrichment by nutrient loadings from upland ecosystems. Although it has been demonstrated that a part of the nutrient loadings support an important benthic production. The part, which escapes to the estuarine benthic and planktonic food web and is exported to adjacent estuarine ecosystems, still remains undetermined. Quantifying the nu trient and particulate matter exchange between a macrotidal Bay, the Fier d'Ars, and the adjacent ocean...
Tipo: Text
Palavras-chave: Aquaculture; Exportation; Matière dissoute; Fiers d'Ars; Systèmes d'Information Géographique; Importation; Usages; Lumière; Micorphytobenthos; Modélisation; Nutriments; Matière organique; Matière particulaire; Phytoplancton; Sédimentation; Aquaculture; Export; Dissolved matter; Fier d'Ars Bay; Geographic Information Systems; Import; Land use; Light; Microphytobenthos; Modelling; Nutrients; Organic matter; Particulate matter; Phytoplankton; Sedimentation.
Ano: 2000
URL: http://archimer.ifremer.fr/doc/00450/56185/57738.pdf

Assessing phytoplankton realized niches using a French National Phytoplankton Monitoring Network
Provedor de dados: 5
Autores: Hernandez Farinas, Tania; Bacher, Cedric; Soudant, Dominique; Belin, Catherine; Barille, Laurent.
Relating environmental factors to species occurrence is a fundamental step in a better understanding of the community structure, the spatial and temporal dynamics of populations and how species may respond to environmental changes. In this paper, we used phytoplankton occurrence data, from a French national phytoplankton monitoring network, and environmental variables with the aim of characterizing the realized ecological niches of phytoplankton groups. We selected 35 phytoplankton taxa representing the most important taxa in terms of occurrence frequency and abundance along the French coast of the eastern English Channel, the Southern Bight of the North Sea and the Atlantic Ocean. We show that environmental variables such as nutrient concentration, water...
Tipo: Text
Palavras-chave: Phytoplankton; Environment; Niche position; Tolerance; Kernel density; Outlying mean index.
Ano: 2015
URL: https://archimer.ifremer.fr/doc/00255/36627/35263.pdf

Effects of petroleum biodegradation products on phytoplankton growth.
Provedor de dados: 5
Autores: Goutx, H; Berland, B; Leveau, M; Bertrand, J.
The effects of products resulting from petroleum biodegradation in continuous culture, have been studied on the growth of two marine algae. Sugars, lipids and amino acids are the main components resulting from petroleum degradation in the bacteria used medium. Their concentrations are respectively 600 mg.l super(-1), 46 mg.l super(-1) and 74.2 mu M.l super(-1). The algae growth is inhibited when products are enough concentrated; it is stimulated by low concentration. Among these products, lipids are more toxic than others. The two species show different sensitivity towards the used medium. Prorocentrum micans growth is more inhibited than that of Phaeodactylum tricornutum .
Tipo: Text
Palavras-chave: Bacteria; Phytoplankton; Toxicity; Oil pollution; Crude oil; Biodegradation.
Ano: 1984
URL: http://archimer.ifremer.fr/doc/1984/acte-1017.pdf

Interspecific differences in the effect of fish on marine microbial plankton
Provedor de dados: 5
Autores: Villeger, Sebastien; Fouilland, Eric; Argenty, Jeremy; Bouvier, Corinne; Carre, Claire; Bouvier, Thierry.
The productivity of most marine ecosystems is limited by the availability of dissolved nitrogen (N) and phosphorus (P). Nutrient recycling is therefore a key process for ecosystem functioning. Fish recycle nutrients through the excretion of ammonia and phosphate and can influence the abundance and community structure of primary producers such as phytoplankton. However, the effect of fish on other plankton compartments, and whether all fish species have similar effects, is largely unknown. We used a tank experiment to test how 2 Mediterranean fish species, gilthead seabream Sparus aurata and golden mullet Chelon auratus, with distinctly different N and P excretion rates, can affect the abundance and community structure of 3 plankton compartments:...
Tipo: Text
Palavras-chave: Marine fish; Nutrient excretion; Protozooplankton; Phytoplankton; Bacteria.
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00584/69659/67585.pdf

Evaluation de la qualité des eaux littorales de la France métropolitaine pour l'élément de qualité Phytoplancton dans le cadre de la DCE. Etat des lieux des règles d’évaluation, et résultats pour la période 2007‐2012. Tome 2 ‐ Résultats détaillés : fiches par masse d’eau et éléments d’expertise
Provedor de dados: 5
Autores: Belin, Catherine; Lamoureux, Alice; Soudant, Dominique.
Ce rapport en deux tomes détaille les résultats de l’évaluation, avec les règles de la DCE (Directive Cadre sur l’Eau), de l’élément de qualité phytoplancton dans les masses d’eau de la France métropolitaine. Cette évaluation est réalisée à partir des données acquises sur la période 2007-2012. Ce rapport contient également un état des lieux des grilles d’évaluation de l’indicateur phytoplancton qui sont applicables en 2014 pour les eaux littorales, et replace cette évaluation dans son contexte réglementaire, en rappelant les exigences de la DCE pour l’élément de qualité phytoplancton, et en donnant des informations sur l’avancement des travaux d’inter-calibration et l’état des décisions au niveau européen. Enfin il fait le point sur l’avancement des...
Tipo: Text
Palavras-chave: DCE; Phytoplancton; Évaluation qualité; Masses d’eau; Métriques d’évaluation; Grilles d’évaluation; Valeurs de référence; WFD; Phytoplankton; Quality assessment; Water bodies; Evaluation metrics; Evaluation grids; Reference values.
Ano: 2014
URL: http://archimer.ifremer.fr/doc/00394/50492/51228.pdf

A Global Plankton Diversity Monitoring Program
Provedor de dados: 5
Autores: Batten, Sonia D.; Abu-alhaija, Rana; Chiba, Sanae; Edwards, Martin; Grahams, George; Jyothibabu, R.; Kitchener, John A.; Koubbis, Philippe; Mcquatters-gollop, Abigail; Muxagata, Erik; Ostle, Clare; Richardson, Anthony J.; Robinson, Karen, V; Takahashi, Kunio T.; Verheye, Hans M.; Wilson, Willie.
Plankton are the base of marine food webs, essential to sustaining fisheries and other marine life. Continuous Plankton Recorders (CPRs) have sampled plankton for decades in both hemispheres and several regional seas. CPR research has been integral to advancing understanding of plankton dynamics and informing policy and management decisions. We describe how the CPR can contribute to global plankton diversity monitoring, being cost-effective over large scales and providing taxonomically resolved data. At OceanObs09 an integrated network of regional CPR surveys was envisaged and in 2011 the existing surveys formed the Global Alliance of CPR Surveys (GACS). GAGS first focused on strengthening the dataset by identifying and documenting CPR best practices,...
Tipo: Text
Palavras-chave: Continuous Plankton Recorder; Zooplankton; Phytoplankton; Global monitoring; Biodiversity; Ocean observing; Essential ocean variables.
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00689/80060/83064.pdf

Mortalites de poissons en baie de Vilaine (Juillet 1982) Causes - Mécanismes - Propositions d'action
Provedor de dados: 5
Autores: Merceron, Michel.
The massive number of fish mortalities that occurred in July of 1982 in Vilaine Bay is due to a very pronounced oxygen depletion in the bay's bottom waters. This loss was caused by the chronic fragility of this area, associated with an abnormal weather pattern. The endemism of partial oxygen depletion has been brought to light. The latter could be economically more significant than the anoxia of 1982. Preventative and warning actions have been proposed.
Tipo: Text
Palavras-chave: Brittany; Dam; Estuary; Meteorological factors; Stratification; Phytoplankton; Oxygen depletion; Coastal waters; Fish kill; Estuaire; Facteurs météorologiques; Stratification; Prolifération planctonique; Déficit en oxygène; Eaux côtières; Mortalité de poisson.
Ano: 1987
URL: http://archimer.ifremer.fr/doc/1987/rapport-2836.pdf

Influence of plankton concentration on gametogenesis and spawning of the black lip pearl oyster Pinctada margaritifera in Ahe atoll lagoon (Tuamotu archipelago, French polynesia)
Provedor de dados: 5
Autores: Fournier, Jonathan; Levesque, Emmanuelle; Pouvreau, Stephane; Le Pennec, Marcel; Le Moullac, Gilles.
Pearl culture industry represents one of the dominant business sector of French Polynesia. However, it still entirely relies on unpredictable spat collection success. Our aim was to assess the influence of natural plankton concentration fluctuations on maturation and spawning of the black lip pearl oyster Pinctada margaritifera, during a 4 months survey conducted in Ahe atoll lagoon. Plankton concentration was assessed by chlorophyll a extraction and by microscope counts while gonadic index, gonado-visceral dry weights and histology were used to measure pearl oysters reproduction activity. We found that (i) plankton concentration fluctuations were mainly related to wind regime, (ii) gametogenesis rate was mainly related to plankton concentration, (iii)...
Tipo: Text
Palavras-chave: Pearl Oyster; Gametogenesis; Spawning; Phytoplankton; French Polynesia.
Ano: 2012
URL: http://archimer.ifremer.fr/doc/00101/21201/19697.pdf

Phytoplankton growth formulation in marine ecosystem models: Should we take into account photo-acclimation and variable stoichiometry in oligotrophic areas?
Provedor de dados: 5
Autores: Ayata, S. -d.; Levy, Marina; Aumont, Olivier; Sciandra, Antoine; Sainte-marie, J.; Tagliabue, A.; Bernard, Olivier.
The aim of this study is to evaluate the consequences of accounting for variable Chl:C (chlorophyll:carbon) and C:N (carbon:nitrogen) ratios in the formulation of phytoplankton growth in biogeochemical models. We compare the qualitative behavior of a suite of phytoplankton growth formulations with increasing complexity: 1) a Redfield formulation (constant C:N ratio) without photo-acclimation (constant Chl:C ratio), 2) a Redfield formulation with diagnostic chlorophyll (variable and empirical Chl:C ratio), 3) a quota formulation (variable C:N ratio) with diagnostic chlorophyll, and 4) a quota formulation with prognostic chlorophyll (dynamic variable). These phytoplankton growth formulations are embedded in a simple marine ecosystem model in a 1D framework...
Tipo: Text
Palavras-chave: Biogeochemical modeling; Phytoplankton; Photo-acclimation; Redfield ratio; Internal quota; BATS; Optimization; Micro-genetic algorithm.
Ano: 2013
URL: http://archimer.ifremer.fr/doc/00159/27071/25460.pdf

Les phenomenes d'eaux colorees en Baie de Seine
Provedor de dados: 5
Autores: Paulmier, Gerard; Joly, Jean-pierre.
Colored waters observed along the French coast are the result of growth of a diversity of phytoplanktonic microorganisms. The authors suggest that all species associated with favorable conditions can cause this tide.
Tipo: Text
Palavras-chave: Species diversity; Phytoplankton; Environmental factors; Algal blooms; Red tides.
Ano: 1985
URL: http://archimer.ifremer.fr/doc/1985/acte-1320.pdf

Isolation of 12 microsatellite markers following a pyrosequencing procedure and cross-priming in two invasive cryptic species, Alexandrium catenella (group IV) and A. tamarense (group III) (Dinophyceae)
Provedor de dados: 5
Autores: Laporte, Martin; Shao, Zhaojun; Berrebi, Patrick; Laabir, Mohamed; Abadie, Eric; Faivre, Nicolas; Rieuvilleneuve, Fabien; Masseret, Estelle.
Alexandrium catenella (group IV) and Alexandrium tamarense (group III) (Dinophyceae) are two cryptic invasive phytoplankton species belonging to the A. tamarense species complex. Their worldwide spread is favored by the human activities, transportation and climate change. In order to describe their diversity in the Mediterranean Sea and understand their settlements and maintenances in this area, new microsatellite markers were developed based on Thau lagoon (France) samples of A. catenella and A. tamarense strains. In this study twelve new microsatellite markers are proposed. Five of these microsatellite markers show amplifications on A. tamarense and ten on A. catenella. Three of these 12 microsatellite markers allowed amplifications on both cryptic...
Tipo: Text
Palavras-chave: Invasive species; Phytoplankton; Alexandrium; Dinophyceae; Microsatellite markers; Biogeography.
Ano: 2014
URL: http://archimer.ifremer.fr/doc/00189/30026/29398.pdf

Résultats de la mise en oeuvre des réseaux REPHY et SRN – Zones côtières de la Manche orientale et de la baie sud de la Mer du Nord – Bilan de l’année 2015
Provedor de dados: 5
Autores: Lefebvre, Alain; Perrouchet, Wendy.
The coastal zone of the Nord – Pas de Calais / Picardie showed dysfonctioning patterns of the ecosystem considered to be link to human activities along shores. These results in regular massive development of species, such as the phytoplanktonic seaweed, Phaeocystis sp. which life cycle was partly linked to nutrients availability and consequently to anthropogenic inputs. As part of the evaluation of the influence of continental inputs on the marine environment (nitrates, phosphates,…) and on potential eutrophication processes, of the estimation of the efficiency of the sewage treatments plants in the possible elimination of dumpings and in order to establish a long-term survey to follow up the change in coastal waters quality, the regional nutrients...
Tipo: Text
Palavras-chave: Manche Orientale; Baie sud de la Mer du Nord; Hydrologie; Phytoplancton; Phaeocystis globosa; Eastern English Channel – southern bight of the North Sea; Hydrology; Phytoplankton; Phaeocystis globosa.
Ano: 2016
URL: http://archimer.ifremer.fr/doc/00341/45246/44683.pdf

Résultats de la mise en oeuvre des réseaux REPHY et SRN. Zones côtières de la Manche orientale et de la baie sud de la Mer du Nord - Bilan de l'année 2019
Provedor de dados: 5
Autores: Devreker, David; Grossi, Colette; Lefebvre, Alain.
The coastal zone of the Nord – Pas de Calais / Picardie showed dysfonctioning patterns of the ecosystem considered to be link to human activities along shores. These results in regular massive development of species, such as the phytoplanktonic seaweed, Phaeocystis sp. which life cycle was partly linked to nutrients availability and consequently to anthropogenic inputs. As part of the evaluation of the influence of continental inputs on the marine environment (nitrates, phosphates,…) and on potential eutrophication processes, of the estimation of the efficiency of the sewage treatments plants in the possible elimination of dumpings and in order to establish a long-term survey to follow up the change in coastal waters quality, the regional nutrients...
Tipo: Text
Palavras-chave: Manche Orientale; Baie sud de la Mer du Nord; Hydrologie; Phytoplancton; Phaeocystis globosa; Eastern English Channel – southern bight of the North Sea; Hydrology; Phytoplankton; Phaeocystis globosa.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00643/75545/76465.pdf

Les dinophycées pélagiques et benthiques du Golfe de Gascogne sud de la Bretagne à Arcachon
Provedor de dados: 5
Autores: Paulmier, Gerard.
Les microphytes planctoniques et benthiques du Golfe de Gascogne sont relativement diversifiés. Cette diversification est probablement en rapport avec la situation hydrologique particulière de cette région enrichie par des mélanges de masses d'eau de diverses origines et par des apports continentaux importants. Dans ce contexte, les dinophycées sont nombreuses et variées et occupent toutes les niches écologiques. 230 taxons ont été répertoriés. Quelques espèces sont connues pour provoquer périodiquement des colorations de la mer "eaux rouges" et quelques-unes sont maintenant redoutées pour leur toxicité.
Tipo: Text
Palavras-chave: Zone pélagique; Zone benthique; Phytoplancton; Diversité espèces; Niche écologique; Inventaire floristique; Cycle développement; Répartition géographique; Morphologie; Pyrrophycophyta; Golfe de Gascogne; Bretagne; Landes; Algae; Thallophyta; Océan Atlantique Nord; Océan Atlantique; France; Europe; Aquitaine; Pelagic zone; Benthic zone; Phytoplankton; Species diversity; Niche; Floral survey; Life cycle; Geographic distribution; Morphology; Pyrrophycophyta; Bay of Biscay; Bretagne; Landes; Algae; Thallophyta; North Atlantic; Atlantic Ocean; France; Europe; Aquitaine.
Ano: 1994
URL: http://archimer.ifremer.fr/doc/00260/37097/35613.pdf

Phytoplankton blooms in the Urdaibai estuary during summer: physico-chemical conditions and taxa involved
Provedor de dados: 5
Autores: Orive, E; Iriarte, A; De Madariaga, I; Revilla, M.
In the Urdaibai estuary, despite its small volume in relation to the tidal prism, phytoplankton grows massively in the upper and intermediate zones of the estuary during summer when rainfall is low to moderate. Data obtained in 23 sampling transects along the longitudinal axis of the estuary, undertaken in July 1993 and August 1994, showed three distinct zones in terms of the phytoplankton species composition: in the upper zone the phytoplankton assemblage was dominated by the diatoms Cyclotella spp., the dinoflagellate Glenodinium foliaceum, cryptophytes and euglenophytes; in the intermediate zone the diatom Chaetoceros ceratosporus, the dinoflagellates Peridinium quinquecorne and Prorocentrum minimum and cryptophytes were the most abundant; in the lower...
Tipo: Text
Palavras-chave: Phytoplancton; Hydrologie; Nutriment; Estuaire de Guernica; Phytoplankton; Hydrography; Nutrient; Urdaibai estuary.
Ano: 1998
URL: http://archimer.ifremer.fr/doc/00326/43687/43122.pdf

Measuring production-dissolution rates of marine biogenic silica by Si-30-isotope dilution using a high-resolution sector field inductively coupled plasma mass spectrometer
Provedor de dados: 5
Autores: Fripiat, Francois; Corvaisier, Rudolph; Navez, Jacques; Elskens, Marc; Schoemann, Veronique; Leblanc, Karine; Andre, Luc; Cardinal, Damien.
Regional and seasonal variability of the Si dissolution: production ratios in the surface ocean have not been well assessed. Here, we propose a new method for determining these rates, using the Si-30-isotopic dilution technique with a high-resolution sector field inductively coupled plasma mass spectrometer (HR-SF-ICP-MS). Relative analytical precision of the isotopic measurement is better than 1%, similar to that obtained by thermal ionization-quadrupole mass spectrometry (TIMS). Accuracy and reproducibility of the isotopic measurements have been checked on artificial and natural solutions by intercomparison between two HR-SF-ICP-MS instruments and one TIMS. Measurements of real Si production and dissolution rates are illustrated for two contrasted...
Tipo: Text
Palavras-chave: Isotopic fractionation; Southern ocean; Acid uptake; Waters; Phytoplankton; Environments; Biosilica; Recovery; Balance; Tracer.
Ano: 2009
URL: https://archimer.ifremer.fr/doc/00205/31607/30033.pdf

First Comprehensive Quantitative Multi-Parameter Assessment of the Eutrophication Status from Coastal to Marine French Waters in the English Channel, the Celtic Sea, the Bay of Biscay, and the Mediterranean Sea
Provedor de dados: 5
Autores: Lefebvre, Alain; Devreker, David.
The first quantitative and comprehensive assessment of the eutrophication status from coastal to offshore French waters was performed within the Marine Strategy Framework Directive (MSFD descriptor 5) for the English Channel, the southern bight of the North Sea, the Celtic Seas, the Bay of Biscay and the Western Mediterranean Sea. Based on a combination of different data sources (in situ, satellite, and modeling products), a fully-integrated dataset was generated over the period 2010–2016. Using the best available knowledge on the eutrophication process and definition, the assessment procedure was implemented considering nutrient pressures, and direct and indirect effects of excessive inputs. The different steps of the assessment were: (i) Establishment of...
Tipo: Text
Palavras-chave: Eutrophication; Assessment; Marine Strategy Framework Directive (MSFD); Water Framework Directive (WFD); Oslo and Paris Convention (OSPAR); English Channel; Celtic Seas; Bay of Biscay; Mediterranean Sea; Nutrients; Chlorophyll; Oxygen; Turbidity; Phytoplankton; Macro-algae.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00641/75350/76083.pdf

Small-scale variability of zooplankton pyruvate kinase activity in the Gironde Estuary plume (Atlantic French Coast): A case study under unusually low freshwater discharge
Provedor de dados: 5
Autores: Bergeron, Jean-pierre.
Pyruvate kinase (PK) activity measurements are used to assess the role of carbohydrates in global feeding of mesozooplankton communities inhabiting an estuary plume. As a consequence of a remarkably low freshwater discharge rate, the sea surface layers of the area under estuarine influence showed a very moderate salinity fall and a nearly total depletion in nitrates, whereas higher levels of these nutrients were found in deeper, more saline, layers. Small-scale PK activity variations in mesozooplankton appear to be closely correlated to nitrate integration values within the water column. The results were analysed in comparison with literature reports. The study produced a coherent overall interpretation, which strongly supports the reliability of this new...
Tipo: Text
Palavras-chave: Gironde Estuary; Bay of Biscay; Pyruvate kinase; Pyruvate kinase; Carbohydrates; Zooplankton; Phytoplankton; Chlorophyll; Inorganic nutrients.
Ano: 2006
URL: http://archimer.ifremer.fr/doc/2006/publication-1745.pdf

Les espèces phytoplanctoniques toxiques et nuisibles sur le littoral français de 1984 à 1995, résultats du REPHY (réseau de surveillance du phytoplancton et des phycotoxines)
Provedor de dados: 5
Autores: Belin, Catherine; Raffin, Bernard.
This document presents the results obtained through the French Phytoplankton and Phycotoxins Monitoring Network (REPHY), concerning the presence of toxic and harmful phytoplankton species along the French coast, from 1984 to 1995.  The network REPHY is briefly described. Then the different species, and their associated events, are reviewed : first, species toxic to shellfish consumers, e.g. Dinophysis spp. and Alexandrium minutum, which respectively produce diarrheic and paralytic toxins ; then, species which are toxic or harmful for marine fauna (fish, shellfish). The monitoring results are preceded by the main knowledge on taxonomy, distribution, biology, ecology and toxicity of the concerned species.  A final synthesis illustrates the distribution of...
Tipo: Text
Palavras-chave: Phytoplancton; Phycotoxines; Surveillance; Espèces toxiques; Espèces nuisibles; Dinophysis; Alexandrium; DSP; PSP; Secteurs fermés; Phytoplankton; Phcotoxins; Monitoring; Toxic species; Harmful species; Dinophysis; Alexandrium; DSP; PSP; Closed areas.
Ano: 1998
URL: http://archimer.ifremer.fr/doc/00094/20514/18184.pdf

Photoacclimatization in the zooxanthellae of Pocillopora verrucosa and comparison with a pelagic algal community
Provedor de dados: 5
Autores: Maritorena, S; Payri, C; Babin, M; Claustre, H; Bonnafous, L; Morel, A; Rodiere, M.
Photoacclimatization of zooxanthellae extracted from the coral Pocillopora verrucoso was studied through the determination of pigments, light absorption and photosynthetic parameters. for samples collected in summer and winter between 1 and 40 m on a northwestern reef of Tahiti (French Polynesia). The same measurements were also performed on phytoplanktonic samples collected at a stable oceanic site north of the island. For the zooxanthellae, the variations with depth of all the parameters were generally of small amplitude. Seasonal differences were also observed. The photosynthetic to non-photosynthetic pigments ratio was higher at depth in both seasons and was higher in winter. The intracellular concentration of chlorophyll a and photosynthetic pigments...
Tipo: Text
Palavras-chave: Zooxanthelles; Photoacclimatation; Pocillopora verrucosa; Phytoplancton; Récifs coralliens; Zooxanthellae; Photoacclimatization; Pocillopora verrucosa; Phytoplankton; Coral reefs.
Ano: 2002
URL: http://archimer.ifremer.fr/doc/00322/43313/42941.pdf

Twenty years of satellite and in situ observations of surface chlorophyll-a from the northern Bay of Biscay to the eastern English Channel. Is the water quality improving?
Provedor de dados: 5
Autores: Gohin, Francis; Van Der Zande, Dimitry; Tilstone, Gavin; Eleveld, Marieke A.; Lefebvre, Alain; Andrieux-loyer, Francoise; Blauw, Anouk N.; Bryère, Philippe; Devreker, David; Garnesson, Philippe; Hernandez Farinas, Tania; Lamaury, Yoann; Lampert, Luis; Lavigne, Héloïse; Menet-nedelec, Florence; Pardo, Silvia; Saulquin, Bertrand.
The variability of the phytoplankton biomass derived from daily chlorophyll-a (Chl-a) satellite images was investigated over the period 1998–2017 in the surface waters of the English Channel and the northern Bay of Biscay. Merged satellite (SeaWiFS-MODIS/Aqua-MERIS-VIIRS) Chl-a was calculated using the OC5 Ifremer algorithm which is optimized for moderately-turbid waters. The seasonal cycle in satellite-derived Chl-a was compared with in situ measurements made at seven coastal stations located in the southern side of the English Channel and in the northern Bay of Biscay. The results firstly showed that the satellite Chl-a product, derived from a suite of space-borne marine reflectance data, is in agreement with the coastal observations. For compliance with...
Tipo: Text
Palavras-chave: Satellite remote-sensing; Ocean colour; Phytoplankton; Chlorophyll-a; English Channel; Bay of Biscay; Eutrophication assessment; European marine strategy framework directive.
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00513/62514/66811.pdf

Manual for using REPHY Data. Information to improve the understanding of REPHY data files available to scientists and the public
Provedor de dados: 5
Autores: Ifremer / ODE / VIGIES. REPHY national coordination &amp; Quadrige administration unit.
REPHY (Observation and Monitoring Network for Phytoplankton and Hydrology in coastal waters) is a network implemented by Ifremer. The data acquired by REPHY have been banked since 1987 in the Quadrige database. This manual is intended for users of REPHY data, which are made available on the internet from SEANOE. The Quadrige database is a component of the French Water Information System and its mission is to manage and exploit data from numerous coastal monitoring networks. SEANOE (Sea scientific open data publication) is a publisher of scientific data in the field of marine sciences. The REPHY dataset available in SEANOE makes available all REPHY data for the French metropolis, for years prior to the current year, in the form of fixed files, with an...
Tipo: Text
Palavras-chave: REPHY; Data; Quadrige; SEANOE; DOI; Phytoplankton; Hydrology; Physico‐chemical measurements; Coastal waters.
Ano: 2017
URL: http://archimer.ifremer.fr/doc/00409/52017/52675.pdf

Essai d'aptitude par comparaison Inter-analystes pour l'évaluation des performances en identification et dénombrement du phytoplancton marin. Rapport d'évaluation des compétences des analystes du phytoplancton dans le cadre du réseau d'observation et de surveillance du phytoplancton et de l'hydrologie (REPHY) mis en oeuvre par l'Ifremer
Provedor de dados: 5
Autores: Neaud-masson, Nadine; Brun, Melanie; Chomerat, Nicolas.
The determination of phytoplankton species and the estimation of their abundance in the context of the Phytoplankton and Hydrology Monitoring and Surveillance Network, implemented by Ifremer (REPHY), is based in 2017 on 21 analysts spread over 12 sites. Proficiency testing by inter-laboratory or inter-analyst comparison is used to evaluate the performance of laboratories or analysts on specific skills. An International Phytoplankton Inter-comparison (IPI) is organized annually by the Marine Institute Phytoplankton unit of Galway (Ireland), to evaluate marine phytoplankton identification and enumeration performance. The IPI is implementing its inter-comparison exercises through the Marine Institute Ireland in cooperation with the Intergovernmental...
Tipo: Text
Palavras-chave: Phytoplancton; Comparaison Inter-Laboratoire; CIL; Comparaison Inter-Analyste; CIA; Essai d’aptitude; Phytoplankton; Inter-Laboratory Comparison; CIL; Inter-Analyst Comparison; CIA; Aptitude Test; International Phytoplankton Inter-comparison; IPI.
Ano: 2018
URL: https://archimer.ifremer.fr/doc/00436/54797/56255.pdf

Biogeochemical modelling in the Bay of Seine (France): an improvement by introducing phosphorus in nutrient cycles
Provedor de dados: 5
Autores: Guillaud, Jean-francois; Andrieux-loyer, Francoise; Menesguen, Alain.
As part of the French National Programme for Coastal Oceanography, this paper focuses on improvement of biogeochemical modelling in the: Bay of Seine (Eastern Channel), by introducing phosphorus in nutrient cycles. The Bay of Seine receives the Seine river, which exhibits very high nutrient concentrations, and this coastal zone constitutes a typical case of eutrophication in a river plume area. In terms of analyses, sequential extraction and analysis of sedimentary phosphorus were used in order, to measure various forms of particulate phosphorus in suspended matter and sediment (calcium-bound phosphate, Fe/Al-bound phosphate, exchangeable phosphate and organic phosphorus). In the modelling approach, the Bay is divided into 42 boxes and a two-layer,...
Tipo: Text
Palavras-chave: Bay of Seine; Phytoplankton; Phosphorus; River plume; Biological two layer box model.
Ano: 2000
URL: http://archimer.ifremer.fr/doc/2000/publication-462.pdf

Addressing the measurement of particulate organic and inorganic phosphorus in estuarine and coastal waters
Provedor de dados: 5
Autores: Labry, Claire; Youenou, Agnes; Delmas, Daniel; Michelon, Pascale.
The speciation of particulate phosphorus (TPP) into inorganic (PIP) and organic phosphorus (POP), has been scarcely investigated in suspended particulate matter (SPM), contrary to numerous sediment studies. This work evaluates the actual capacity of methods for TPP, POP and PIP determination in SPM to measure efficiently and specifically each pool. Methods were tested on a range of plankton-associated organic and inorganic P compounds, on microalgal cultures and estuarine samples. Then results are specifically discussed reviewing P speciation in phytoplankton. For TPP analysis, the method of Solorzano and Sharp (1980) is recommended compared with that of Aspila et al. (1976), originally dedicated to sediment, as there is one step less, the protocol is more...
Tipo: Text
Palavras-chave: Phosphorus; Speciation; Waters; Phytoplankton; HTC; CWO.
Ano: 2013
URL: http://archimer.ifremer.fr/doc/00149/26046/26385.pdf

Phytoplankton chlorophyll a distribution and water column stability in the central Atlantic Ocean
Provedor de dados: 5
Autores: Agusti, S; Duarte, Cm.
The relationship between the vertical distribution of phytoplankton chlorophyll a and the physical structure of the upper central Atlantic Ocean was investigated based on results from a cruise across the tropical Atlantic (27 degrees N to 36 degrees S). The thermocline was very sharp and shallow in the northern part of the transect, off the coast of Mauritania and Senegal, and deepened progressively to reach &gt; 150 m deep between 20 degrees S and 30 degrees S. There was a deep chl a maximum associated with the thermocline throughout the transect, reaching chl a concentrations up to 50 fold greater than those in surface waters. The chl a concentration was greatest off the NW African coast and declined towards the south, parallel to a progressive deepening...
Tipo: Text
Palavras-chave: Chlorophylle; Phytoplancton; Stabilité verticale; Océan Atlantique central; Chlorophyll; Phytoplankton; Water column stability; Central Atlantic Ocean.
Ano: 1999
URL: http://archimer.ifremer.fr/doc/00325/43620/43311.pdf

Heterotrophic Bacteria Show Weak Competition for Nitrogen in Mediterranean Coastal Waters (Thau Lagoon) in Autumn
Provedor de dados: 5
Autores: Trottet, Aurore; Leboulanger, Christophe; Vidussi, Francesca; Pete, Romain; Bouvy, Marc; Fouilland, Eric.
The importance of heterotrophic bacteria relative to phytoplankton in the uptake of ammonium and nitrate was studied in Mediterranean coastal waters (Thau Lagoon) during autumn, when the Mediterranean Sea received the greatest allochthonous nutrient loads. Specific inhibitors and size-fractionation methods were used in combination with isotopic N-15 tracers. NO3 (-) and NH4 (+) uptake was dominated by phytoplankton (60 % on average) during the study period, which included a flood event. Despite lower biomass specific NH4 (+) and NO3 uptake rates, free-living heterotrophic bacteria contributed significantly (&gt; 30 %) to total microbial NH4 (+) and NO3 (-) uptake rates in low chlorophyll waters. Under these conditions, heterotrophic bacteria may be...
Tipo: Text
Palavras-chave: Bacteria; Phytoplankton; Inhibitors; Size fractionation; Nitrogen uptake; Dissolved inorganic nitrogen.
Ano: 2016
URL: http://archimer.ifremer.fr/doc/00314/42497/41907.pdf

Choix de products pour lutter contre la pollution du milieu marin par les hydrocarbures. III. Toxicite relative de produits a antipetrole sur deux organisme marins.
Provedor de dados: 5
Autores: Alzieu, Claude.
The necessity to combat oil slicks makes it necessary to assess the relative effectiveness and toxicity of dispersal agents used. This is usually done by using individual or groups of indicator organisms. The theory behind the various approaches is outlined, and some considerations are listed for the choice of technique. 2 organisms were chosen - the Portuguese oyster (Crassostrea), and the phytoplankton alga Phaeodactylum tricornutum Bohlin, on which if feeds - and the oyster closing reaction, and level of inhibition of growth under the influence of irritant products was measured. Methods are described, and the results shown for emulsifying, agglomerating and precipitating products. The results are discussed, and the mode of interference of the products...
Tipo: Text
Palavras-chave: Choice of technique; Phytoplankton; Organisms; Toxicity; Oil spills; Pollution.
Ano: 1972
URL: http://archimer.ifremer.fr/doc/1972/publication-2073.pdf

Atlas of modern dinoflagellate cyst distributions in the Black Sea Corridor: From Aegean to Aral Seas, including Marmara, Black, Azov and Caspian Seas
Provedor de dados: 5
Autores: Mudie, Peta J.; Marret, Fabienne; Mertens, Kenneth; Shumilovskikh, Lyudmila; Leroy, Suzanne A. G.
We present the first comprehensive taxonomic and environmental study of dinoflagellate cysts in 185 surface sediment samples from the Black Sea Corridor (BSC) which is a series of marine basins extending from the Aegean to the Aral Seas (including Marmara, Black, Azov and Caspian Seas). For decades, these low-salinity, semi-enclosed or endorheic basins have experienced large-scale changes because of intensive agriculture and industrialisation, with consequent eutrophication and increased algal blooms. The BSC atlas data provide a baseline for improved understanding of linkages between surface water conditions and dinoflagellate cyst (dinocyst) distribution, diversity and morphological variations. By cross-reference to dinocyst occurrences in sediment cores...
Tipo: Text
Palavras-chave: Phytoplankton; Harmful algae; Biodiversity; Paleoceanography; Surface samples.
Ano: 2017
URL: http://archimer.ifremer.fr/doc/00387/49824/50408.pdf

The problems of application of radiocarbon method for estimation of primary production in oligotrophic waters
Provedor de dados: 5
Autores: Krupatkina, D; Berland, B; Maestrini, S.
The errors in primary production estimation by the radiocarbon method may differ from one trophic region to another. Such supposition is based on unequal phytoplanktonic structural characteristics of these regions. These errors are likely to appear rather significant in oligotrophic waters predominated by nano- and ultranano-plankton (the so-called picoplankton). The organic substance of oligotrophic waters is obviously produced by picoplankton for the most part, the need for clarifying possible errors when estimating primary production by the radiocarbon method, which is the purpose of the present work is urgent. For these topics in oligotrophic waters, measurements were carried out in two ways: (1) according to the generally accepted pattern (Sorokin,...
Tipo: Text
Palavras-chave: Methodology; Community composition; Nutrient cycles; Phytoplankton; Ecosystems; Carbon 14; Primary production; Analytical techniques.
Ano: 1984
URL: http://archimer.ifremer.fr/doc/1984/acte-1522.pdf

Distribution et role des composes soufres reduits volatils sur la speciation metallique
Provedor de dados: 5
Autores: Cozic, Amandine.
A sensitive, precise and rapid analytical method was elaborated to measure simultaneously 5 volatile reduced sulfur compounds (VRSC) ; hydrogen sulfide (H2S), carbonyl sulfide (OCS), methane thiol (MeSH), dimethyl sulfide (DMS), dimethyl disulfide (DMDS). The study of VRSC in the Bay of Quiberon highlights seasonal and interannual variations of concentrations in epibenthic zone. H2S analyzed near the sediment water interface (anoxic microzones), is more elevated in summer. The OCS distribution is consistent with a predominant photodegradation in winter and a sedimentary source in summer. The variations of MeSH, DMS and DMDS are correlated with the Dinophyceae abundance. In the Seine estuary, the absence of volatile H2S in the up estuary is explained by the...
Tipo: Text
Palavras-chave: Phytoplankton; Metal speciation; DMS; Sulfur; Phytoplancton; Spéciation métallique; DMS; Soufre.
Ano: 2007
URL: http://archimer.ifremer.fr/doc/2007/these-2687.pdf

Phycotoxin monitoring in France : risk-based strategy and main results (2006-2008)
Provedor de dados: 5
Autores: Belin, Catherine; Amzil, Zouher.
Toxin monitoring is carried out along the coasts of France by a national network, REPHY, which is the National Monitoring Network for Phytoplankton and Phycotoxins. Sampling strategy differs according to the type of zone coastal or offshore and to the family of toxins. For PSP and ASP toxins, monitoring is based on the detection of toxic phytoplankton species. For lipophilic toxins, a systematic analysis of toxins is performed in risk areas during high risk periods. Experimental monitoring for palytoxins has also been conducted along the Mediterranean coast since 2007. The total number of toxin analyses is in the order of 2500 to 3000 per year. The detailed results for each family of toxins showed that the most frequent toxic events for the period from...
Tipo: Text
Palavras-chave: Monitoring; Phytoplankton; Toxin; Sampling; Shellfish; French coasts.
Ano: 2010
URL: http://archimer.ifremer.fr/doc/00077/18821/16398.pdf

Nutrient Patchiness, Phytoplankton Surge-Uptake, and Turbulent History: A Theoretical Approach and Its Experimental Validation
Provedor de dados: 5
Autores: Schapira, Mathilde; Seuront, Laurent.
Despite ample evidence of micro- and small-scale (i.e., millimeter- to meter-scale) phytoplankton and zooplankton patchiness in the ocean, direct observations of nutrient distributions and the ecological importance of this phenomenon are still relatively scarce. In this context, we first describe a simple procedure to continuously sample nutrients in surface waters, and subsequently provide evidence of the existence of microscale distribution of ammonium in the ocean. We further show that ammonium is never homogeneously distributed, even under very high conditions of turbulence. Instead, turbulence intensity appears to control nutrient patchiness, with a more homogeneous or a more heterogeneous distribution observed under high and low turbulence...
Tipo: Text
Palavras-chave: Nutrient patchiness; Turbulence; Phytoplankton; Surge uptake; Nutrient depletion; Turbulent history.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00643/75527/76435.pdf

Regulation of the Phytoplankton Heme b Iron Pool During the North Atlantic Spring Bloom
Provedor de dados: 5
Autores: Louropoulou, Evangelia; Gledhill, Martha; Browningi, Thomas J.; Desai, Dhwani K.; Barraqueta, Jan-lukas Menzel; Tonnard, Manon; Sarthou, Geraldine; Planquette, Helene; Bowie, Andrew R.; Schmitz, Ruth A.; Laroche, Julie; Achterberg, Eric P.
Heme b is an iron-containing co-factor in hemoproteins. Heme b concentrations are low (&lt; 1 pmol L-1) in iron limited phytoplankton in cultures and in the field. Here, we determined heme b in marine particulate material (&gt; 0.7 mu m) from the North Atlantic Ocean (GEOVIDE cruise - GEOTRACES section GA01), which spanned several biogeochemical regimes. We examined the relationship between heme b abundance and the microbial community composition, and its utility for mapping iron limited phytoplankton. Heme b concentrations ranged from 0.16 to 5.1 pmol L-1 (median = 2.0 pmol L-1, n = 62) in the surface mixed layer (SML) along the cruise track, driven mainly by variability in biomass. However, in the Irminger Basin, the lowest heme b levels (SML: median =...
Tipo: Text
Palavras-chave: Heme b; North Atlantic; Phytoplankton; Diatoms; Iron; Limitation; GEOTRACES; GEOVIDE.
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00508/61940/66029.pdf

210Po and 210Pb trophic transfer within the phytoplankton–zooplankton–anchovy/sardine food web: a case study from the Gulf of Lion (NW Mediterranean Sea)
Provedor de dados: 5
Autores: Strady, Emilie; Harmelin-vivien, Mireille; Chiffoleau, Jean-francois; Veron, Alain; Tronczynski, Jacek; Radakovitch, Olivier.
The transfer of 210Po and 210Pb in the food web of small pelagic fishes (from phytoplankton and zooplankton to anchovy Engraulis encrasicolus and sardine Sardina pilchardus) is investigated in the Gulf of Lion (GoL). We present original data of 210Po and 210Pb activity concentrations, C and N stable isotope ratios, measured (i) from different size classes of phytoplankton and zooplankton during spring and winter in different environments of the GoL, and (ii) in two fish species. Significant spatial patterns based on 210Po, 210Pb activity concentrations and 210Po/210Pb ratios in the different plankton size classes are evidenced by hierarchical clustering, both in spring and winter. This variability, also observed for C and N stable isotopes ratios, is...
Tipo: Text
Palavras-chave: Po-210; Pb-210; Phytoplankton; Zooplankton; Pelagic fishes; Mediterranean Sea.
Ano: 2015
URL: https://archimer.ifremer.fr/doc/00255/36609/35264.pdf

Microbial food web structural and functional responses to oyster and fish as top predators
Provedor de dados: 5
Autores: Mostajir, Behzad; Roques, Cecile; Bouvier, Corinne; Bouvier, Thierry; Fouilland, Eric; Got, Patrice; Le Floc'H, Emilie; Nouguier, Jean; Mas, Sebastien; Sempere, Richard; Sime-ngando, Telesphore; Troussellier, Marc; Vidussi, Francesca.
The impact of fish and oysters on components of the pelagic microbial food web (MFW) was studied in a 10 d mesocosm experiment using Mediterranean coastal waters. Two mesocosms contained natural water only ('Controls'), 2 contained natural water with Crassostrea gigas ('Oyster'), and 2 contained natural water with Atherina spp. ('Fish'). Abundances and biomasses of microorganisms (viruses, bacteria, phytoplankton, heterotrophic flagellates, and ciliates) were measured to estimate their contribution to the total microbial carbon biomass. Two MFW indices, the microbial autotroph: heterotroph C biomass ratio (A:H) structural index and the gross primary production: respiration ratio (GPP:R) functional index, were defined. In the Fish mesocosms, selective...
Tipo: Text
Palavras-chave: Microbial food web; Virioplankton; Bacterioplankton; Phytoplankton; Protozooplankton; Crassostrea; Atherina; Autotrophy; Heterotrophy.
Ano: 2015
URL: https://archimer.ifremer.fr/doc/00284/39489/73675.pdf

Dinoflagelles toxiques sur les cotes francaises pendant l'ete 1983. Perturbations des ecosystemes en baie de Vilaine. Analyse des successions phytoplanctoniques precedant l'apparition d'un dinoflagelle toxique.
Provedor de dados: 5
Autores: Pierre, Marie-josé; Lassus, Patrick.
The incidence of phytoplankton communities sequences on toxic dinoflagellate Dinophysis acuminata occurrence was studied in the course of summer 1983, in Vilaine Bay. Despite difficulties in finding obvious relationship between occurrences of that species in the fields and preceding species it nevertheless may be emphasized: 1) a real perturbation of ecosystems is noticeable (rank-frequency diagrams); 2) the amount of sampling stations might be reduced in so far as representative stations are maintained.
Tipo: Text
Palavras-chave: Vilaine Bay; Brittany; France; ANE; Dinophysis acuminata; Ecosystem disturbance; Red tides; Phytoplankton; Ecological succession.
Ano: 1983
URL: http://archimer.ifremer.fr/doc/1983/publication-1806.pdf

An Improved Protocol for Flow Cytometry Analysis of Phytoplankton Cultures and Natural Samples
Provedor de dados: 5
Autores: Marie, Dominique; Rigaut-jalabert, Fabienne; Vaulot, Daniel.
Preservation of cells, choice of fixative, storage, and thawing conditions are recurrent issues for the analysis of phytoplankton by flow cytometry. We examined the effects of addition of the surfactant Pluronic F68 to glutaraldehyde-fixed photosynthetic organisms in cultures and natural samples. In particular, we examined cell losses and modifications of side scatter (a proxy of cell size) and fluorescence of natural pigments. We found that different marine phytoplankton species react differently to the action of Pluronic F68. In particular, photosynthetic prokaryotes are less sensitive than eukaryotes. Observed cell losses may result from cell lysis or from cell adhesion to the walls of plastic tubes that are commonly used for flow cytometry analysis....
Tipo: Text
Palavras-chave: Phytoplankton; Flow cytometry; Preservation; Pluronic F68; Glutaraldehyde.
Ano: 2014
URL: https://archimer.ifremer.fr/doc/00374/48493/48858.pdf

Phytoplancton en baie de Seine. Influence du panache fluvial sur la production primaire
Provedor de dados: 5
Autores: Videau, Christiane; Ryckaert, Mireille; L' Helguen, Stéphane.
Phytoplankton distribution and primary productivity were investigated in the Bay of Seine (eastern English Channel, France) in spring and early summer of 1992 and 1994. In 1992, the horizontal distribution of phytoplankton species was determined over the whole Bay of Seine. In 1994, species distribution and primary productivity were studied along the salinity gradient of the Seine plume and in the neighbouring marine waters. Phytoplankton distribution was characterised by the permanent diatom dominance from early spring to early summer. The spring bloom did not occur uniformly over the bay, but was initiated in the marine waters, in the middle of the bay and progressed towards the coast where it developed, in June, in the diluted waters of the Seine plume....
Tipo: Text
Palavras-chave: Bay of Seine; Primary productivity; Phytoplankton; Baie de Seine; Production primaire; Phytoplancton.
Ano: 1998
URL: http://archimer.ifremer.fr/doc/1998/publication-843.pdf

Eléments nutritifs limitant la biomasse phytoplanctonique d'une lagune tropicale de Côte d'Ivoire. Comparaison des méthodes d'estimation
Provedor de dados: 5
Autores: Dufour, P.; Cremoux, Jl.; Slepoukha, M.
"In vitro" enrichment experiments on natural populations have been used to determine the nutrients controlling the potential biomass of phytoplancton in the Ebrié coastal lagoon. The limiting nutrients were generally nitrogen, phosphorus and carbon, in this order ; in three cases out of eleven, P and N act simultaneously ; in an extreme eutrophication case, N, P and C were all limiting. No effect was observed following addition of metals, vitamins or chelators. The limitations deduced from the enrichment experiments show a. good agreement with the elementary composition of the external medium ; in waters potentially limited by N alone, the dissolved inorganic nutrients have a N : P ratio lower than 25. The agreement is poorer when the sestonic N : P ratio...
Tipo: Text
Palavras-chave: Lagune; Estuaire; Zone tropicale; Phytoplancton; Biomasse; Eléments limitants; Tests biologiques; Composition chimique; Coastal lagoon; Estuary tropical zone; Phytoplankton; Biomass; Limiting nutrients; Bioassay; Chemlcal composition.
Ano: 1979
URL: http://archimer.ifremer.fr/doc/00306/41689/40898.pdf

Phytoplankton Orientation in a Turbulent Ocean: A Microscale Perspective
Provedor de dados: 5
Autores: Basterretxea, G.; Font-munoz, Joan Salvador; Tuval, I.
Phytoplankton are by definition autotrophic microorganisms that passively drift with fluid motion. Accordingly, the traditional view of a turbulence-homogenized phytoplankton distribution in the ocean, where cells randomly organize and interact, is deeply rooted in biological oceanography studies. However, increasing understanding of microscopic processes in the ocean is revealing a world of microscale patterns resulting from cell behaviors and fluid-cell interactions that challenges this vision. Autotrophic cells have developed active (i.e., flagella) and passive (i.e., morphological structures and vesicles) motility mechanisms that allow them different degrees of spatial control. Their complex interaction with the ocean physicochemical landscape commonly...
Tipo: Text
Palavras-chave: Phytoplankton; Microscale; Turbulence; Orientation; Shear.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00621/73261/72476.pdf

Dynamique spatiale et temporelle de la production primaire de l'estuaire de la Seine
Provedor de dados: 5
Autores: Morelle, Jérôme.
The estuaries play an important ecological role and are the site of many human activities because of their strategic position at the interface between continental and marine waters. Seine estuary is characteristic of large anthropized estuaries. Long-term management requires better knowledge of the spatial and temporal dynamics of the estuarine food webs. Phytoplankton and microphytobenthos are the main contributor of primary production (PP) in these ecosystems and are at the basis of trophic food webs. These compartments are often reduced to the chlorophyll concentration and their productivity has never been measured along the Seine estuary. The objective of this study was to estimate the PP of these compartments along the salinity gradient. In order to...
Tipo: Text
Palavras-chave: PAM; ETR; 13C; TEP; EPS; Exopolymeric substances; Phytoplankton; Microphytobenthos; Transparent Exopolymeric Particles.
Ano: 2017
URL: https://archimer.ifremer.fr/doc/00498/60965/64373.pdf

Impact de la salmoniculture marine sur l'environnement en rade de Cherbourg (1993-1995) 1. Eau et Pélagos
Provedor de dados: 5
Autores: Merceron, Michel; Bentley, Daniel; Le Grand, Jacqueline; Lamort-datin, Laure; Kempf, Marc.
The environmental impact of a brown trout farm located in the Grande Rade de Cherbourg (Normandy) is reported. During observations the fish stock evolved within the range of 140 to 350 metric tons. Farm influence was researched on water column through hydrochemistry, phytoplankton, faecal bacteria and, on bottom, through grain size, organic matter, metals, macrobenthos. This report only deals with water column.  Except ammonia, no hydrological parameter seems to be affected, even near to the net pens. Phytoplankton and coliform bacteria were not altered. An extra concentration of ammonia was detected at some tens meters from the raft, with favourable conditions. But generally it was impossible to observe it unless close to the farming structure, downward...
Tipo: Text
Palavras-chave: Channel; Current; Faecal bacteria; Phytoplankton; Hydrology; Impact; Salmonid; Fish farm; Manche; Courant; Bactéries fécales; Phytoplancton; Hydrologie; Impact; Salmonidé; Aquaculture.
Ano: 1997
URL: http://archimer.ifremer.fr/doc/1997/rapport-3342.pdf

Diversity and toxic potential of algal bloom-forming species from Takaroa lagoon (Tuamotu, French Polynesia): a field and mesocosm study
Provedor de dados: 5
Autores: Rodier, M; Longo, S; Henry, K; Ung, A; Lo-yat, Alain; Darius, Ht; Viallon, J; Beker, B; Delesalle, B; Chinain, M.
Pearl farming lagoons are economically important, yet poorly studied ecosystems in French Polynesia. This paper describes a study conducted in 2016 in Takaroa (Tuamotu Archipelago), an atoll recurrently affected by harmful algal bloom (HAB) events. The objectives were to gain insight into phytoplankton community composition, identify the main bloom-forming species and investigate their potential for toxicity. A mesocosm approach was used to assess the response of phytoplankton communities to 3 nutrient treatments: Conway with Si, Si-depleted f/2 and a commercial N-P fertilizer. In total, 87 morpho-species were described from Takaroa lagoon, with dinoflagellates as the most diverse group. Diatoms (Extubocellulus sp., Cylindrotheca closterium, Nitzschia...
Tipo: Text
Palavras-chave: Phytoplankton; Taxonomy; Mesocosm; Bloom-forming species; Toxicity; French Polynesian lagoons.
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00499/61059/64509.pdf

Etudes méthodologiques développées à l’échelle nationale. Action 5 bis. Bilan 2013 du GT experts Phytoplancton et hydrologie. Rapport annuel
Provedor de dados: 5
Autores: Belin, Catherine; Miossec, Laurence.
The working group Phytoplankton – hydrology was established during the implementation of the Water Framework Directive (WFD) with Catherine Belin, Mireille Ryckaert and Anne Daniel (Ifremer) as leaders. It met several times at that time and then was reactivated in 2012. Discussions in the working group along the year 2013 have been reported in this document. They were related to class boundaries, turbid water in transitional waters and reference sites.
Tipo: Text
Palavras-chave: Groupe de travail; Phytoplancton; Hydrologie; DCE; Grilles de qualité; Masses d’eau turbides; Sites de référence; Working group; Phytoplankton; Hydrology; WFD; Class boundaries; Turbid water; Reference sites.
Ano: 2014
URL: http://archimer.ifremer.fr/doc/00394/50493/51229.pdf

Survival of bacteria and phytoplankton in ship's ballasts
Provedor de dados: 5
Autores: Masson, Daniel; Piquet, Jean-come; Courtois, Olivier.
Billions of tons of ballast water are lreased world-wide every year. Living marine, brackish or freshwater organisms, including those noxioux or unwanted, can travel by that way from a part of the world to another. A successful introduction needs : 1) survival during the pumping process 2) survival in ships' ballasts 3) survival and repreoduction in the new environment. To assess the survival conditions in ship's ballasts, a small scale pilot system has been built (MARTOB project), more realistic than laboratory vials and easier to handle than a real ballast. Bacteria and phytoflagellates coming from ship's sampling or from cultures were introduced in the system ; their survival in several waters or sediments are studied, a useful method to assess the...
Tipo: Text
Palavras-chave: Ballast water; Bacteria; Phytoplankton.
Ano: 2005
URL: http://archimer.ifremer.fr/doc/00074/18535/16079.pdf

Ecologie alimentaire de l'huitre Crassostrea gigas : dynamiques des compositions isotopiques naturelles
Provedor de dados: 5
Autores: Malet, Nathalie.
Trophic transfers of particulate organic matter sources to the Pacific oyster Crassostrea gigas were investigated in the oyster farming bay of Marennes-Oléron for two years. Stable isotope ratios of carbon and nitrogen were used to trace the origin and fate of primary production and organic matter inputs into the bay, and to depict trophic transfers to oysters that were experimentally reared according to traditional methods. Characterizing particulate organic matter sources available for oysters utilized a combination of hydrobiological parameters and stable isotope ratios. Processes of food incorporation by oysters were described for five organs such as gills, digestive gland, mantle, muscle and gonads, and were interpreted taking into account...
Tipo: Text
Palavras-chave: Microphytobenthos; Phytoplankton; Organs; Trophic discrimination; Tissue turnovers; Particulate organic matter; Marennes Oléron Bay; Pertuis Charentais; Stable isotopes; Pacific oysters; Crassostrea gigas; Microphytobenthos; Phytoplancton; Hydrologie; Organes; Enrichissement trophique; Renouvellement tissulaire; Matière organique particulaire; Bassin de Marennes Oléron; Pertuis Charentais; Isotopes stables; Crassostrea gigas; Huître creuse.
Ano: 2005
URL: http://archimer.ifremer.fr/doc/2005/these-2089.pdf

Guide pratique à l'usage des analystes du Réseau National de Surveillance du phytoplancton
Provedor de dados: 5
Autores: Nezan, Elisabeth; Piclet, Guy; Grossel, Hubert.
This work is based on optical microscopic photographs. It helps to the identification of the phytoplanktonic organisms from the french coastal zones and to the normalization of the results of microscopic analysis.  1)Dinophyceae and dinoflagellate 2)Bacillariophyceae or diatomophyceae,named diatoms 3)Others classes
Tipo: Text
Palavras-chave: Dinoflagellate; Diatoms; France; Coastal zones; Identification; Phytoplankton.
Ano: 1997
URL: https://archimer.ifremer.fr/doc/00502/61382/65020.pdf

Les elements nutritifs en baie de Seine
Provedor de dados: 5
Autores: Aminot, Alain; Kerouel, Roger; Mauvais, J.
Seasonal variations of dissolved nutrient concentrations are reported in this paper. Impacts of freshwater are investigated by the study of dilution, nutrient quantity, and relation with phytoplanktonic growth.
Tipo: Text
Palavras-chave: Silicon; Phosphorus; Nitrogen; Seasonal variations; Dilution; Primary production; Eutrophic waters; Phytoplankton; River discharge; Coastal zone; Nutrients (mineral).
Ano: 1985
URL: http://archimer.ifremer.fr/doc/1985/acte-1295.pdf

Responses of summer phytoplankton biomass to changes in top-down forcing: Insights from comparative modelling
Provedor de dados: 5
Autores: Maar, Marie; Butenschon, Momme; Daewel, Ute; Eggert, Anja; Fan, Wei; Hjollo, Solfrid S.; Hufnagl, Marc; Huret, Martin; Ji, Rubao; Lacroix, Genevieve; Peck, Myron A.; Radtke, Hagen; Sailley, Sevrine; Sinerchia, Matteo; Skogen, Morten D.; Travers-trolet, Morgane; Troost, Tineke A.; Van De Wolfshaar, Karen.
The present study describes the responses of summer phytoplankton biomass to changes in top-down forcing (expressed as zooplankton mortality) in three ecosystems (the North Sea, the Baltic Sea and the Nordic Seas) across different 3D ecosystem models. In each of the model set-ups, we applied the same changes in the magnitude of mortality (±20%) of the highest trophic zooplankton level (Z1). Model results showed overall dampened responses of phytoplankton relative to Z1 biomass. Phytoplankton responses varied depending on the food web structure and trophic coupling represented in the models. Hence, a priori model assumptions were found to influence cascades and pathways in model estimates and, thus, become highly relevant when examining ecosystem pressures...
Tipo: Text
Palavras-chave: Plankton functional types; Trophic cascades; Zooplankton mortality; Phytoplankton; Ensemble modelling.
Ano: 2018
URL: https://archimer.ifremer.fr/doc/00433/54466/56083.pdf

Effect of P depletion on the functional pools of diatom carbohydrates, and their utilization by bacterial communities
Provedor de dados: 5
Autores: Labry, Claire; Delmas, Daniel; Moriceau, Brivaela; Gallinari, Morgane; Quere, Julien; Youenou, Agnes.
Phosphorus (P) limitation of phytoplankton growth is known to affect the accumulation and release of carbohydrates (CHO) by micro-algae. However, relatively little is known about the fate of algal exudates, notably their bacterial degradation. The CHO chemical characterization is also not exhaustive, especially in ‘functional’ pools relevant for phytoplankton physiology (particulate reserve [R] or structural [S] CHO) and for bacterial degradation (dissolved mono- [MDCHO] and polysaccharides [P-DCHO]). In this study, we investigated how P depletion and repletion affect the CHO composition in diatom Thalassiosira weissflogii cultures, and the shortterm response of free and diatom-attached bacteria in terms of abundance and potential βglucosidase activity...
Tipo: Text
Palavras-chave: P limitation; Phytoplankton; Diatom; Bacteria; Mineralization; Carbohydrate; Glucosidase.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00628/74045/73532.pdf

Nitrogenous organic substances as potential nitrogen sources, for summer phytoplankton in the Gulf of Riga, eastern Baltic Sea
Provedor de dados: 5
Autores: Maestrini, Serge; Balode, Maija; Bechemin, Christian; Purina, Ingrida.
To investigate whether uptake of dissolved organic compounds might favour the growth potential of toxic cyanobacteria and dinoflagellates, surface water was collected in late July 1997 in the Gulf of Riga, and enriched with different nitrogen sources. (1) Organic substances were added (25 mu M N) under P-, Si- and Fe-replete conditions. Urea sustained a biomass increase (protein content) 20% greater than that with NH sub(4) super(+). Glycine, hypoxanthine and putrescine gave only 50% of the biomass obtained with NH sub(4) super(+). Glutamic acid and spermine supported growth in only one case each, and guanine in none. (2) The &gt;1000 dalton fraction of dissolved organic matter (DOM) taken from the Daugava River was provided at concentrations of 5, 15 and...
Tipo: Text
Palavras-chave: Phytoplankton; Terrigenous DON; Nitrogenous nutrients; Baltic Sea.
Ano: 1999
URL: http://archimer.ifremer.fr/doc/00173/28437/26769.pdf

Trajectoires d’évolution des communautés phytoplanctoniques au cours du processus de restauration écologique des milieux lagunaires méditerranéens
Provedor de dados: 5
Autores: Leruste, Amandine.
Located at the interface between marine and continental systems, coastal lagoons are among the most diverse and productive ecosystems. These semi-enclosed ecosystems are very vulnerable to nutrient enrichment. In the Languedoc-Roussillon region, anthropogenic pressures have profoundly damaged the coastal lagoons, especially those belonging to the Palavasian complex close to Montpellier. The latter lagoons have been affected by high nutrient loadings from the sewage treatment plant of the Montpellier agglomeration. This resulted in a trophic gradient among the eight lagoons in the complex, from mesotrophy to hypertrophy, with altered primary producer communities by favoring the predominance of the phytoplankton compartment.The phytoplankton responds very...
Tipo: Text
Palavras-chave: Phytoplancton; Biodiversité; Eutrophisation; Restauration; Résilience; Lagunes méditerranéennes; Phytoplankton; Biodiversity; Eutrophication; Restoration; Resilience; Mediterranean lagoons.
Ano: 2016
URL: https://archimer.ifremer.fr/doc/00498/60930/64324.pdf

Amélioration des productions phytoplanctoniques en écloserie de mollusques : caractérisation des microalgues fourrage
Provedor de dados: 5
Autores: Robert, Rene; Chretiennot-dinet, Marie-josèphe; Kaas, Raymond; Martin-jezequel, Véronique; Moal, Jeanne; Le Coz, Jean-rene; Nicolas, Jean-louis; Bernard, Eudes; Connan, Jean-paul; Le Dean, Loic; Le Gourrierec, Gaetane; Leroy, Bertrand; Quere, Claudie.
in mollusc hatcheries. Consequently, we assessed themost commonly used species to establish their growth and size profiles, their cytomorphological, biochemical, biomolecular identification as well as their cytometer signs, and also their ability to grow under extreme conditions of temperature and salinity. This work aimed at matching the conformity of the strains used in Argenton (dispatched to most of the French commercial hatcheries) to those of a referenced culture collection. A previous screening preceded this study, because of the 45 species and/or clones held originally, Argenton kept no more than 15 species. As most of the latter are also represented in referenced collection, our strains are therefore correctly identified. On the other hand, the...
Tipo: Text
Palavras-chave: Ecological limits; Biomolecular profile; Flow cytometry; Biochemical composition; Cytomorphology; Phytoplankton; Mollusc; Hatchery; Ecotolérance; Profil biomoléculaire; Cytométrie en flux; Composition biochimique; Cytomorphologie; Phytoplancton; Mollusques; Ecloserie.
Ano: 2004
URL: http://archimer.ifremer.fr/doc/2004/rapport-1546.pdf

Behaviour of arsenic on the continental shelf off the Gironde estuary: role of phytoplankton in vertical fluxes during spring bloom conditions
Provedor de dados: 5
Autores: Michel, Pierre; Boutier, Bernard; Herbland, Alain; Averty, Bernard; Artigas, Lf; Auger, Dominique; Chartier, E.
The arsenic (As) cycle in the marine environment is known to be sensitive to biological activity. Within the scope of the National Coastal Oceanography Program, we undertook a specific study of the behaviour of this element in a water column on the continental shelf of the Bay of Biscay off the Gironde estuary during two oceanographic cruises conducted in May 1994 and May 1995. Various chemical forms were measured: arsenite (As3), at-senate (As5), monomethylarsenic (MMA), dimethylarsenic (DMA) and dissolved total As after ultraviolet mineralization. The net flux of total As from the Gironde estuary was evaluated as well as its effect on the concentration in surface marine waters. The vertical profiles in the coastal zone during a period of active primary...
Tipo: Text
Palavras-chave: Arsenic; Phytoplankton; Speciation; Gironde plume; Biscay Bay.
Ano: 1998
URL: http://archimer.ifremer.fr/doc/1998/publication-851.pdf

The role of phosphorus on planktonic production of the Gironde plume waters in the Bay of Biscay
Provedor de dados: 5
Autores: Labry, Claire; Herbland, Alain; Delmas, Daniel.
More and more studies emphasize the status of phosphorus (P) as the principal limiting nutrient of phytoplankton growth, especially in coastal waters under the influence of freshwater discharges. The purpose of the present paper is to investigate the role of P on planktonic production in the waters influenced by the Gironde discharges; the Gironde being one of the two largest rivers on the French Atlantic coast. The survey is based on several cruises made in 1998 and 1999. Two different patterns were observed for waters with salinity below and above 34.5. For waters with salinity &lt;34.5. P was found to be the first limiting nutrient of winter and spring phytoplankton blooms, based on undetectable phosphate (&lt;20 nM), high NO3 : PO4 ratios, typically...
Tipo: Text
Palavras-chave: Bay of Biscay; River plume; Salinity; Water quality analysis; Phytoplankton; Planktonic production.
Ano: 2002
URL: http://archimer.ifremer.fr/doc/2002/publication-690.pdf

Phytoplankton phosphorus limitation in a North Atlantic coastal ecosystem not predicted by nutrient load
Provedor de dados: 5
Autores: Trommer, Gabriele; Leynaert, Aude; Klein, Cecile; Naegelen, Aurore; Beker, Beatriz.
Phytoplankton nutrient limitation patterns were investigated in an anthropogenically influenced coastal ecosystem with a high nutrient load. Weekly nutrient limitation bioassays, and water chemistry and stoichiometry measurements were performed in the Bay of Brest, France, from February to July 2011. Each limitation bioassay included phosphorus, nitrogen, silicate and all possible combined nutrient additions, and lasted over 72 h. Results showed that the phytoplankton community experienced a general P limitation from March to July. N limitation alone was observed only during 1 week in early March. Subsequently, all limitation bioassays revealed primary P limitation, indicated by significantly increased growth rates in all samples containing P additions....
Tipo: Text
Palavras-chave: Phytoplankton; Stoichiometry; Bioassays; Nutrient limitation; Coastal ecosystem.
Ano: 2013
URL: https://archimer.ifremer.fr/doc/00368/47947/48023.pdf

PCB concentrations in plankton size classes, a temporal study in Marseille Bay, Western Mediterranean Sea
Provedor de dados: 5
Autores: Tiano, Marion; Tronczynski, Jacek; Harmelin-vivien, Mireille; Tixier, Celine; Carlotti, Francois.
PCB levels in plankton were investigated in the Bay of Marseille, Western Mediterranean Sea, between September 2010 and October 2011. Concentrations of PCB congeners (CB 18, CB 52, CB 101, CB 118, CB 138, CB 153, CB 180) were determined in three plankton size-classes (60–200, 200–500 and 500–1000 μm) together with different parameters: chlorophyll content, plankton dry-weight biomass, carbon and nitrogen stable isotope ratios and plankton-community structure. The ∑PCB7 concentrations ranged between 14.2 and 88.1 ng g−1 d.w., for all size classes and all sampling periods. The results do not show the biomass dilution effect and indicate moderate but significant biomagnification with plankton trophic position estimated by δ15N signatures. Equilibrium with...
Tipo: Text
Palavras-chave: PCBs; Phytoplankton; Zooplankton; Bioaccumulation; Coastal; Bay of Marseille.
Ano: 2014
URL: https://archimer.ifremer.fr/doc/00218/32881/31371.pdf

Major shifts in the phytoplankton community (1980-1994) in the Romanian Black Sea
Provedor de dados: 5
Autores: Mihnea, Pe.
Between 1980 and 1994, thirteen marine transects off the Romanian coast were sampled at monthly intervals from February to October at 5, 10 and 20 m depths, together with control sites situated 10, 20 and 30 miles from the coast. The present paper is based on 2,864 phytoplankton and 1,588 pigment samples. In this long data set, consistent patterns of phytoplanktonic community structure were identified: 1) The community maintained the capacity to produce huge biomasses (max. 20,163-205,084 or even 422,140 x 10(3) cell l(-1)), but an increased tendency to develop in ''patches'' became much more evident; 2) The frequency and cell density of nannoplanktonic species increased up to bloom phenomena: Apedinella (21.5), Mantoniella (5.97), Hyalobrion (13.25), and...
Tipo: Text
Palavras-chave: Phytoplankton; Nano-ultraplankton; Chryso-cryptophyta.
Ano: 1997
URL: http://archimer.ifremer.fr/doc/00093/20385/18052.pdf

Etude de la dynamique et de la composition du phytoplancton via l'approche des pigments appliquée au littoral normand
Provedor de dados: 5
Autores: Hernandez Farinas, Tania; Menet-nedelec, Florence; M Zari, Lotfi; Courtay, Gaelle; Lampert, Luis.
We show the results of pigment analysis in High Performance Liquid Chromatography (HPLC), sampled between 2016 and 2017, on four sampling points in Normandy.
Tipo: Text
Palavras-chave: Phytoplancton; Pigments; Rapports pigmentaires; REPHY/RHLN; Environnement; Classes de taille; Phytoplankton; Pigments; Pigment ratio; REPHY/RHLN; Environment; Size classes.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00687/79903/82866.pdf

Effects on phytoplankton growth of dissolved substances produced by fish farming
Provedor de dados: 5
Autores: Arzul, Genevieve; Clement, Alejandro; Pinier, Anne.
Fish Farming enriches the water column in dissolved organic and inorganic material. These materials excreed by the fish, elutriate from uneaten food and derive from other polluting substances. Ratios of the organic/inorganic forms of substances (for example N and P) are thus modified. Such perturbations in turn affect phytoplankton development. From in vitro analyses and tests of water taken from a turbot rearing tank, we show the changes in seawater chemical composition produced as well as the way growth was modified in three phytoplankton species: the diatom, Chaetoceros gracile, and the dinoflagellates, Gymnodinium cf. nagasakiense and Alexandrium minutum. Elutriates from the granules used for feed (0.1 to 100 mg.l(-1)) were found to be stimulating,...
Tipo: Text
Palavras-chave: Antibiotique; Fécès; Aliment; Aquaculture; Régulation de croissance; Phytoplancton; Urée; Antibiotic; Faeces; Feed; Fish farming; Growth regulation; Phytoplankton; Urea.
Ano: 1996
URL: http://archimer.ifremer.fr/doc/00188/29887/28340.pdf

Phytoplankton seasonal dynamics in a Mediterranean coastal lagoon: emphasis on the picoeukaryote community
Provedor de dados: 5
Autores: Bec, Béatrice; Husseini Ratrema, Julie; Collos, Yves; Souchu, Philippe; Vaquer, André.
The dynamics of the phytoplankton community were investigated in a marine coastal lagoon (Thau, NW Mediterranean) from February 1999 to January 2000. Dilution experiments, chlorophyll a (Chl a) size-fractionation and primary production measurements were conducted monthly. Maximum growth and microzooplankton grazing rates were estimated from Chl a biomass fractions to separate pico- from nano- and microphytoplankton and by flow cytometry to distinguish between picoeukaryotes and picocyanobacteria. In spring, the phytoplankton community was dominated by Chaetoceros sp. and Skeletonema costatum, which represented most of biomass (B) and primary production (P). Nano- and microphytoplankton growth was controlled by nutrient availability and exceeded losses due...
Tipo: Text
Palavras-chave: Coastal lagoon; NW Mediterranean; Picoeukaryote; Phytoplankton.
Ano: 2005
URL: http://archimer.ifremer.fr/doc/2005/publication-726.pdf

A spatially explicit ecosystem model of seston depletion in dense mussel culture
Provedor de dados: 5
Autores: Grant, J; Bacher, Cedric; Cranford, P; Guyondet, T; Carreau, M.
A fully-coupled biological-physical-chemical model of a coastal ecosystem was constructed to examine the impact of suspended mussel culture on phytoplankton biomass in Tracadie Bay, Prince Edward Island, Canada. Due to the extent of mussel culture there, we hypothesised that shellfish filtration would control the concentration and distribution of phytoplankton and other suspended particles in the bay. Circulation was delineated with a tidally-driven 2D numerical model and used to drive an ecosystem model with a focus on pelagic components including phytoplankton production, nutrients, detritus, and mussels. The benthos were treated as a sink. Nutrients and seston were forced by tidal exchange and river input, with phytoplankton additionally forced by...
Tipo: Text
Palavras-chave: Towed sensors; Nutrient dynamics; Circulation model; Phytoplankton; Carrying capacity; Shellfish aquaculture; Estuaries; Ecosystem model.
Ano: 2008
URL: http://archimer.ifremer.fr/doc/2008/publication-6951.pdf

Modelling ecological change over half a century in a subtropical estuary: impacts of climate change, land-use, urbanization and freshwater extraction
Provedor de dados: 5
Autores: Condie, Scott A.; Hayes, Donna; Fulton, Elizabeth A.; Savina, Marie.
The Clarence River Estuary is the largest estuary in southeast Australia, with an extensive floodplain encompassing multiple river channels and a large coastal lagoon. It is the focus of major commercial and recreational fisheries and there is pressure to divert its freshwater inputs for agricultural and domestic uses. We used a spatial biogeochemical model to simulate the variability and evolution of this system on timescales from days to decades over the past half century. Like most tropical and subtropical estuaries, the Clarence River Estuary is strongly influenced by river discharge, sediment and nutrient loads. Given the high nutrient loads arriving from the upper catchment, plankton biomasses in the model were typically limited by flushing through...
Tipo: Text
Palavras-chave: Coastal lagoon; Flushing; Land-use; Climate impacts; Nutrients; Phytoplankton; Zooplankton.
Ano: 2012
URL: http://archimer.ifremer.fr/doc/00175/28673/27113.pdf

Seasonal variation of riverine nutrient inputs in the northern Bay of Biscay (France), and patterns of marine phytoplankton response
Provedor de dados: 5
Autores: Guillaud, Jean-francois; Aminot, Alain; Delmas, Daniel; Gohin, Francis; Lunven, Michel; Labry, Claire; Herbland, Alain.
Seasonal variations in nutrient inputs are described for the main rivers (Loire and Vilaine) flowing into the northern Bay of Biscay. The river plumes are high in N/P ratio in late winter and spring, but not in the inner plume during the summer. Conservative behavior results in most nutrients entering the estuary and eventually reaching the coastal zone. Temporal and spatial aspects of phytoplankton growth and nutrient uptake in the northern Bay of Biscay distinguish the central area of salinity 34 from the plume area. The first diatom bloom appears offshore in late winter, at the edge of the river plumes, taking advantage of haline stratification and anticyclonic "weather windows." In spring, when the central area of the northern shelf is...
Tipo: Text
Palavras-chave: Northern Bay of Biscay; Phytoplankton; Continental shelf; Riverine inputs; Nutrients.
Ano: 2008
URL: http://archimer.ifremer.fr/doc/2007/publication-2354.pdf

The paralytic shellfish toxin, saxitoxin, enters the cytoplasm and induces apoptosis of oyster immune cells through a caspase-dependent pathway
Provedor de dados: 5
Autores: Abikhalil, Celina; Finkelstein, Darren S.; Conejero, Genevieve; Du Bois, Justin; Destoumieux-garzon, Delphine; Rolland, Jean-luc.
Exposure of the toxin-producing dinoflagellate Alexandrium catenella (A. catenella) was previously demonstrated to cause apoptosis of hemocytes in the oyster species Crassostrea gigas. In this work, a coumarin-labeled saxitoxin appeared to spread throughout the cytoplasm of the hemocytes. PSTs, including saxitoxin, were also shown to be directly responsible for inducing apoptosis in hemocytes, a process dependent on caspase activation and independent of reactive oxygen species (ROS) production. A series of in vitro labeling and microscopy experiments revealed that STX and analogs there of induced nuclear condensation, phosphatidylserine exposure, membrane permeability, and DNA fragmentation of hemocytes. Unlike in vertebrates, gonyautoxin-5 (GTX5), which...
Tipo: Text
Palavras-chave: Shellfish; Toxin; Harmful algae; Phytoplankton.
Ano: 2017
URL: http://archimer.ifremer.fr/doc/00391/50272/50905.pdf

UPLC-MSE Profiling of Phytoplankton Metabolites: Application to the Identification of Pigments and Structural Analysis of Metabolites in Porphyridium purpureum
Provedor de dados: 5
Autores: Juin, Camille; Bonnet, Antoine; Nicolau, Elodie; Berard, Jean-baptiste; Devillers, Romain; Thiery, Valerie; Cadoret, Jean-paul; Picot, Laurent.
A fast and high-resolution UPLC-MSE analysis was used to identify phytoplankton pigments in an ethanol extract of Porphyridium purpureum (Pp) devoid of phycobiliproteins. In a first step, 22 standard pigments were analyzed by UPLC-MSE to build a database including retention time and accurate masses of parent and fragment ions. Using this database, seven pigments or derivatives previously reported in Pp were unequivocally identified: beta,beta-carotene, chlorophyll a, zeaxanthin, chlorophyllide a, pheophorbide a, pheophytin a, and cryptoxanthin. Minor amounts of Divinyl chlorophyll a, a chemotaxonomic pigment marker for prochlorophytes, were also unequivocally identified using the database. Additional analysis of ionization and fragmentation patterns...
Tipo: Text
Palavras-chave: Carotenoid; Chlorophyll; Dereplication; Divinyl chlorophyll a; Galactosyldiacylglycerol; Gracilamide; Mass spectrometry; MSE; Phytoplankton; Pigment; Porphyridium purpureum; UPLC.
Ano: 2015
URL: http://archimer.ifremer.fr/doc/00269/37994/36069.pdf

Southampton water and the Solent: Biological effects of the multi-use of an estuarine system.
Provedor de dados: 5
Autores: Lockwood, A.
An outline is provided of (1) some factors which have influenced the clam and oyster populations of the area (2) the effect of nutrient load on phytoplankton production (3) the correlation between Mesodinium blooms and the summer oxygen levels in the stratified part of the estuary and (4) a description of the fauna and flora in regions adjacent to some industrial inputs.
Tipo: Text
Palavras-chave: Aquatic communities; Ecosystems; Coastal zone management; Oyster fisheries; Oxygen depletion; Algal blooms; Phytoplankton; Estuaries; Environmental impact.
Ano: 1985
URL: http://archimer.ifremer.fr/doc/1985/acte-1310.pdf

In situ structuring of virioplankton through bacterial exoenzymatic activity: interaction with phytoplankton
Provedor de dados: 5
Autores: Ory, Pascaline; Palesse, S.; Delmas, Daniel; Montanie, Helene.
The abundance and composition of microbial communities were investigated during 2007 in Marennes Oleron Bay (France) in order to characterize the biological relationships governing the planktonic food web. Compared to the results of previous years, there was a lower abundance and a lower magnitude of variations in autotrophic and heterotrophic microbial entities in 2007. Using a Spearman rank correlation analysis, a significant link for biological abundance was only noted between bacteria and ciliates. However, an interesting relationship was highlighted between chlorophyll a and bacterial aminopeptidase and beta-glucosidase exoenzymatic activities. Two characteristic periods of virus-bacteria uncoupling were observed in spring and autumn 2007. Using...
Tipo: Text
Palavras-chave: Virus; Bacteria; Phytoplankton; Diversity; Aminopeptidase.
Ano: 2011
URL: http://archimer.ifremer.fr/doc/00050/16099/13571.pdf

Scaling of coastal phytoplankton features by optical remote sensors: comparison with a regional ecosystem model
Provedor de dados: 5
Autores: Druon, Jean-noel; Loyer, S; Gohin, Francis.
Different scales of hydrological and biological patterns of the Bay of Biscay are assessed using space-borne and airborne optical remote sensing data, field measurements and a 3-dimensional biophysical model. If field measurements provide accurate values on the vertical dimension, ocean colour data offer frequent observations of surface biological patterns at various scales of major importance for the validation of ecosystem modelling. Although the hydrobiological model of the continental margin reproduces the main seasonal variability of surface biomass, the optical remote sensing data have helped to identify low grid resolution, input inaccuracies and neglect of swell-induced erosion mechanism as model limitations in shallow waters. Airborne remote...
Tipo: Text
Palavras-chave: Bay of Biscay; Models; Scaling; Remote sensing; Satellite observation; Phytoplankton.
Ano: 2005
URL: http://archimer.ifremer.fr/doc/2005/publication-953.pdf

Dynamics of phytoplankton productivity and exopolysaccharides (EPS and TEP) pools in the Seine Estuary (France, Normandy) over tidal cycles and over two contrasting seasons
Provedor de dados: 5
Autores: Morelle, Jerome; Schapira, Mathilde; Claquin, Pascal.
Exopolysaccharides (EPS) play an important role in the carbon flux and may be directly linked to phytoplankton and microphytobenthos production, most notably in estuarine systems. However the temporal and spatial dynamics of estuarine EPS are still not well understood, nor how primary productivity triggers this variability at these different scales. The aim of this study was to investigate the primary productivity of phytoplankton and EPS dynamics in the Seine estuary over a tidal cycle in three different haline zones over two contrasted seasons. The other objectives was to investigate the origin of pools of soluble carbohydrates (S-EPS) and transparent exopolymeric particles (TEP) in phytoplankton, microphytobenthos or other compartments. High frequency...
Tipo: Text
Palavras-chave: Phytoplankton; Microphytobenthos; PAM fluorometer; Electron transport rate.
Ano: 2017
URL: http://archimer.ifremer.fr/doc/00400/51132/51898.pdf

A non-linear software sensor to monitor the internal nitrogen quota of phytoplanktonic cells
Provedor de dados: 5
Autores: Bernard, O; Sciandra, A; Sallet, G.
New techniques - called software sensors - issued from the non-linear automatic control field and initially developed for non-linear chemical systems have been applied to a continuous culture of phytoplankton. A software sensor (or 'observer') combines an analytical differential equation based model and partial measurements of the system in order to estimate the non-measured state variables. It filters data and estimates the actual state of living systems, models of which are often rough approximations. The efficiency of this approach is illustrated with a nitrate-limited chemostat experiment with the chlorophyceae Dunaliella tertiolecta performed in a computer controlled fluctuating environment. (C) 2001 Ifremer/CNRS/IRD/Editions scientifiques et...
Tipo: Text
Palavras-chave: Modèle de Droop; Systèmes non linéaires; Observateurs; Phytoplancton; Droop model; Non-linear systems; Observers; Phytoplankton.
Ano: 2001
URL: http://archimer.ifremer.fr/doc/00322/43340/42888.pdf

First steps of ecological restoration in Mediterranean lagoons: Shifts in phytoplankton communities
Provedor de dados: 5
Autores: Leruste, A.; Malet, Nathalie; Munaron, Dominique; Derolez, Valerie; Hatey, E.; Collos, Y.; De Wit, R.; Bec, B.
Along the French Mediterranean coast, a complex of eight lagoons underwent intensive eutrophication over four decades, mainly related to nutrient over-enrichment from continuous sewage discharges. The lagoon complex displayed a wide trophic gradient from mesotrophy to hypertrophy and primary production was dominated by phytoplankton communities. In 2005, the implementation of an 11 km offshore outfall system diverted the treated sewage effluents leading to a drastic reduction of anthropogenic inputs of nitrogen and phosphorus into the lagoons. Time series data have been examined from 2000 to 2013 for physical, chemical and biological (phytoplankton) variables of the water column during the summer period. Since 2006, total nitrogen and phosphorus...
Tipo: Text
Palavras-chave: Phytoplankton; Coastal lagoons; Nutrient; Sewage effluents; Re-oligotrophication.
Ano: 2016
URL: https://archimer.ifremer.fr/doc/00346/45701/45324.pdf

Effect of seafloor depth on phytoplankton blooms in high-nitrate, low-chlorophyll (HNLC) regions
Provedor de dados: 5
Autores: Tyrrell, T.; Merico, A.; Waniek, J. J.; Wong, C. S.; Metzl, N.; Whitney, F.
We calculated correlations between seafloor depth and phytoplankton blooms in all three main high-nitrate, low-chlorophyll (HNLC) regions, but with a particular focus on the subarctic North Pacific area. It has long been known that the central parts of the east and west subarctic North Pacific are HNLC regions. The deep western basin of the Bering Sea is also HNLC, whereas the wide continental shelf of the eastern Bering Sea is not. We carried out a statistical comparison of spatial maps of (1) seafloor depth and (2) chlorophyll a concentration from satellite data. This comparison reveals that shallow waters have, on average, higher peak chlorophyll a concentrations (more intense phytoplankton blooms) than deep waters (p &lt;&lt; 0.01). Possible artifacts...
Tipo: Text
Palavras-chave: Phytoplankton; Ocean color; Bathymetry; HNLC; North Pacific; Iron.
Ano: 2005
URL: https://archimer.ifremer.fr/doc/00232/34337/32758.pdf

La qualité du milieu marin littoral normand du Tréport au Mont - Saint - Michel
Provedor de dados: 5
Autores: Grouhel-pellouin, Anne; Etourneau, Claude; Lamort, Laure.
This report presents an evaluation of Normandy's coastal quality. Datas for this evaluation come from chemical, microbial and phytoplanktonic monitoring networks carried out by IFREMER in the marine environment, microbial survey of marine swimming and shellfish collecting areas carried out by DDASS (Health Office), analysis of local sewage treatment systems conduced by SATESE, and surveys of river's water quality carried out by DDE (Equipment Office). Among each area, pollution sources are identified and present or future actions to improve marine water quality are listed according to shellfishing or swimming vocation of these areas.
Tipo: Text
Palavras-chave: Normandie; Qualité; Littoral; Réseaux de surveillance; Physico-chimie; Microbiologie; Phytoplancton; Radioactivité; Normandy; Quality; Coastal Area; Monitoring Network; Chemical; Microbiology; Phytoplankton; Radioactivity.
Ano: 1996
URL: http://archimer.ifremer.fr/doc/00102/21347/18970.pdf

La conchyliculture française - 1° Partie : Le milieu naturel et ses variations
Provedor de dados: 5
Autores: Marteil, Louis.
Table of Contents  The Natural Environment      Production centres           Oyster farming centres           Mussel farming centres  Chapter I. - The Physicochemical Environment      I. Sea Water           a) Transparency, turbidity            b) Temperature           c) Salinity           d) Dissolved gases           e) Substances dissolved in the water           f) Water movements           g) Hydrology of the main shellfish farming centres      II. Soils           a) Soil properties           b) Mechanical amendment of soils, its effects           c) Fertilisation of soils in shellfish farming           d) Changes in soils due to farming      Bibliography  Chapter II. - The Natural Environment      Phytoplankton      Zooplankton           Basic biology...
Tipo: Text
Palavras-chave: Zooplankton; Phytoplankton; Water pollution; Sea water; Natural environment; Shellfish culture.
Ano: 1974
URL: http://archimer.ifremer.fr/doc/1974/publication-1776.pdf

An Ocean-Colour Time Series for Use in Climate Studies: The Experience of the Ocean-Colour Climate Change Initiative (OC-CCI)
Provedor de dados: 5
Autores: Sathyendranath, Shubha; Brewin, Robert; Brockmann, Carsten; Brotas, Vanda; Calton, Ben; Chuprin, Andrei; Cipollini, Paolo; Couto, André; Dingle, James; Doerffer, Roland; Donlon, Craig; Dowell, Mark; Farman, Alex; Grant, Mike; Groom, Steve; Horseman, Andrew; Jackson, Thomas; Krasemann, Hajo; Lavender, Samantha; Martinez-vicente, Victor; Mazeran, Constant; Mélin, Frédéric; Moore, Timothy; Müller, Dagmar; Regner, Peter; Roy, Shovonlal; Steele, Chris; Steinmetz, François; Swinton, John; Taberner, Malcolm; Thompson, Adam; Valente, André; Zühlke, Marco; Brando, Vittorio; Feng, Hui; Feldman, Gene; Franz, Bryan; Frouin, Robert; Gould, Richard; Hooker, Stanford; Kahru, Mati; Kratzer, Susanne; Mitchell, B.; Muller-karger, Frank; Sosik, Heidi; Voss, Kenneth; Werdell, Jeremy; Platt, Trevor.
Ocean colour is recognised as an Essential Climate Variable (ECV) by the Global Climate Observing System (GCOS); and spectrally-resolved water-leaving radiances (or remote-sensing reflectances) in the visible domain, and chlorophyll-a concentration are identified as required ECV products. Time series of the products at the global scale and at high spatial resolution, derived from ocean-colour data, are key to studying the dynamics of phytoplankton at seasonal and inter-annual scales; their role in marine biogeochemistry; the global carbon cycle; the modulation of how phytoplankton distribute solar-induced heat in the upper layers of the ocean; and the response of the marine ecosystem to climate variability and change. However, generating a long time series...
Tipo: Text
Palavras-chave: Ocean colour; Water-leaving radiance; Remote-sensing reflectance; Phytoplankton; Chlorophyll-a; Inherent optical properties; Climate Change Initiative; Optical water classes; Essential Climate Variable; Uncertainty characterisation.
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00589/70072/68045.pdf

Phytoplankton spring bloom of the Gironde plume waters in the Bay of Biscay: early phosphorus limitation and food-web consequences
Provedor de dados: 5
Autores: Herbland, Alain; Delmas, Daniel; Laborde, P; Sautour, B; Artigas, F.
During the spring 1995 (2-25 May), a cruise was carried on the RV Poseidon (Germany) on the continental shelf of the south Bay of Biscay. The objective was a comprehensive study of the planktonic food web within the Gironde plume waters. In these waters phosphate was present at very low concentrations (undetectable to &lt; 0.1 mu mol.L-1), whereas nitrate, silicate and ammonium concentrations were much higher (several mu mol.L-1 for nitrate and silicate and 0.5 to 1.0 mu mol.L-1 for ammonium). The size distribution of the phytoplankton biomass (estimated from chlorophyll a measurements by high performance liquid chromatography) and primary production (measured by C-14 in situ method) showed a great proportion of small (40 to 70 % &lt; 3 mu m) and active...
Tipo: Text
Palavras-chave: Phosphate; Phytoplancton; Facteur limitant; Estuaire; Eau côtière; Phosphate; Phytoplankton; Limiting factor; Estuarine water; Coastal water.
Ano: 1998
URL: http://archimer.ifremer.fr/doc/1998/publication-850.pdf

The evolution of light and vertical mixing across a phytoplankton ice-edge bloom
Provedor de dados: 5
Autores: Randelhoff, Achim; Ozierm, Laurent; Massicotte, Philippe; Becu, Guislain; Gali, Marti; Lacour, Leo; Dumont, Dany; Vladoiu, Anda; Marec, Claudie; Bruyant, Flavienne; Houssais, Marie-noelle; Tremblay, Jean-eric; Deslongchamps, Gabriele; Babin, Marcel.
During summer, phytoplankton can bloom in the Arctic Ocean, both in open water and under ice, often strongly linked to the retreating ice edge. There, the surface ocean responds to steep lateral gradients in ice melt, mixing, and light input, shaping the Arctic ecosystem in unique ways not found in other regions of the world ocean. In 2016, we sampled a high-resolution grid of 135 hydrographic stations in Baffin Bay as part of the Green Edge project to study the ice-edge bloom, including turbulent vertical mixing, the under-ice light field, concentrations of inorganic nutrients, and phytoplankton biomass. We found pronounced differences between an Atlantic sector dominated by the warm West Greenland Current and an Arctic sector with surface waters...
Tipo: Text
Palavras-chave: Arctic; Phytoplankton; Ice edge; Spring bloom; Light; Turbulence.
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00504/61530/65391.pdf

Seasonal variability in microplanktonic biomasses in the Gironde dilution plume (Bay of Biscay): relative importance of bacteria
Provedor de dados: 5
Autores: Artigas, Lf.
Bacterial and phytoplankton biomasses were estimated in a four-year study along a saline gradient (the dilution plume of the Gironde estuary on the Aquitanian continental shelf), by measuring bacterial abundance and mean cell volumes (epifluorescence counts) and chlorophyll-a concentrations tin vitro fluorescence). The spatial and temporal distribution of phytoplankton enabled us to determine the seasonal succession of algal blooms, sprouting in the marine waters of the inner shelf in early spring (picoplanktonic forms), reaching their annual maximum (10 mu g L-1) in plume waters in advanced spring, and moving to estuarine waters in the summer (&gt; 20 mu m forms). Bacterial biomasses followed mainly a decreasing dilution gradient, especially in winter and...
Tipo: Text
Palavras-chave: Bactéries; Phytoplancton; Rapport des biomasses microbiennes; Variabilité saisonnière; Panache de dilution girondin; Bacterioplankton; Phytoplankton; Microbial biomass ratio; Seasonal variability; Gironde dilution plume.
Ano: 1998
URL: http://archimer.ifremer.fr/doc/00325/43659/43210.pdf

Preliminary estimate of primary production by phytoplankton in Marennes-Oléron Bay, France
Provedor de dados: 5
Autores: Struski, Caroline; Bacher, Cedric.
The macrotidal bay of Marennes-Oléron is the most important French site for shellfish production (oysters and mussels); yet the primary productivity of the phytoplankton compartment in this system is not well known. In this study, photosynthetic parameters were determined using 14C incubations of bottom and surface water samples, during fall, winter and summer (2001¿2002), along a north¿south transect in the bay. Estimates of primary productivity showed that water column primary production is light-limited in the bay and that a BZpI0 type model can be applied. Spatial differences existed in the bay, with a more productive northern zone and less productive river area. With a water column primary production of 185 g C m&amp;#8722;2 yr&amp;#8722;1,...
Tipo: Text
Palavras-chave: BZpI0 model; Tidal bay; Light limitation; Turbidity; Phytoplankton; Photosynthesis parameters.
Ano: 2006
URL: http://archimer.ifremer.fr/doc/2006/publication-572.pdf

Contribution a l'etude du microplancton des etangs corses de Diana et Urbino et du secteur marin adjacent.
Provedor de dados: 5
Autores: Paulmier, Gerard.
Investigations carried out in both Corsica lagoons Diana and Urbino during the period from January to August 1985, permitted to define the main characteristics of microplankton cycle. Two phytoplanktonic blooms have been observed, first in winter, second less important in July-August. Any correlation cannot be observed between phytoplanktonic cycle or one its main components, and both environmental variables temperature and salinity. However dissolved oxygen ratio may be subject to large summer variations, drifting towards until ecological desequilibrious.
Tipo: Text
Palavras-chave: Algal blooms; Dissolved oxygen; Salinity effects; Temperature effects; Phytoplankton; Plankton.
Ano: 1984
URL: http://archimer.ifremer.fr/doc/1984/publication-1800.pdf

Sedimentation pathways in the Indian sector of the Southern Ocean during a production regime dominated by regeneration
Provedor de dados: 5
Autores: Cailliau, C; Belviso, S; Goutx, M; Bedo, A; Park, Y; Charriaud, E.
During summer 1994, the production regime at 2 sites located in the Indian sector of the Southern Ocean, one in the Permanent Open Ocean Zone (POOZ) at 52 degrees S, and a second in the Seasonal Ice Zone (SIZ) at 63 degrees S, was dominated by regeneration (0.3 &lt; f-ratio &lt; 0.4). Two time series, each of about 4 d, were performed over pre-determined time intervals of 4 h using a free-floating sediment trap set at 200 m at the 2 sites. Hourly variations of C, N, chlorophyll a (chl a) and its degradation products, taxon-specific pigments, lipid classes and dimethylsulfoniopropionate (DMSP) were measured simultaneously. Measurements in the water column were done during the sediment trap drifting. Fucoxanthin, a typical diatom pigment, was the major...
Tipo: Text
Palavras-chave: Antarctic; Austral ocean; Sediment traps; Diel cycles; Phytoplankton; Pigments; Lipids; DMSP; DMS.
Ano: 1999
URL: https://archimer.ifremer.fr/doc/00240/35083/33651.pdf

Evaluation of the partial renewal of in situ phytoplankton microcosms and application to the impact assessment of bentazon and dimethenamid
Provedor de dados: 5
Autores: De La Broise, Denis; Stachowski-haberkorn, Sabine.
Microcosms, each consisting of 2 L natural surface seawater maintained in 2.3-L glass bottles, were immersed at a depth of 6 metres. The renewal of ten percent of microcosm volumes was carried out every other day. Phytoplankton-containing seawater was used for renewal (previously filtered through 25-, 50- or 200-μm cut-off). Phytoplankton community pigment analysis (by HPLC) and flow cytometry analysis were performed. After 13 days, data exhibited phytoplankton characteristics in microcosms in the same range as that of the natural surrounding sea water over the same period. Furthermore, in these microcosms, a negative correlation was observed between the filtration cut-off used for renewal water, and the eukaryote cell count. Herbicides were tested as...
Tipo: Text
Palavras-chave: Phytoplankton; Microcosm; Herbicides; Dimethenamid; Bentazon.
Ano: 2012
URL: http://archimer.ifremer.fr/doc/00088/19889/17548.pdf

Dynamics of an estuarine ecosystem: The influence of flow patterns on phytoplankton trends in the Chesapeake Bay
Provedor de dados: 5
Autores: Marshall, Hg; Alden, Rw.
Long term trends in the phytoplankton of the lower Chesapeake Bay were identified using flow corrected and uncorrected data sets, with 22 of 23 significant trends similar under both conditions. The major trends between 1985-1992 were for: 1) reduced phytoplankton concentrations; 2) decreasing numbers of phytoplankton taxa during spring, summer and fall months; and 3) seasonally mixed trends for diatom abundance in waters below the pycnocline, with spring months having decreasing densities, and increasing abundance trends in November and December. The flow patterns had different effects on the trends. Flow diminished the magnitude of the trends for total phytplankton concentrations, so these trends were greater in the flow corrected data. There were mixed...
Tipo: Text
Palavras-chave: Phytoplankton; Chesapeake Bay; Trends; Flow.
Ano: 1997
URL: http://archimer.ifremer.fr/doc/00093/20383/18051.pdf

Three Dinophyceae from Clipperton Island lagoon (eastern Pacific Ocean), including a description of Peridiniopsis cristata var. tubulifera var. nov.
Provedor de dados: 5
Autores: Coute, Alain; Perrette, Catherine; Chomerat, Nicolas.
Clipperton Island is a small French coral atoll in the eastern Pacific Ocean, which has been rarely investigated because of its remote location and difficult access. There is little scientific information on this ecosystem and only a few microalgae have been reported from the lagoon. To date, only one dinoflagellate taxon, Peridiniopsis cristata, is known to inhabit the lagoon. During an expedition in 2005 to study the lagoon and the surrounding oceanic waters of Clipperton Island, a further investigation of the lagoon phytoplankton was undertaken. In addition to P. cristata, which was still abundant in the upper water layer, two other thecate dinoflagellates were recorded. One dinoflagellate was identified as Durinskia baltica, while the other had the...
Tipo: Text
Palavras-chave: Dinoflagellates; Lagoon; Morphology; Phytoplankton; Taxonomy.
Ano: 2012
URL: http://archimer.ifremer.fr/doc/00070/18086/15633.pdf

Hydrologie et distribution de dinophysis en juin 1988, dans la frange côtière nord-Gascogne
Provedor de dados: 5
Autores: Lassus, Patrick; Truquet, Philippe; Le Dean, Loic; Bardouil, Michele.
During the oceanographic cruise of June 1988, phytoplankton and correlated hydrological parameters were studied in the coastal area between Camaret and Ile d'Oléron. 62 stations were sampled in the 0-30 m layer within the 50 m depth limited coastal area. Observations focused on two toxic dinoflagellate species: Dinophysis spp and Gyrodinium aureolum. Dinophysis spp is more abundant in the Loire/Vilaine area, which is.characterized by high surface Nitrate levels, high 30 m depth Phosphate levels and Chlorophyll a amounts higher than elsewhere during the survey. This particuliar pattern can be related to the Nutrient outputs of Loire and Vilaine Rivers. Max. Dinophysis concentrations were observed in Vilaine bay (very high Phosphate levels) and in Douarnenez...
Tipo: Text
Palavras-chave: Phytoplancton; Dinophysis; Gyrodinium aureolum; Hydrologie; Sels nutritifs; Campagne côtière; Nord Gascogne; Phytoplankton; Dinophysis; Gyrodinium aureolum; Hydrology; Nutrients; Coastal cruise; Northern Biscay.
Ano: 1989
URL: http://archimer.ifremer.fr/doc/00432/54323/58896.pdf

Optimisation de l’identification et du dénombrement du microphytoplancton avec le système couplé de numérisation et d’analyse d’images FlowCAM – Zoo/PhytoImage (système innovant)
Provedor de dados: 5
Autores: Grosjean, Philippe; Wacquet, Guillaume.
This report details the work accomplished to enhance the Zoo/PhytoImage software to optimize its use for the analysis of phytoplankton samples in general, but more particularly, in the framework of an operational survey of coastal seawater (REPHY, IFREMER). Zoo/PhytoImage allows to analyze “numerically recorded” plankton samples, that is, by using digital images gathered with specialized devices such as the FlowCAM, or the FastCAM (see report 3). A machine learning approach allows to automatically classify the digitized particles into various taxonomic groups. Once this is done, global statistics are calculated on each sample, including the number of particles, the biomass, and the size spectrum per taxonomic group. Two major changes are introduced in the...
Tipo: Text
Palavras-chave: Phytoplancton; REPHY; Analyse d'image; Classification supervisée; Dénombrement de cellules; Apprentissage actif; Manche; Atlantique.; Phytoplankton; REPHY; Image analysis; Machine learning; Cells enumeration; Active learning; The Channel; Atlantic Ocean.
Ano: 2016
URL: http://archimer.ifremer.fr/doc/00389/49990/50578.pdf

Feeding and energetics of the great scallop, Pecten maximus, through a DEB model
Provedor de dados: 5
Autores: Lavaud, Romain; Flye-sainte-marie, Jonathan; Jean, Fred; Emmery, Antoine; Strand, Oivind; Kooijman, Sebastiaan A. L. M.
We developed a full life-cycle bioenergetic model for the great scallop P. maximusrelying on the concepts of the Dynamic Energy Budget (DEB) theory. The covariation method was implemented to estimate the parameters of a standard DEB model. Such models are able to predict various metabolic processes from a food availability marker and temperature in the environment. However, suspension-feeders are likely to feed on various trophic sources, from microalgae cells to detritus. They are also able to sort and select food particles very efficiently, depending on their size, energetic value or quality. The present model includes a mechanistic description of the feeding processes, based on Kooijman’s Synthesizing Unit principle which allow to deal with several food...
Tipo: Text
Palavras-chave: Pecten maximus; DEB theory; Synthesizing Units; Phytoplankton; Feeding process; Bay of Brest.
Ano: 2014
URL: http://archimer.ifremer.fr/doc/00162/27316/28458.pdf

Zeaxanthin from Porphyridium purpureum induces apoptosis in human melanoma cells expressing the oncogenic BRAF V600E mutation and sensitizes them to the BRAF inhibitor vemurafenib
Provedor de dados: 5
Autores: Juin, Camille; De Oliveira Junior, Raimundo Gonsalves; Fleury, Audrey; Oudinet, Chloe; Pytowski, Lior; Berard, Jean-baptiste; Nicolau, Elodie; Thiery, Valerie; Lanneluc, Isabelle; Beaugeard, Laureen; Prunier, Gregoire; Guedes Da Silva Almeida, Jackson Roberto; Picot, Laurent.
Zeaxanthin, an abundant carotenoid present in fruits, vegetables and algae was reported to exert antiproliferative activity and induce apoptosis in human uveal melanoma cells. It also inhibited uveal melanoma tumor growth and cell migration in nude mice xenograft models. Here we report that zeaxanthin purified from the rhodophyte Porphyridium purpureum (Bory) K.M.Drew &amp; R.Ross, Porphyridiaceae, promotes apoptosis in the A2058 human melanoma cell line expressing the oncogenic BRAF V600E mutation. Zeaxanthin 40 μM (IC50) induced chromatin condensation, nuclear blebbing, hypodiploidy, accumulation of cells in sub-G1 phase, DNA internucleosomal fragmentation and activation of caspase-3. Western blot analysis revealed that zeaxanthin induced up-regulation...
Tipo: Text
Palavras-chave: Cancer; Carotenoid; Melanoma; Microalgae; Phytoplankton; Zeaxanthin.
Ano: 2018
URL: http://archimer.ifremer.fr/doc/00444/55595/57227.pdf

Essai d'aptitude par comparaison Inter-analystes pour l'évaluation des performances en identification et dénombrement du phytoplancton marin. Rapport d'évaluation des analystes du phytoplancton dans le cadre du réseau d'observation et de surveillance du phytoplancton et de l'hydrologie (REPHY) mis en œuvre par l'Ifremer. Exercice 2018
Provedor de dados: 5
Autores: Neaud-masson, Nadine; Brun, Melanie.
The determination of phytoplankton species and the estimation of their abundance in the context of the Phytoplankton and Hydrology Monitoring and Surveillance Network, implemented by Ifremer (REPHY), are based in 2018 on 25 analysts spread over 12 sites. Proficiency testing by inter-laboratory or inter-analyst comparison is used to evaluate the performance of laboratories or analysts on specific skills. An International Phytoplankton Inter-comparison (IPI) is organized annually by the Marine Institute Phytoplankton unit of Galway (Ireland), to evaluate marine phytoplankton identification and enumeration performance. The IPI is implementing its inter-comparison exercises through the Marine Institute Ireland in cooperation with the Intergovernmental...
Tipo: Text
Palavras-chave: Phytoplancton; Comparaison Inter-Laboratoire; CIL; Comparaison Inter-Analyste; CIA; Essai d’aptitude; Phytoplankton; Inter-Laboratory Comparison; ILC; Inter-Analyst Comparison; IAC; Aptitude Test; International Phytoplankton Inter-comparison; IPI.
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00592/70415/68505.pdf

Variabilidad fitoplanctónica en 5 bahías, Islas Galápagos (Ecuador)
Provedor de dados: 20
Autores: Tapia, M.E.; Torres, G.
El aporte de esta investigación, será dar una evaluación sobre la distribución cuali-cuantitativamente del fitoplancton y paralelamente iniciar una base de datos en 5 bahías de las Islas Galpagos.
Tipo: Journal Contribution
Palavras-chave: Variability; Phytoplankton; Chlorophylls; Biomass; Geographical distribution; Species diversity; Phytoplankton; Biomass; Geographical distribution; Chlorophylls; Species diversity; Http://aims.fao.org/aos/agrovoc/c_13344; Http://aims.fao.org/aos/agrovoc/c_926; Http://aims.fao.org/aos/agrovoc/c_5083; Http://aims.fao.org/aos/agrovoc/c_1577; Http://aims.fao.org/aos/agrovoc/c_33954.
Ano: 2000
URL: http://hdl.handle.net/1834/2239

Impacto de las floraciones algales nocivas en Uruguay: origen, dispersión, monitoreo, control y mitigación
Provedor de dados: 20
Autores: Méndez, S.M.
Las floraciones algales nocivas (FANs) afectan la salud humana, la economía pesquera, el turismo y los ecosistemas acuáticos. Dado que el problema de las FANs es mundial, para minimizar sus efectos se han implementado programas de monitoreo en más de 50 países. El registro de especies de fitoplancton tóxico ha ido creciendo y cada vez se conoce más diversidad de toxinas producidas por estos microorganismos. En Uruguay, la Dirección Nacional de Recursos Acuáticos (DINARA) dependiente del Ministerio de Ganadería Agricultura y Pesca (MGAP) lleva a cabo el monitoreo simultáneo de las FANs y la toxicidad en los moluscos. Esta modalidad de monitoreo y la confirmación de la toxicidad de algunas especies de microalgas, permite establecer la relación de causalidad...
Tipo: Book Section
Palavras-chave: M40; Phytoplankton; Algal blooms; Environmental monitoring; Plant control; Phytoplankton; Environmental monitoring; Algal blooms; Http://aims.fao.org/aos/agrovoc/c_13344; Http://aims.fao.org/aos/agrovoc/c_37876; Http://aims.fao.org/aos/agrovoc/c_32367.
Ano: 2006
URL: http://hdl.handle.net/1834/3245

Composición y distribución del fitoplancton durante la prospección sísmica en la costa ecuatoriana, diciembre de 2008
Provedor de dados: 20
Autores: Tapia, M.E.
This work includes the composition and distribution of phytoplankton in the coastal region. For this purpose were established 23 stations on three regions and six sections divided from the northern region of Esmeraldas to the south of Puerto Bolívar, this work was carried out at the Research Vessel Orión in december 2008. The greater diversity of the phytoplankton community in the surface layer was observed in the Central Region, Specifically in section 4 with a total of 84 species, highlighting the dominant species of diatoms as Rhizosolenia stolterfothii, Thalasssiosira subtilis, R. imbricata, Proboscia alata, Chaetoceros affinis, and in the group there were abundant dinoflagellates Gonyaulax poledra and Goniodoma polyedricum, characteristics of the...
Tipo: Journal Contribution
Palavras-chave: Composition; Distribution; Phytoplankton; Biological production; Species diversity.
Ano: 2013
URL: http://hdl.handle.net/1834/5752

Impact des perturbations anthropiques sur l'évolution du phytoplancton de la lagune de Boughrara, ( tunisie )
Provedor de dados: 20
Autores: Romdhane, M.S.; Ben Rejeb-Jenhani, A.
La détérioration de la qualité des eaux de la lagune de Boughrara, conséquence de divers apports polluants et d’échanges d’eaux limités avec la mer, s’est traduite  par un accroissement sévère de l’eutrophisation du milieu se manifestant notamment par d’importantes proliférations microalgales. L’analyse de l’évolution de l’ensemble des groupes phytoplanctoniques a montré que les périodes de forte biomasse algale sont caractérisées par des développements  monospécifiques. L’importance relative croissante de la classe des dinoflagellés se manifestent par un net accroissement du rapport dinoflagellés / diatomées. Le très fort développement  de l’espèce  Gymnodinium cf nagasakiense , (densités maximales de l’ordre de 6.10 6 cellules par litre ) espèce connue...
Tipo: Journal Contribution
Palavras-chave: Diatoms; Environmental factors; Lagoons; Phytoplankton; Geographical distribution.
Ano: 2002
URL: http://hdl.handle.net/1834/236

Biogeografía y análisis retrospectivo de Alexandrium catenella (Dinoflagellata) en la zona austral de Chile
Provedor de dados: 20
Autores: Villanueva Sanhueza, F.A.
Actualmente la intensidad, duración y cobertura geográfica de las FAN producidas por la especie Alexandrium catenella (Whedon &amp; Kofoid, Balech 1985), en el sur de Chile han aumentado desde 1972 hasta 2005, extendiéndose desde la XII Región hasta la X Región. De una estación fija ubicada en la XI Región, denominada “Nueva Hammerfest”, se analizó una serie de tiempo desde 1993 a 2005, con el fin de determinar si la presencia de A. catenella está relacionada con eventos tóxicos de esta especie observados en la zona austral de Chile. El análisis se basó en el recuento de células de muestras de red, estimación de Índices de Abundancia Relativa y relaciones de dependencia de la especie con registros de temperatura del agua. Se recolectaron 537 muestras de...
Tipo: Theses and Dissertations
Palavras-chave: Biogeography; Phytoplankton; Red tides.
Ano: 2005
URL: http://hdl.handle.net/1834/4917

Cocolitofóridos identificados en el fitoplancton de aguas ecuatorianas
Provedor de dados: 20
Autores: Jiménez, R.
Muestras del fitoplancton de aguas de mar y de red de arrastre fueron recolectadas abordo del B.A.E "ORION" del Instituto Oceanográfico de la Armada, durante el período de 1972 -1979. La mayor parte de las especies fueron identificadas mediante el microscopio estandar de Zeiss con optovar incorporado, y el microscopio invertido utilizado para los contajes celulares. La identificación de las células más pequeñas fue confirmada con el Microscopio Electrónico de Barrido. 37 especies de cocolitofóridos fueron reconocidos y serán incorporados en los conteos celulares de las investigaciones futuras. Estos organismos constituyeron una población muy importante del fitoplancton marino de aguas ecuatorianas, y contribuyeron en muchas ocasiones, hasta con el 90% de...
Tipo: Journal Contribution
Palavras-chave: Phytoplankton; Cells; Phytoplankton; Cells; Http://aims.fao.org/aos/agrovoc/c_13344; Http://aims.fao.org/aos/agrovoc/c_1418.
Ano: 1983
URL: http://hdl.handle.net/1834/2099

Estudios ecológicos en el Golfo San Jorge y adyacencias (Atlántico sudoccidental). Distribución, abundancia y variación estacional del fitoplancton en relación a factores físico-químicos y la dinámica hidrológica.
Provedor de dados: 20
Autores: Akselman, R.
This study was based on four seasonal cruises during 1984 and 1985.  It revealed a thermo-haline frontal system formed by the advection of the Coastal Water mass flowing in two branches, one running towards the coast and the other mid-shelf directed. The thermocline developed between late spring and autumn results in a low inorganic nutrient concentration in the upper layer. Nonetheless in winter, a vertical homogeneity and high nutrient concentration were observed.  Phytoplankton development presented a typical temperate-seas annual cycle. In winter, reduced populations were dominated by diatoms. The highest biomass concentration in the cycle coincided with the spring blooming, to which Thalassio sira anguste-lineata,Alexandrium tamarense, Heterocapsa...
Tipo: Theses and Dissertations
Palavras-chave: Phytoplankton; Abundance; Trophic relationships; Cysts; Seasonal variations; Seasonal thermocline; Plankton surveys; Environmental effects; Phytoplankton; Cysts; Http://aims.fao.org/aos/agrovoc/c_13344; Http://aims.fao.org/aos/agrovoc/c_34811.
Ano: 1996
URL: http://hdl.handle.net/1834/1464

Condiciones del plancton en una estación fija: Puerto El Morro-Playas, Golfo de Guayaquil, 2000-2002
Provedor de dados: 20
Autores: Bonilla Coello, M.A.; Plúas, F.; Camposano, J.
En este estudio se examina la abundancia estructura poblacional y variación temporal del plancton, especialmente de copépodos en el Golfo de Guayaquil, a través de tres años de estudio, en condición no El Niño.
Tipo: Journal Contribution
Palavras-chave: Plankton; Phytoplankton; Abundance; Distribution; Zooplankton; Marine crustaceans; Fixed stations; Population structure; Diatoms; Fish eggs; Fish larvae; Population structure; Plankton; Phytoplankton; Distribution; Zooplankton; Diatoms; Fish larvae; Http://aims.fao.org/aos/agrovoc/c_6115; Http://aims.fao.org/aos/agrovoc/c_5950; Http://aims.fao.org/aos/agrovoc/c_13344; Http://aims.fao.org/aos/agrovoc/c_35773; Http://aims.fao.org/aos/agrovoc/c_15490; Http://aims.fao.org/aos/agrovoc/c_32657; Http://aims.fao.org/aos/agrovoc/c_2924.
Ano: 2002
URL: http://hdl.handle.net/1834/2315

Biophysical isopycnic-coordinate modelling of plankton dynamics in the Arabian Sea
Provedor de dados: 20
Autores: Idrisi, N.; Romanou, A.; Olascoaga, M.J.
A Nutrients-Phytoplankton-Zooplankton-Detritus (NPZD) ecosystem model is coupled to the Miami Isopycnic-Coordinate Ocean Model (MICOM) to study planktondynamics in the Arabian Sea. Experiments oriented to testing the NPZD-MICOM coupled model sensitivity to variations in several parameters are performed. Particular attention is paid to the rates of detritus sinking and maximum phytoplankton growth rate. The coarse features of the blooms are captured by all the experiments considered, and agree with earlier models for the biological activity of the region. Intensity, duration, and peaks of the blooms are found to be quite sensitive to the parameter choices. The existence of an offshore deep chlorophyll maximum in the model is found to be closely related to...
Tipo: Journal Contribution
Palavras-chave: Phytoplankton; Zooplankton; Detritus; Biophysics; Modelling; Arabian Sea; Http://aims.fao.org/aos/agrovoc/c_565.
Ano: 2005
URL: http://hdl.handle.net/1834/271

Distribución del primer  nivel trófico (fitoplancton) en el Pacífico ecuatoriano, período 1996-1997 (pre-El Niño)
Provedor de dados: 20
Autores: Tapia, M.E.; Torres, G.
Este artículo describe las condiciones bio-oceanográficas del primer nivel trófico, distribución y concentración de la biomasa fitoplanctónica (clorofila "a") y contajes celulares) a nivel superficial y subsuperficial de la capa fótica a los 75 m. de profundidad, se da la distribución de especies indicadoras del fitoplancton y su relación con las variables de temperatura y nutrientes, registrados en tres cruceros oceanográficos realizados en octubre/1996, abril-mayo/1997 y agosto/1997.
Tipo: Journal Contribution
Palavras-chave: Distribution; Biomass; Chlorophylls; Phytoplankton; Indicator species; El Nino phenomena; Trophic levels; Multiship expeditions; Distribution; Biomass; Phytoplankton; Trophic levels; Chlorophylls; Indicator species.
Ano: 1998
URL: http://hdl.handle.net/1834/2280

Composición y distribución de la biomasa del plancton en el frente ecuatorial
Provedor de dados: 20
Autores: Jiménez, R.; Bonilla, D.
Este trabajo presenta los resultados de la distribución de la biomasa y composición del fitoplancton y zooplancton en el frente ecuatorial, cuya presencia caracteriza las condiciones consideradas como "normal" para el sistema de circulación oceánica del Pacífico Tropical.
Tipo: Journal Contribution
Palavras-chave: Composition; Distribution; Biomass; Cruises; Phytoplankton; Zooplankton; Distribution; Biomass; Phytoplankton; Zooplankton; Http://aims.fao.org/aos/agrovoc/c_35773; Http://aims.fao.org/aos/agrovoc/c_926; Http://aims.fao.org/aos/agrovoc/c_13344; Http://aims.fao.org/aos/agrovoc/c_15490.
Ano: 1980
URL: http://hdl.handle.net/1834/2090

Diversidad del plancton en el estuario interior de Puerto Bolívar, Ecuador durante julio de 2002
Provedor de dados: 20
Autores: Tapia, M.E.; Naranjo, Ch.
Los objetivos del presente estudio son:- Establecer el estado actual del plancton en el estero Santa Rosa, estero Jambelí y río Jubones durante las fases de flujo y reflujo. - Determinar la productividad, dominación y diversidad del plancton presentes en el área de estudio.
Tipo: Journal Contribution
Palavras-chave: Species diversity; Biological production; Plankton; Phytoplankton; Zooplankton; Biomass; Biological production; Plankton; Phytoplankton; Zooplankton; Biomass; Species diversity; Http://aims.fao.org/aos/agrovoc/c_36649; Http://aims.fao.org/aos/agrovoc/c_5950; Http://aims.fao.org/aos/agrovoc/c_13344; Http://aims.fao.org/aos/agrovoc/c_15490; Http://aims.fao.org/aos/agrovoc/c_926; Http://aims.fao.org/aos/agrovoc/c_33954.
Ano: 2004
URL: http://hdl.handle.net/1834/2293

Phytoplankton community in abu-qir bay as a hot spot on the southeastern mediterranean coast
Provedor de dados: 20
Autores: Shams El-Din, N.G.; Dorgham, M.M.
The phytoplankton community in the stressed part of Abu Qir Bay was studied monthly relative to the prevailing ecological conditions from April 1998 to March 1999 at eight stations. The study recorded a total of 182 species of both fresh and marine origins, belonging to diatoms (89 species), chlorophytes (34 species), dinoflagellates (26 species), cyanophytes (18 species), euglenophytes (12 species), silicoflagellates (2 species), and cryptophyte (one species). Most of the recorded species occurred either seasonally or rarely, while small number of them appeared as persistent. The diversity of the phytoplankton community experienced wide variations on both monthly and spatial scales, accompanied by analogous variations in the diversity index, richness and...
Tipo: Journal Contribution
Palavras-chave: Field Study; Phytoplankton; Phytoplankton; Http://aims.fao.org/aos/agrovoc/c_13344.
Ano: 2007
URL: http://hdl.handle.net/1834/1902

Variabilidad del plancton en estaciones fijas frente a la costa ecuatoriana durante el 2008
Provedor de dados: 20
Autores: Prado, M.; Cajas, J.
Se realizó el análisis de plancton  en tres estaciones fijas ubicadas en el perfil de la costa ecuatoriana: Esmeraldas, Punta Galera y Puerto López entre abril y diciembre de 2008. Las muestras fueron obtenidas mensualmente, identificándose un total de 99 especies fitoplanctónicas y 122 zooplanctónicas. El análisis cualitativo y cuantitativo de la variación mensual del plancton fue comparado entre los años 2006, 2007 y 2008, determinándose que el año 2008 fue el de mayor productividad y que Esmeraldas registró la mayor productividad fitoplanctónica y la menor densidad zooplanctónica; tendencia contraria a Punta Galera y Puerto López, estaciones donde se registraron densidades fitoplanctónicas menores y altas concentraciones de zooplancton debido a la...
Tipo: Journal Contribution
Palavras-chave: Fixed stations; Oceanographic data; Phytoplankton; Zooplankton; Plankton surveys.
Ano: 2009
URL: http://hdl.handle.net/1834/4787

Ecological studies on fish farms of el-fayoum depression (egypt)
Provedor de dados: 20
Autores: Konsowa, A.H.
This study was carried out at the fish farms of El-Fayioum province during 2003 farming season. They extend along the eastern bank of Lake Qarun. These farms derive its water and drainage wastes into Diar El-Berka Drain. pH values at the chosen farms ranged between 7.43 and 8.91 and its values are certainly optimum for fish culture. Salinity levels at fish farms adjacent to Lake Qarun (Goda 2, 9.5‰) are generally much higher than the other fishing ponds due to seepage from the lake water. The major nutrient concentrations (N &amp; P) at the main feeder were much higher than the corresponding values at fish farms. Nitrogen concentrations that represented by NO2-N, NO3-N and NH4-N indicated the dominance of NH4-N over NO2-N and NO3-N at the selected fish...
Tipo: Journal Contribution
Palavras-chave: Field Study; Phytoplankton; Water quality; Fish farms; Phytoplankton; Water quality; Http://aims.fao.org/aos/agrovoc/c_13344; Http://aims.fao.org/aos/agrovoc/c_16061.
Ano: 2007
URL: http://hdl.handle.net/1834/1887

Plancton alrededor de las Islas Galápagos durante el crucero oceanográfico efectuado en mayo de 2004
Provedor de dados: 20
Autores: Tapia, M.E.; Naranjo, Ch.
El presente trabajo comprende la composición y distribución del plancton en las Islas Galápagos. Para el efecto se establecieron 13 estaciones ubicadas en las secciones 92° - 90° y 89° W, realizadas en mayo del 2004.
Tipo: Journal Contribution
Palavras-chave: Plankton; Community composition; Distribution; Phytoplankton; Zooplankton; Diatoms; Biomass; Cruises; Biomass; Plankton; Distribution; Phytoplankton; Zooplankton; Diatoms; Http://aims.fao.org/aos/agrovoc/c_926; Http://aims.fao.org/aos/agrovoc/c_5950; Http://aims.fao.org/aos/agrovoc/c_35773; Http://aims.fao.org/aos/agrovoc/c_13344; Http://aims.fao.org/aos/agrovoc/c_15490; Http://aims.fao.org/aos/agrovoc/c_32657.
Ano: 2006
URL: http://hdl.handle.net/1834/2331

Bloom de Noctiluca scintillans y Ceratium dens en el Golfo de Guayaquil (2004)
Provedor de dados: 20
Autores: Torres, G.; Palacios, C.
El objetivo de este estudio fue difundir las investigaciones del bloom de C. dens y N. scintillans ocurridos en el Golfo de Guayaquil como parte del Proyecto de Mareas Rojas desarrollado por el Instituto Oceanográfico de la Armada (INOCAR).
Tipo: Journal Contribution
Palavras-chave: Algal blooms; Red tides; Algae; Species diversity; Phytoplankton; Phytoplankton; Algal blooms; Algae; Species diversity; Http://aims.fao.org/aos/agrovoc/c_13344; Http://aims.fao.org/aos/agrovoc/c_32367; Http://aims.fao.org/aos/agrovoc/c_258; Http://aims.fao.org/aos/agrovoc/c_33954.
Ano: 2007
URL: http://hdl.handle.net/1834/2359

Distribución y abundancia del plancton estuarino en el Canal El Morro, Posorja (junio 2006)
Provedor de dados: 20
Autores: Torres, G.; Andrade, C.
El proyecto de "Gestión Ambiental de la Armada" en el área estuarina adyacente al reten Naval de Posorja, tuvo como objetivo realizar un muestreo de plancton y sus condiciones ambientales actuales, a fin de conservar los ecosistemas marino-costeros y su diversidad biológica para el beneficio de la población local, la ciencia y educación establecido en la estrategia de desarrollo sustentable adaptadas al Cambio Climático (Gaibor, et al., 2000).
Tipo: Journal Contribution
Palavras-chave: Phytoplankton; Zooplankton; Abundance; Estuaries; Geographical distribution; Phytoplankton; Zooplankton; Estuaries; Geographical distribution; Http://aims.fao.org/aos/agrovoc/c_13344; Http://aims.fao.org/aos/agrovoc/c_15490; Http://aims.fao.org/aos/agrovoc/c_2673; Http://aims.fao.org/aos/agrovoc/c_5083.
Ano: 2007
URL: http://hdl.handle.net/1834/2361

Variabilidad temporal del fitoplancton en áreas costeras del mar ecuatoriano y su interrelación con el evento La Niña 1999-2000, Ecuador
Provedor de dados: 20
Autores: Tapia, M.E.
La presente investigación tiene como objetivo conocer la variabilidad espacio temporal del fitoplancton y su interrelación con el evento La Niña 1999-2000 durante la época húmeda y seca considerando los parámetros ambientales: contajes celulares, abundancia relativa, en las estaciones fijas La Libertad y Manta.
Tipo: Journal Contribution
Palavras-chave: Temporal variations; Biological production; Phytoplankton; Upwelling; Abundance; El Nino phenomena; Cell counters; Biological production; Phytoplankton.
Ano: 2007
URL: http://hdl.handle.net/1834/2463

Floraciones algales nocivas en la bahía de Santiago de Cuba
Provedor de dados: 20
Autores: Gómez, L.; Díaz, U.; Fernández, A.; Licea, Y.; Álvarez, I.
Santiago de Cuba bay is an ecosystem eutrophic and vulnerable to FANs events. This work preset the results of monitoring during three year in eight stations located in the less polluted area of the bay, leading to the determination of the possible seasonal distribution and FANs frequency. 117 Phytoplankton species were identifying, which belong to 5 divisions; 28% of these species are reported as potentially toxic and/ or noxious. This zone of the bay classifies as politrophic, heterogeneous and dynamics. It highlights the cysts presence, as well as the occurrence of unialgal "blooms" of Gymnodinium catenatum and Cochlodinium polykrikoides, indicating the presence in the ecosystem of favorable conditions to HABs occurrence with negative impact on the...
Tipo: Conference Material
Palavras-chave: Cysts; Eutrophication; Phytoplankton; Algal blooms; Cysts; Eutrophication; Phytoplankton; Algal blooms; Http://aims.fao.org/aos/agrovoc/c_34811; Http://aims.fao.org/aos/agrovoc/c_2734; Http://aims.fao.org/aos/agrovoc/c_13344; Http://aims.fao.org/aos/agrovoc/c_32367.
Ano: 2006
URL: http://hdl.handle.net/1834/2251

Dinoflagelados del fitoplancton del Golfo de Guayaquil: II edición
Provedor de dados: 20
Autores: Pesantes, F.
Se analizaron 44 muestras de plancton identificándose 103 especies y variedades de Dinoflagelados. La mayoría de las especies registradas por primera vez para el mar ecuatoriano. El análisis sistemático de las especies incluye: descripción, dibujos, medidas y referencias bibliográficas. El presente trabajo se llevó a cabo con el auspicio del Instituto Oceanográfico de la Armada del Ecuador, mediante la colecciones de muestras de fitoplancton marino, realizadas a bordo del BAE "ORION" en cruceros costeros y océanicos que llevó a cabo según el plan quinquenal de investigaciones oceanográficas 1971-1975.
Tipo: Journal Contribution
Palavras-chave: Phytoplankton; Cruises; New taxa; Phytoplankton; Http://aims.fao.org/aos/agrovoc/c_13344.
Ano: 1983
URL: http://hdl.handle.net/1834/2113

Florecimiento de la diatomea potencialmente tóxica Pseudo-nitzschia cf.  multistriata en aguas cubanas
Provedor de dados: 20
Autores: Moreira González, A.
Algunas especies de diatomeas del género  Pseudo-nitzschia producen toxinas que causan envenenamiento amnésico por  mariscos. En abril de 2009, se observó un florecimiento de diatomeas en un área semicerrada de la bahía de Cienfuegos,  Cuba, en el que se identificó a la especie potencialmente tóxica Pseudo-nitzschia cf. multistriata, sin embargo no se observaron  efectos nocivos para la fauna marina ni fueron reportados síndromes de toxicidad en humanos. El presente trabajo describe  la composición y la concentración del fitoplancton en el área del florecimiento con enfásis en la especie Pseudo-nitzschia cf.  multistriata.
Tipo: Journal Contribution
Palavras-chave: Abundance; Bays; Diatoms; Phytoplankton.
Ano: 2013
URL: http://hdl.handle.net/1834/4920

Composition, Abundance and Seasonality of Zooplankton in Mida Creek, Kenya
Provedor de dados: 20
Autores: Osore, M.; Mwaluma, J.; Kamau, J.; Wawiye, P.
Samples were collected monthly at four fixed stations in Mida creek from May 1996 to April 1997, in order to determine the species composition, abundance and diversity of phytoplankton and zooplankton collected with 20- and 332-mm mesh size plankton nets respectively. Sampling also included measurement of salinity and temperature. Peaks in phytoplankton abundance occurred in May and January, following the long rains in April–May and the short rains in November–December. Zooplankton densities followed the phytoplankton peaks with the main peak occurring in February after the major phytoplankton bloom. Similarly, smaller peaks occurred in May and March. Copepods dominated the zooplankton forming up to 60% of total species composition. High zooplankton...
Tipo: Journal Contribution
Palavras-chave: Zooplankton; Midacreek; Phytoplankton; Abundance; Kenya; Zooplankton.
Ano: 2003
URL: http://hdl.handle.net/1834/949

Marea roja ocasionada por &lt;i&gt;Scripsiella trochoidea&lt;/i&gt; en el estuario del río Chone
Provedor de dados: 20
Autores: Coello, D.
Se presentan los resultados obtenidos durante un evento de marea roja en el estuario del río Chone y que las variables físicas, químicas, planctónicas y de contenido estomacal. Se considera que la marea roja registrada fue originada por &lt;i&gt;Scripsiella trochoidea&lt;/i&gt; y no habría tenido características tóxicas y que la mortalidad de chuhueco &lt;i&gt;Cetengraulis mysticetus&lt;/i&gt;, habría sido resultado de los descensos del oxígeno que habría provocado esta proliferación algal.
Tipo: Journal Contribution
Palavras-chave: Red tides; Mortality causes; Physicochemical properties; Stomach content; Phytoplankton.
Ano: 2010
URL: http://hdl.handle.net/1834/5381

Evaluación de las zonas con impacto antrópico del Golfo de Batabanó, Cuba. Empleo de índices de calidad.
Provedor de dados: 20
Autores: Martínez Canals, M.; Montalvo, J. F.; Lugioyo, G.M.; Loza, S.; Pérez, R.
Se realizó la evaluación de los posibles cambios ambientales debido a los impactos antrópicos que han ocurrido en los últimos años en este escenario y la redefinición de áreas que sufren afectaciones, teniendo en cuenta que cualquier alteración ambiental de este ecosistema, ya sea de origen natural o humano, puede tener una importante repercusión económica y social. A partir de los índices químicos y biológicos propuestos, las aguas del Golfo de Batabanó presentaron condiciones mesotróficas con tendencia a la eutrofización en cuatro áreas fundamentales. En los sedimentos del Golfo los valores de carbono orgánico (0.16-7.30 %) y sulfhídrico (12,19-22,90 μg/L) fueron característicos de fondos con altas concentraciones de materia orgánica. En el sector...
Tipo: Journal Contribution
Palavras-chave: Phytoplankton; Sediments; Heavy metals; Phytoplankton; Heavy metals; Http://aims.fao.org/aos/agrovoc/c_13344; Http://aims.fao.org/aos/agrovoc/c_2223.
Ano: 2006
URL: http://hdl.handle.net/1834/3340

Distribución cuali-cuantitativa del fitoplancton en el Pacífico sureste (3°16'-31°23'S), durante El Niño 1997-1998
Provedor de dados: 20
Autores: Torres, G.
El objetivo del presente artículo es estudiar la distribución de las concentraciones de clorofila "a" y feopigmentos en diciembre/97 y marzo/98, y cuales serían los indicadores biológicos del fitoplancton que han avanzado con la corriente cálida hacia el sur en diciembre/97, en condiciones de El Niño 97-98, en el Pacífico sudeste exceptuando la región peruana (Fig.1).
Tipo: Journal Contribution
Palavras-chave: Distribution; Phytoplankton; Biomass; Community composition; Diatoms; El Nino phenomena; Oceanographic stations; Chlorophylls; Distribution; Phytoplankton; Biomass; Diatoms; Chlorophylls.
Ano: 1998
URL: http://hdl.handle.net/1834/2393

Dinámica del ultrafitoplancton en el Mar Argentino
Provedor de dados: 20
Autores: Silva, R.I.
Ultraphytoplankton is composed by a group of organisms phylogenetically diverse, which contribute significantly to the total biomass and primary production in different oceanic and coastal pelagic systems. The success of ultraphytoplankton is attributed to its high efficiency in capturing light and nutrients, due to their small cell size and low sinking rate. The community structure is driven by the interaction among biotic and abiotic variables, such as temperature, nutrients, light and predators. The objective of this work was to assess the ecological importance of ultraphytoplankton organisms at the EPEA station, situated in the Buenos Aires coastal pelagic system (Argentina, SW Atlantic), during the period 2000-2009. In particular, ultraphytoplankton...
Tipo: Theses and Dissertations
Palavras-chave: Phytoplankton; Seasonal variations; Environmental factors; Community composition; Biomass; EPEA; Marine environment.
Ano: 2011
URL: http://hdl.handle.net/1834/4504

Algunas características del florecimiento del fitoplancton en el frente del Río de la Plata. I. Los sistemas nutritivos
Provedor de dados: 20
Autores: Negri, R.M.; Carreto, J.I.; Benavides, H.R.
During the spring (H-04/82: october 11-27, 1982)carried out by the Fishery Research Vessel "Dr.E.Holmberg", the distribution of temperature, salinity, nutrients concentration and photosynthetic pigments were studied at the "Rio de la Plata" maritime front. The presence of Sub-Tropical coastal waters in only station did not allow its characterization. Low Chlorophyll a concentration were noted, in association with scarce concentrations of nutrients and high Margalef index values.
Tipo: Journal Contribution
Palavras-chave: Phytoplankton; Abiotic factors; Water masses; Phosphates; Silicates; Nitrates; Chlorophylls; Estuarine front; Phytoplankton; Nitrates; Nutrients; Phosphates; Silicates; Chlorophylls.
Ano: 1986
URL: http://hdl.handle.net/1834/2041

Distribución del fitoplancton y su comportamiento en el afloramiento en las Islas Galápagos
Provedor de dados: 20
Autores: Torres, G.; Tapia, M.E.
Los objetivos de este crucero han sido colectar información que permitirá comprender mejor la dinámica poblacional (cuali-cuantitativo) de las diferentes masas de aguas que afloran al este y al oeste de las Islas Galápagos y su interacción entre las islas, estos resultados permitirán dar una mejor apreciación sobre áreas de mayor fertilidad marina ( clorofila "a", contajes celulares), organismos indicadores del afloramiento y su posible asociación con áreas de riqueza ictiológica.
Tipo: Journal Contribution
Palavras-chave: Phytoplankton; Chlorophylls; Biological production; Indicator species; Ichthyoplankton; Cruises; Population dynamics; Phytoplankton; Biological production; Chlorophylls; Indicator species; Population dynamics; Http://aims.fao.org/aos/agrovoc/c_13344; Http://aims.fao.org/aos/agrovoc/c_36649; Http://aims.fao.org/aos/agrovoc/c_1577; Http://aims.fao.org/aos/agrovoc/c_35790; Http://aims.fao.org/aos/agrovoc/c_6111.
Ano: 2000
URL: http://hdl.handle.net/1834/2240

Efecto de la fertilización orgánica e inorgánica sobre el comportamiento del fitoplancton en la estación acuícola de Boca Ambuila (Cuba) -
Provedor de dados: 20
Autores: Jaime Ceballos, B.; Galindo López, J.; Nodar Pérez, R.
Con el objetivo de optimizar el empleo de fertilizantes en la preparación de los estanques de tierra de la Estación de Boca Ambuila, Cienfuegos, Cuba y garantizar un crecimiento adecuado de la productividad natural, se desarrolló un diseño experimental completamente aleatorizado, con 4 tratamientos y tres repeticiones, durante 6 días para evaluar el efecto de diferentes fertilizantes y dosis sobre el desarrollo del fitoplancton. Las mayores concentraciones de células de fitoplancton y los mejores valores de los índices poblacionales evaluados, se alcanzaron cuando se utilizaron Nutrilake (26 mg/L) y Vacasa (10 mg/L). Es necesario realizar ensayos en otras épocas y evaluar otros fertilizantes en la Estación de Boca Ambuila.
Tipo: Journal Contribution
Palavras-chave: Aquaculture; Phytoplankton; Aquaculture; Phytoplankton; Http://aims.fao.org/aos/agrovoc/c_550; Http://aims.fao.org/aos/agrovoc/c_13344.
Ano: 2007
URL: http://hdl.handle.net/1834/2620

Bio-oceanografía en el entorno de la isla de La Plata, durante agosto/2001
Provedor de dados: 20
Autores: Torres, G.; Calderón, T.; Calderón, G.; Franco, V.; Correa, C.
El objetivo de la presente investigación, fue dar un comprensivo entendimiento de las condiciones bio-oceanográficas del fitoplancton-zooplancton-ictioplancton, y las interacciones con el medio circundante (físico, químico), procesos que son complicados cuando involucran aspectos hidrográficos costeros como áreas de afloramiento, áreas de pesca y áreas de soporte alimentario para los diferentes recursos marinos costeros planctónicos-bentónicos y aves-mamíferos marinos.
Tipo: Journal Contribution
Palavras-chave: Marine ecology; Phytoplankton; Zooplankton; Ichthyoplankton; Upwelling; Biological production; Marine resources; Cruises; Oceanic islands; Coastal zone; Marine resources; Phytoplankton; Zooplankton; Biological production; Marine ecology; Http://aims.fao.org/aos/agrovoc/c_28012; Http://aims.fao.org/aos/agrovoc/c_13344; Http://aims.fao.org/aos/agrovoc/c_15490; Http://aims.fao.org/aos/agrovoc/c_36649; Http://aims.fao.org/aos/agrovoc/c_4609.
Ano: 2004
URL: http://hdl.handle.net/1834/2318

Distribución del fitoplancton en el Estrecho Bransfield, Bahía Chile y Paso Drake, durante el verano austral 1998 (Antártida)
Provedor de dados: 20
Autores: Tapia, M.E.; Torres Ch., G.
El principal objetivo fue de conocer la disponibilidad de la reserva alimenticia (fitoplancton), como un factor que puede influenciar la distribución y abundancia del krill antártico, registrados durante la VII Expedición Ecuatoriana a la Antártida en enero/1998 en el B/I ORION (INOCAR). La biomasa fitoplanctónica en el Estrecho Bransfield, registró altas concentraciones hacia el sur oeste del estrecho dominado principalmente por Cryptomonas spp. entre 1000.000 a 2200.000 cel/l, las menores concentraciones se registraron hacia las Islas Shetland del Sur entre 575.000 a 693.000 cel/l. compuestas principalmente por las diatomeas, Nitzschia delicatissima, N. longissima, Thalassiosira spp., y el Dinoflagelado gymnodinium spp., los cuales se presentaron...
Tipo: Journal Contribution
Palavras-chave: Distribution; Availability; Abundance; Diatoms; Phytoplankton; El Nino phenomena; Distribution; Phytoplankton; Diatoms.
Ano: 1998
URL: http://hdl.handle.net/1834/3852

Effet du Benzo(a)pyrène sur la communauté phytoplanctonique du canal et de la lagune de Bizerte
Provedor de dados: 20
Autores: Ben Othman, H.; Meddeb, M.; Hadj Mabrouk, H.; Hlaili, S.
La lagune de Bizerte devient un récepteur privilégié des micropolluants dont certains sont toxiques et peuvent constituer une menace pour l’équilibre de cet écosystème. Parmi ces polluants, les hydrocarbures aromatiques polycycliques (HAP) sont retenus comme des polluants prioritaires. La présente étude est une première investigation de l’effet d’un HAP, le Benzo(a)pyrène [B(a)py], sur la communauté phytoplanctonique au niveau d’une station lagunaire (station plus ou mois polluée par le B(a)py) et une station au niveau du canal (station la plus polluée par le B(a)py) en été (juillet) et automne (novembre) 2009. Pour cela, des communautés phytoplanctoniques, collectées des deux stations, ont été maintenues en culture pendant 6 jours sous trois différents...
Tipo: Journal Contribution
Palavras-chave: Phytoplankton; Chlorophylls.
Ano: 2013
URL: http://hdl.handle.net/1834/5922

Aspectos ecológicos del plancton en las riberas del humedal Isla Santay, Río Guayas durante los años 2000 y 2002
Provedor de dados: 20
Autores: Tapia, M.E.; Naranjo, Ch.
El objetivo del presente estudio es conocer la distribución cualitativa y cuantitativa de las especies del fitoplancton, zooplancton e ictioplancton y su relación con las condiciones ambientales durante el período en estudio.
Tipo: Journal Contribution
Palavras-chave: Species diversity; Plankton; Phytoplankton; Zooplankton; Ichthyoplankton; Biomass; Abundance; Biological production; Marine ecology; Temporal variations; Plankton; Phytoplankton; Zooplankton; Biomass; Biological production; Species diversity; Marine ecology; Http://aims.fao.org/aos/agrovoc/c_5950; Http://aims.fao.org/aos/agrovoc/c_13344; Http://aims.fao.org/aos/agrovoc/c_15490; Http://aims.fao.org/aos/agrovoc/c_926; Http://aims.fao.org/aos/agrovoc/c_36649; Http://aims.fao.org/aos/agrovoc/c_33954; Http://aims.fao.org/aos/agrovoc/c_4609.
Ano: 2007
URL: http://hdl.handle.net/1834/2371

Spatial-temporal variability of phytoplankton abundance and species composition in Lake Victoria, Kenya: implication for water quality management
Provedor de dados: 20
Autores: Abuodha, J.; Mwirigi, P.; Gikuma-Njuru, P.; Okungu, J.; Hecky, R.E.
Study of phytoplankton abundance and species composition in Lake Victoria, Kenya showed a marked difference between the main lake and the semi-closed Nyanza (Winam) Gulf. Phytoplankton biomass and species composition showed both spatial and seasonal variation. In the main lake the highest chlorophyll concentration was during the short stratification season (August to September) but in the gulf it was after the short and long rainy seasons. Deep mixing depth (aprox. 30 m) in the main lake imposes light limitation to algal growth leading to the observed lower chlorophyll in the main lake, despite the higher soluble reactive phosphorus (SRP) in the main lake compared to the gulf. Blue green algae were the most abundant algal species, contributing between 45...
Tipo: Proceedings Paper
Palavras-chave: Phytoplankton; Water quality; Geographical distribution; Phytoplankton; Water quality; Http://aims.fao.org/aos/agrovoc/c_13344; Http://aims.fao.org/aos/agrovoc/c_16061.
Ano: 2006
URL: http://hdl.handle.net/1834/1471

Productividad del fitoplancton en la Bahía de Santa Elena, Ecuador durante mayo del 2006
Provedor de dados: 20
Autores: Tapia, M.E.
Se presentan las investigaciones de clorofila a contajes celulares y análisis cualitativos (red 50u), que utilizados simultáneamente aportaron valiosa información ecológica sobre la comunidad del fitoplancton realizadas en 27 estaciones en la bahía de Santa Elena efectuado en mayo de 2006. Se identificaron 50 especies en muestras de agua y 62 especies en muestras de red (50u), en la comunidad del fitoplancton. Las diatomeas fueron dominantes y en menor concentración los dinoflagelados, cocolitofóridos, cianobacterias y tintinnidos. Las especies de mayor ocurrencia en el área en estudio fueron Thalassiosira subtilis y Pseudo-nitzschia delicatissima observadas en los contajes celulares. En muestras de red (50u), se registraron especies típicas de ambiente...
Tipo: Journal Contribution
Palavras-chave: Phytoplankton; Chlorophylls; Biological production; Diatoms; Phytoplankton; Biological production; Chlorophylls; Diatoms; Http://aims.fao.org/aos/agrovoc/c_13344; Http://aims.fao.org/aos/agrovoc/c_36649; Http://aims.fao.org/aos/agrovoc/c_1577; Http://aims.fao.org/aos/agrovoc/c_32657.
Ano: 2009
URL: http://hdl.handle.net/1834/3349

Modèle couple dynamique-écologie pour la lagune de Bizerte
Provedor de dados: 20
Autores: Béjaoui, B.; Harzallah, A.; Moussa, M.; Chapelle, A.
Ce travail porte sur le développement d’un modèle hydroécologique tridimensionnel basé sur deux éléments nutritifs l’azote et le phosphore. Le modèle hydrodynamique est forcé par des données climatiques mensuelles NOAA. Le modèle écologique a été développé en se basant sur deux éléments nutritifs l’azote et le phosphore en interaction avec le phytoplancton et le zooplancton. Le modèle écologique est constitué de deux compartiments, la colonne d’eau et la couche supérieure de sédiment. Huit variables d’états caractérisent la colonne d’eau et six le compartiment sédiment. Comme première application, le modèle a été testé sur la lagune de Bizerte. Une comparaison entre les résultats des simulations et les observations a montré que le modèle a pu reproduire...
Tipo: Journal Contribution
Palavras-chave: .; Dissolved oxygen; Hydrodynamics; Models; Nutrient cycles; Phytoplankton; Zooplankton; Dissolved oxygen; Models; Phytoplankton; Zooplankton; Hydrodynamics; Http://aims.fao.org/aos/agrovoc/c_36106; Http://aims.fao.org/aos/agrovoc/c_4881; Http://aims.fao.org/aos/agrovoc/c_13344; Http://aims.fao.org/aos/agrovoc/c_15490; Http://aims.fao.org/aos/agrovoc/c_3723.
Ano: 2008
URL: http://hdl.handle.net/1834/3694

Análisis comparativo del estado trófico  de las aguas en la costa oriental de la provincia de Cienfuegos, Cuba.
Provedor de dados: 20
Autores: Seisdedo, M.; Moreira, A.; Arencibia, G.; Pérez, I.
El propósito de este trabajo es evaluar el estado trófico de las aguas en la costa oriental de la provincia de  Cienfuegos, a partir de las concentraciones de nutrientes y del fitoplancton. Se utilizaron dos métodos de  evaluación del estado trófico y se consideraron los resultados de nitrógeno inorgánico (NI), fósforo inorgánico  (FI), Si y fitoplancton, los cuales se obtuvieron durante cuatro campañas de muestreo llevadas a cabo en el  período 2006-2007. Se analizó la proporción elemental disponible Si/NI según criterio de Redfield, así como  también se obtuvieron los coeficientes de correlaciones  entre las concentraciones de nutrientes y  fitoplancton. Los resultados mostraron al Si como el nutriente más disponible en el área de estudio y a las...
Tipo: Journal Contribution
Palavras-chave: Trophic status; Nutrients (mineral); Phytoplankton; Coastal zone.
Ano: 2010
URL: http://hdl.handle.net/1834/4529

Suplemento a "Los dinoflagelados del Atlántico Sudoccidental"
Provedor de dados: 20
Autores: Balech, E.; Akselman, R.; Negri, R.M.
The present work is a supplement of the monography "The dinoflagellates of the Southwestern Atlantic" by E. Balech (in press). Eightenn species belonging to the genera Ceratium, Dinophysis, Diplopelta, Gonyaulax, Heterochisma. Oblea, Oxyphysis, and Protoperidinium are discussed on accurt of their presence, up to the present unknown in the area. Comments on their geographical distributions, ecological requirements and morphological details are included in the work.
Tipo: Journal Contribution
Palavras-chave: Organism morphology; Geographical distribution; New records; Phytoplankton; Geographical distribution; Phytoplankton; Http://aims.fao.org/aos/agrovoc/c_5083; Http://aims.fao.org/aos/agrovoc/c_13344.
Ano: 1984
URL: http://hdl.handle.net/1834/2042

Les efflorescences phytoplanctoniques dans le golfe de Gabes (Tunisie) au cours de dix ans de surveillance (1995-205)
Provedor de dados: 20
Autores: Feki, W.; Hamza, A.; Bel Hassen, M.; Rebai, A.
Les données du Réseau National de Surveillance Phytoplanctonique ont été examinées dans le golfe de Gabes durant la période 1995-2005. Un intérêt particulier a été attribué au phénomène de bloom phytoplanctonique. En outre, nous avons examiné plus spécifiquement les variations spatio-temporelles des espèces responsables et les relations avec la variabilité des conditions abiotiques, essentiellement la température, la salinité et le pH. Les résultats ont montré que la période allant d’août à janvier, avec des pics en septembre et janvier, semble être propice à des efflorescences algales. Les dinoflagellés sont responsables de 89% des cas ; l’espèce Karenia selliformis détient à elle seule 64% des occurrences de ce phénomène. Les blooms de K. selliformis,...
Tipo: Journal Contribution
Palavras-chave: Algal blooms; Environmental conditions; Phytoplankton; Salinity; PH.
Ano: 2008
URL: http://hdl.handle.net/1834/4259

Distribución de la biomasa de las fracciones planctónicas &lt; 200 μM y su contribución relativa a la biomasa total en las aguas oceánicas de la región noroccidental de Cuba.
Provedor de dados: 20
Autores: Orozco, M.V.; Loza, S.; Lugioyo, M.
Se evaluó el patrón de distribución espacial así como la contribución de las fracciones del plancton a la biomasa planctónica menor de 200 μm en la región NW de las aguas oceánicas adyacentes a Cuba en muestreos realizados en época de invierno (febrero de 1997 y marzo 1999). Los valores de la biomasa bacteriana variaron entre 1.6 y 11.4 mgC m-3, del nanoplancton entre 5.2 y 20.8 mgC m-3 (Xmedia = 11.4 ± 5.4 mgC m-3) y la del microzooplancton entre 4.2 y 15.5 mgC m-3 (Xmedia = 7.9 ± 3.2 mgC m-3). El microfitoplancton presentó valores de biomasa que variaron entre 1.95 y 15.7 mgC m-3 (Xmedia = 8.8 ± 3.7 mgC m-3). Los mayores valores de biomasa de todas las fracciones estudiadas se encontraron en las aguas oceánicas adyacentes a la zona entre las bahías de...
Tipo: Journal Contribution
Palavras-chave: 1461; Biomass; Bacteria; Nanoplankton; Oceanic waters; Zooplankton; Phytoplankton; Biomass; Bacteria.
Ano: 2009
URL: http://hdl.handle.net/1834/4119

Abundancia y distribución del ictioplancton, fito y zooplancton en el mar ecuatoriano en abril de 1995
Provedor de dados: 20
Autores: Luzuriaga de Cruz, M.; Elías, E.; Flores, M.E.
El presente trabajo trata de la distribución de la abundancia de huevos y larvas de peces en relación con la abundancia del zooplancton y fitoplancton colectado en 13 estaciones muestreadas a bordo del B/I TOHALLI durante el crucero pelágico-oceanográfico realizado en abril de 1995. Se analizó un total de 12820 huevos de peces. (10m²)¹ y 5145 larvas de peces (10m²)¹. La mayor abundancia de huevos y larvas de peces se localizó al este de las Islas Galápagos, en las estaciones 1P y 10, situadas en los extremos norte y sur del área de muestreo a la altura de la Isla San Cristóbal, con 5226 huevos (10m²)¹ y 1042 larvas (10m²)¹, respectivamente, mientras que la menor abundancia se localizó también al este de la Islas Galápagos, en las estaciones 7 y 5 con 109...
Tipo: Journal Contribution
Palavras-chave: Abundance; Ichthyoplankton; Phytoplankton; Zooplankton; Cruises; Fish eggs; Fish larvae; Phytoplankton; Zooplankton; Fish larvae; Http://aims.fao.org/aos/agrovoc/c_13344; Http://aims.fao.org/aos/agrovoc/c_15490; Http://aims.fao.org/aos/agrovoc/c_2924.
Ano: 1998
URL: http://hdl.handle.net/1834/2278

Los dinoflagelados como indicadores de "El Niño" en el mar ecuatoriano
Provedor de dados: 20
Autores: Pesantes, F.
En el presente trabajo se determina la distribución de los dinoflagelados por medio de un análisis cualitativo y de abundancia relativa, calculándose además de su diversidad. Se considera especies de dinoflagelados, indicadoras de los avances hacia el sur del agua cálida ecuatorial y de baja salinidad que apareció frente a las costas de Ecuador en Diciembre de 1972, año conocido como de "El Niño". Los resultados se relacionan con algunas condiciones hidrográficas coincidentes con la predominancia de los dinoflagelados. Así mismo se compara y se discuten estos antecedentes con la información disponible en relación a la presencia de otros organismos planctónicos típicos de aguas ecuatoriales y que también aparecieron durante Diciembre de 1972 en el mar...
Tipo: Journal Contribution
Palavras-chave: Distribution; Phytoplankton; Distribution; Phytoplankton; Http://aims.fao.org/aos/agrovoc/c_35773; Http://aims.fao.org/aos/agrovoc/c_13344.
Ano: 1983
URL: http://hdl.handle.net/1834/2092

Diagnóstico del plancton en el estuario de San Lorenzo en agosto 2006 (Esmeraldas-Ecuador)
Provedor de dados: 20
Autores: Torres, G.; Andrade, C.
Se realizó un monitoreo del plancton en el estuario de San Lorenzo en junio 2006. En los resultados se registró 128 especies del fitoplancton (método cuantitativo) y 50 especies (cualitativo). Las diatomeas más representativas fueron S. costatum, T. nitzschioides, P. longissima, L. danicus, Navicula sp., P. sulcata: T. nitzschioides. Thalassiosira sp. y flagelados (cuantitativo); S. costatum, Coscinodiscus sp., N. sigma y P.  Sulcata (cualitativo). La presencia de Gymnodinium sp. P. maximun y M. rubrum podría asociarse con la formación de mareas rojas al interior del estuario. En los resultados del zooplancton registrarón 16 taxas constituidos mayoritariamente por Zoeas de Brachiura y Copépodos, distribudidos en toda el área de estudio principalmente en...
Tipo: Journal Contribution
Palavras-chave: Plankton; Diatoms; Phytoplankton; Zooplankton; Biomass; Fish larvae; Eggs; Abundance; Estuaries; Species diversity; Zooplankton; Biomass; Eggs; Estuaries; Plankton; Phytoplankton; Fish larvae; Species diversity; Diatoms; Http://aims.fao.org/aos/agrovoc/c_15490; Http://aims.fao.org/aos/agrovoc/c_926; Http://aims.fao.org/aos/agrovoc/c_2502; Http://aims.fao.org/aos/agrovoc/c_2673; Http://aims.fao.org/aos/agrovoc/c_5950; Http://aims.fao.org/aos/agrovoc/c_13344; Http://aims.fao.org/aos/agrovoc/c_2924; Http://aims.fao.org/aos/agrovoc/c_33954; Http://aims.fao.org/aos/agrovoc/c_32657.
Ano: 2007
URL: http://hdl.handle.net/1834/2378

Towards the development of environmental indices for the Namibian shelf, with particular reference to fisheries management.
Provedor de dados: 20
Autores: Bartholomae, Ch.; Van der Plas, A.
The Namibian Ministry of Fisheries and Marine Resources has the task of collecting and providing relevant oceanographic information for management of their fisheries. However, quality information is difficult to provide because of the complexity of the processes involved in the Namibian marine ecosystem. Nonetheless, there are oceanographic data available that can contribute to fisheries management by improving the general understanding of important oceanographic processes related to fisheries. The focus of this paper is on the development of simple environmental indices that can serve as a measurement or proxy of the state or intensity of certain important oceanographic processes or variables for temporal comparison. These indices relate to oceanographic...
Tipo: Journal Contribution
Palavras-chave: Fisheries management; Marine resources; Oceanographic data; Chlorophylls; Upwelling; Spatial variations; Sardine fisheries; Water temperature; El Nino phenomena; Ecosystems; Fish stocks; Surface temperature; Oxygen; Phytoplankton; Biomass; Seasonal variations; Fronts; Perturbations; Commercial fisheries; Catchability; Remote sensing; Chlorophylls; Dissolved oxygen; Environmental impact.
Ano: 2007
URL: http://hdl.handle.net/1834/4971

Distribución y abundancia de diatomeas del género Pseudo Nitzschia en condición de el Niño 2007 sobre la cuenca pacífica colombiana
Provedor de dados: 20
Autores: Galeano-Ch., Ana M.; Arteaga-S., Edgar.
Se describe la distribución espacial y abundancia de diatomeas pertenecientes al género Pseudo-nitzschia en la cuenca pacífica colombiana (CPC) durante la campaña oceanográfica PACÍFICO XLIV-ERFEN XLII, evaluando su comportamiento frente a las variables de temperatura y salinidad. Se realizaron muestreos de fitoplancton (con botellas Niskin de 5 L) a dos profundidades (superficial y 50 m) en 25 estaciones. Se observó que en superficie se registraron las mayores abundancias del género distribuyéndose especialmente en la zona intermedia de la CPC. Este patrón de distribución coincidió con valores bajos de temperatura y altos en salinidad. Debido a lo anterior, se encontraron diferencias significativas en la abundancia de Pseudo-nitzschia entre las dos...
Tipo: Journal Contribution
Palavras-chave: Distribution; Abundance; Phytoplankton; Algae; Distribution; Phytoplankton; Algae; Http://aims.fao.org/aos/agrovoc/c_35773; Http://aims.fao.org/aos/agrovoc/c_13344; Http://aims.fao.org/aos/agrovoc/c_258.
Ano: 2010
URL: http://hdl.handle.net/1834/3744

Variabilidad anual del fitoplancton marino en áreas costeras de La Libertad y Manta (Ecuador), su inter-relación con eventos El Niño
Provedor de dados: 20
Autores: Torres, G.
En este artículo se describen los resultados anuales de la biomasa fitoplanctónica cuantitativa (primer nivel trófico), períodos de mayor densidad fitoplanctónica anual en dos estaciones fijas de Manta (1991-1997), La Libertad (1994-1997) y su inter-relación en condiciones frías de 1996 y eventos cálidos El Niño en 1991-92 y 1997.
Tipo: Journal Contribution
Palavras-chave: Variability; Distribution; Biomass; Phytoplankton; El Nino phenomena; Distribution; Biomass; Phytoplankton.
Ano: 1998
URL: http://hdl.handle.net/1834/2328

Especies planctónicas marinas como bioindicadoras de masas de agua frente a la costa ecuatoriana durante el evento El Niño 2009-2010
Provedor de dados: 20
Autores: Cruz, M.; Tapia, M.E.; Naranjo, Ch.
Con la finalidad de determinar la influencia del evento El Niño 2009-2010 que se dsarrolló en elas regiones Niño 1+2 y 3.4, en base a los organismos indicadores de masas de aguas para determinar la intensidad y efectos en la costa ecuatoriana, se utilizaron cinco grupos de organismos planctónicos: Diatomeas, Dinoflagelados, Quetognatos, Pterópodos, Heterópodos y las concentraciones de clorofila a antes, durante y después del evento El Niño 2009-2010. En el primer trimestre del 2009 se registró una alta producción primaria, mientras que desde septiembre a noviembre se observó la más baja productividad del mar, en las estaciones fijas La Libertad como en Manta.En la estación fija de La Libertad, durante todo el 2009 predominaron especies de fitoplancton que...
Tipo: Journal Contribution
Palavras-chave: Phytoplankton; Zooplankton; Indicator species; Diatoms; Primary production; El Nino phenomena; Water masses.
Ano: 2010
URL: http://hdl.handle.net/1834/4213

Influence of barley straw and submerged macrophytes on fishpond wastewater quality
Provedor de dados: 20
Autores: Ghobrial, M.G.; Okbah, M.A.; Gharib, S.M.; Soliman, A.M.
Barley straw has received, recently, considerable attention as an algicide, which could be used to control algal growth in fishponds. It is regarded as cost-effective, user friendly and environmentally sounds. On the other hand, the submerged wetland macrophytes are crucial for the stabilization of clear water state in shallow lakes, by their active production of anti-algal compounds (allelochemicals) through allelopathy. Microcosm experiments using barley straw and the submerged macrophytes: Najas marina L., Potamogeton pectinatus L. and Ceratophyllum demersum L. in culture media with fishpond water were carried out outdoors to simulate the situation as natural as possible. Nutrients concentrations were measured beside the analysis of phytoplankton and...
Tipo: Journal Contribution
Palavras-chave: Field study; Phytoplankton; Fish ponds; Phytoplankton; Fish ponds; Http://aims.fao.org/aos/agrovoc/c_13344; Http://aims.fao.org/aos/agrovoc/c_2929.
Ano: 2007
URL: http://hdl.handle.net/1834/2210

Revisión de los taxones del género Neoceratium F. Gómez, De Moreira et P. López-García (Dinophyceae) y primer registro de N. dens en el mar Caribe colombiano
Provedor de dados: 20
Autores: Vidal, L. A.; Lozano-Duque, Y.
Se presenta una síntesis de los taxones del género Neoceratium hallados en un transecto a lo largo de la costa Caribe colombiana, en las bahías de Gaira y Santa Marta y en la Ciénaga Grande de Santa Marta. Con base en una extensiva revisión bibliográfica, se encontró que de los 65 taxones del género Neoceratium registrados en este estudio, 56 lo han sido ya para el mar Caribe colombiano y los nueve restantes son registros nuevos para la región. Neoceratium arietinum f. gracilentum, N. breve var. curvulum, N. humile, N. symmetricum var. coarctatum, N. longissimum y N. horridum, burceros &gt; horridum se registran por primera vez para el Caribe colombiano. Neoceratium dens, sin registros en el Atlántico y mares adyacentes, se encuentra pro primera vez par...
Tipo: Journal Contribution
Palavras-chave: Phytoplankton; Neoceratium des; Dinophyceae.
Ano: 2011
URL: http://hdl.handle.net/1834/4404

Mareas rojas durante 1989-1999, en aguas ecuatorianas
Provedor de dados: 20
Autores: Torres, G.
En el presente artículo se va a referir principalmente a los eventos de Marea Roja (MR) registrados entre 1989-1999 (Fig. 1y2).
Tipo: Journal Contribution
Palavras-chave: Red tides; Phytoplankton; Public health; Phytoplankton; Public health; Http://aims.fao.org/aos/agrovoc/c_13344; Http://aims.fao.org/aos/agrovoc/c_6349.
Ano: 2000
URL: http://hdl.handle.net/1834/2242

Estimaciones satelitales de clorofila y los frentes oceánicos del Atlántico Sudoccidental
Provedor de dados: 20
Autores: Romero, S.I.
Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales (Argentina)
Tipo: Theses and Dissertations
Palavras-chave: Chlorophylls; Continental shelves; Shelf fronts; Estuarine front; Shelf edge fronts; Variability; Phytoplankton; Photosynthesis; Satellite sensing; Phytoplankton; Chlorophylls; Continental shelves; Photosynthesis; Http://aims.fao.org/aos/agrovoc/c_13344; Http://aims.fao.org/aos/agrovoc/c_1577; Http://aims.fao.org/aos/agrovoc/c_32413; Http://aims.fao.org/aos/agrovoc/c_5812.
Ano: 2008
URL: http://hdl.handle.net/1834/2827

eventualité d’un transfert du phytoplancton toxique des milieux portuaires du golfe de gabè vers les zones de production de coquillage
Provedor de dados: 20
Autores: Hamza, A.; Dammak-Zouari, H.; Bouain, A.
Il est connu que les ports soumis à un trafic maritime intense réceptionnent éventuellement les eaux de ballast des navires en provenance de diverses contrées océaniques. De part le monde, le transfert et l’invasion de plusieurs espèces nuisibles  via  le déversement des eaux de ballast et le fouling des coques des navires ont été amplement mis en cause ces derniers temps. Ces introductions peuvent causer de nombreux dégâts aux secteurs avoisinants et notamment dans les zones de production des coquillages surtout si les espèces introduites sont constituées de phytoplancton toxique. Au terme de  4 années de suivi de la qualité phytoplanctonique des milieux portuaires du golfe de Gabès, nous avons pu  inventorier certaines espèces toxiques pour la plupart...
Tipo: Journal Contribution
Palavras-chave: Ballast; Ecology; Ecosystems; Eutrophication; Phytoplankton; Pollution monitoring; Toxicity.
Ano: 2006
URL: http://hdl.handle.net/1834/4271

Notas acerca del fitoplancton de la Laguna Guanaroca, Cienfuegos, Cuba
Provedor de dados: 20
Autores: Moreira González, A.; Betancourt, C.; Toledo, L.; Barcia, S.; Comas, A.
La Laguna Guanaroca es parte de la única Área Protegida de la provincia de Cienfuegos, Cuba. Se estudió el fitoplancton y  algunos parámetros físico-químicos en seis estaciones de este ecosistema, en el mes de noviembre de 2004. Las muestras se  preservaron con lugol ácido. La abundancia expresada como densidad fue determinada usando la técnica de sedimentación  para concentrar el fitoplancton. Todos los organismos fueron contados con un microscopio binocular usando una cámara de  conteo celular Sedgewick-Rafter. En general, se registraron valores altos de salinidad, conductividad eléctrica, sólidos  disueltos, cloruros y sulfatos. Los valores de oxígeno disuelto estuvieron en el rango de 4,75 a 7,66 mg/l y los valores de  DBO5 \ estuvieron entre 7,0 y...
Tipo: Journal Contribution
Palavras-chave: Phytoplankton.
Ano: 2013
URL: http://hdl.handle.net/1834/4922

Prorocentrum mexicanum Osorio-Tafall y Prorocentrum rhathymum  Loeblich III, Sherley &amp; Schmidt cohabitan en aguas cubanas
Provedor de dados: 20
Autores: Moreira González, A.
Algunas especies planctónicas de Prorocentrum pueden formar extensas mareas rojas pero la mayoría de las especies tóxicas  de este género son bentónicas. En la literatura reciente, una de las más comunes especies bentónicas tóxicas reportada como  Prorocentrum  mexicanum  ha sido re-investigada y se concluyó que el nombre correcto para esta especie es  Prorocentrum  rhathymum  mientras que  P.  mexicanum  es una especie planctónica no tóxica diferente, claramente diferenciada por su  morfología y el patrón formado por sus poros valvares. En un monitoreo reciente en la bahía de Cienfuegos, región centro-sur  de Cuba, se observaron poblaciones de  P. mexicanum en el plancton y  P.  rhathymum  como epífito sobre macroalgas. El  presente estudio describe...
Tipo: Journal Contribution
Palavras-chave: Phytoplankton; Toxicity.
Ano: 2013
URL: http://hdl.handle.net/1834/4924

Composición del fitoplancton frente a la costa ecuatoriana durante septiembre de 1995
Provedor de dados: 20
Autores: Prado, M.
During the period 6th - 13th of september 1995, the National Fisheries Institute carried out an oceanographic cruise in the Gulf of Guayaquil area and at the northern ecuadorian coast from 3~'10'S and 00~' latitude to 80~'- 82~'W longitude. During the survey, 22 planktological stations were carried out. Vertical towings in the water colum of 50 m depth were also made, using a net of 55~km. A total of 109 species were identified. High concentrations of diatoms and dinoflagellates were observed along the sampling area. The most common species were Proboscia alata, Rhizosolenia styliformis, Ornithocercus steinu and Ceratium tripos. It was also determined a high fertilitty area (1,3 x 106 cel.m-3). Yet, this indicates the presence of an equatorial undercurrent...
Tipo: Journal Contribution
Palavras-chave: Phytoplankton; Geographical distribution; Composition; Phytoplankton; Geographical distribution; Http://aims.fao.org/aos/agrovoc/c_13344; Http://aims.fao.org/aos/agrovoc/c_5083.
Ano: 1996
URL: http://hdl.handle.net/1834/2965

Distribución de clorofila a y feopigmentos en los canales australes chilenos comprendidos entre Puerto Montt y la laguna San Rafael, Chile
Provedor de dados: 20
Autores: Ramírez, B.; Pizarro, E.
La distribución de clorofila a y su relación con feopigmentos se describe para 98 estaciones localizadas en los fiordos chilenos comprendidos entre 41º a 46º S. Además, es relacionada con la disponibilidad de luz y con la información existente de temperatura, nutrientes, oxígeno y de biomasa planctónica. Las mayores concentraciones de clorofila (&gt;5 mg m–3) se detectaron hasta 25 m, coincidente con una baja concentración de feopigmentos y 50% de luz. Sus más bajas concentraciones (&lt;0,5 mg m–3), fueron detectadas entre 50 y 100 m y asociadas con altos valores de la proporción feopigmento-clorofila. Se establecen cuatro zonas de abundancia de clorofila. La primera tiene concentraciones entre 1,5 y 5 mg m–3, localizadas en seno Reloncaví y golfo de...
Tipo: Journal Contribution
Palavras-chave: Phytoplankton; Chlorophylls; Fjords; Phytoplankton; Fjords; Chlorophylls; Http://aims.fao.org/aos/agrovoc/c_13344; Http://aims.fao.org/aos/agrovoc/c_16314; Http://aims.fao.org/aos/agrovoc/c_1577.
Ano: 2005
URL: http://hdl.handle.net/1834/3147

Distribución del fitoplancton frente a la costa del Ecuador durante noviembre 1995
Provedor de dados: 20
Autores: Coello, D.
During the oceanographic cruises (T95/10/04 DO, B/I Tohalli) which were carried out during the period between the 2nd-6nd of november 1995, along the from the coast at 81~'20'W and between 01~'10' to 03~'20'S, 17 differents phytoplankton station, were surveyed for each station vertical drags were done in a water colum of 50 m depth by using of 47,5 cm diameter, 130 cm long and 55~km of light ned. The cualitative and quantitative plankton analysis shown that the studied area correspond to biological fertility region with Rhizosolenia styliformis, Coscinodiscus marginatus an Ceratium tripos as the dominant spacies. An area of phytoplankton activity is identifie as of having an outcrop origine (station 7, 8 and 9). The station that presented the major...
Tipo: Journal Contribution
Palavras-chave: Phytoplankton; Geographical distribution; Continental shelves; Phytoplankton; Geographical distribution; Continental shelves; Http://aims.fao.org/aos/agrovoc/c_13344; Http://aims.fao.org/aos/agrovoc/c_5083; Http://aims.fao.org/aos/agrovoc/c_32413.
Ano: 1996
URL: http://hdl.handle.net/1834/2968

Productividad planctónica y condiciones oceanográficas locales en Isla Gorgona durante julio 2006
Provedor de dados: 20
Autores: Valencia, B.; Giraldo, A.; Ramírez, D. G.
La isla Grogona es la mayor área insular en el Pacífico colombiano. Esta isla, localizada a 30 Km del continente, alberga una alta diversidad biológica y ecosistémica entre la que se incluye el arrecife coralino más desarrollado del Pacífico Oriental Tropical. A pesar de la alta relevancia de esta localidad en la política nacional ambiental, un escaso esfuerzo de investigación ha sido focalizado hacia la descripción del ambiente pelágico, el cual sustenta las particularidades ecosistémicas de isla Gorgona. En este trabajo se describen las condiciones de temperatura, transparencia, trubidez, salinidad, oxígeno disuelto, nutrientes nitrogenados (nitratos) y productividad plantónica (clorofila-a y biomasa zooplanctónica) local en el ambiente pelágico del...
Tipo: Journal Contribution
Palavras-chave: Oceanography; Phytoplankton; Zooplankton.
Ano: 2011
URL: http://hdl.handle.net/1834/4414

Relación fitoplancton-zooplancton en el Pacífico Ecuatorial (Ecuador), durante septiembre 2001
Provedor de dados: 20
Autores: Salazar, E.; Mero, M.; Torres, G.; Calderón, T.; Franco, V.
El presente trabajo es una contribución al conocimiento de la bio-oceanografía del mar ecuatoriano, forma parte del Proyecto de Monitoreo de las condiciones oceanográficas en el mar ecuatoriano y su relación con eventos de El Niño, realizadas en el B/I ORION del Instituto Oceanográfico de la Armada (INOCAR) en septiembre-octubre 2001, como un aporte a la comunidad.
Tipo: Journal Contribution
Palavras-chave: Phytoplankton; Zooplankton; Biogeography; Abundance; Equatorial upwelling; El Nino phenomena; Distribution; Chlorophylls; Phytoplankton; Zooplankton; Distribution; Biogeography; Chlorophylls.
Ano: 2003
URL: http://hdl.handle.net/1834/2340

Variation in the physico-chemical features and phytoplankton of new Calabar river at Aluu, Rivers State, Nigeria.
Provedor de dados: 20
Autores: Erondu, E.S.; Chindah, A.C.
The physico-chemical features and phytoplankton community of the upper reaches of the New Calabar river at Aluu were studied at high and low water slacks for a period of 12 months. The water was acidic (pH 5.5 – 6.5) with low alkalinity (10 – 20mg CaCO3 L-1 and characteristically soft (total hardness ranging from 10 to 60mg CaCO3L-1).  There was obvious seasonal flux in the silica level, with dry season having higher values than wet season. The phytoplankton was predominated by the diatoms, which constituted more than 85% of the total phytoplankton population. The predominant taxa were Melosira sp. Tabellaria spp. Surirella spp. and Navicula spp. The phytoplankton density was significantly higher during the dry season than rainy season (Czekanowski’s...
Tipo: Report
Palavras-chave: Physicochemical properties; Phytoplankton; Phytoplankton; Physicochemical properties; Http://aims.fao.org/aos/agrovoc/c_13344; Http://aims.fao.org/aos/agrovoc/c_13330.
Ano: 1991
URL: http://hdl.handle.net/1834/2441

The effect of water Hyacinth, Eichhornia Crassipes, infestation on phytoplankton productivity in Lake Naivasha and the status of control
Provedor de dados: 20
Autores: Mironga, John Momanyi.
The paper presents data collected in an assessment of effects of water hyacinth infestation on phytoplankton productivity in Lake Naivasha, Kenya. A summary of the status of control and strategies for the future is given. The ecological effects of water hyacinth, Eichhornia Crassipes, on Lake Naivasha have received little attention compared to the large body of work available on the weed’s socioeconomic impact on the country’s water ways and methods for its removal. This study was conducted to determine if water hyacinth infestation in Lake Naivasha affects phytoplankton productivity. Several sampling stations were set up in the lake at sites where the floating mats of the weed were present and sites where the weed was absent. Phytoplankton chlorophyll-a...
Tipo: Proceedings Paper
Palavras-chave: Aquatic plants; Freshwater weeds; Infestation; Primary production; Ecological crisis; Environmental effects; Check lists; Species diversity; Phytoplankton; Socioeconomic aspects; Biodiversity; Community composition; Primary production; Aquatic plants; Species diversity; Water hyacinth; Http://aims.fao.org/aos/agrovoc/c_34329; Http://aims.fao.org/aos/agrovoc/c_559; Http://aims.fao.org/aos/agrovoc/c_33954; Http://aims.fao.org/aos/agrovoc/c_15267.
Ano: 2006
URL: http://hdl.handle.net/1834/1497

Tasa de producción de fecas y coprofagía en Eucalanus subtenuis (Copepoda, Calanoidea), bajo condiciones controladas de laboratorio
Provedor de dados: 20
Autores: Ramírez, J.G.; Franco-Herrera, A.; Rincón, D.; Castro, L.
Twelve laboratory experiments to evaluate the egestion in short time periods at the herbivorous copepod Eucalanus subtenuis, were carried out with the aim to obtain data about the morphometry, volume, faeces production rate and coprophagy index, as well as to detect some feeding strategy. Two feeding treatments with different phytoplankton size classes (measured as chlorophyll a concentration) were applied to the copepod: 0 -25 µm (pico and nanophytoplankton) and 25-85 µm (microphytoplankton). The food source was obtained from the surface water in the Caribbean central coast region, between February and May 2001. At copepods with mean total size of 1855.45 +/- 20.50 µm, faeces length fluctuated between 66.66 and 315 µm, being longer when copepods fed with...
Tipo: Journal Contribution
Palavras-chave: Phytoplankton; Upwelling; Marine crustaceans; Phytoplankton; Http://aims.fao.org/aos/agrovoc/c_13344.
Ano: 2005
URL: http://hdl.handle.net/1834/2017

Spatial variation of phytoplankton and some physico-chemical variables during the highest flood season in Lake Nasser (Egypt)
Provedor de dados: 20
Autores: Abdel-Halim, A.M.; Gharib, S.M.
Species composition, abundance, and phytoplankton biomass in Lake Nasser were studied during the highest flood season in autumn 1999, and were supported by some physico-chemical environmental parameters. The nutrient salts levels were low to medium, with ranges of 0.96-9.92 g/L for nitrite, 20.14-72.14 g/L for ammonia, complete depletion -27.69 g/L for phosphate, and 5.83-9.00 g/L for silicate. A total of 71 taxa were identified, of which 46% were chlorophytes, 26% bacillariophytes and 22% cyanophytes. Phytoplankton abundance and biomass values were higher in the northern stations than in the southern, but were lower than previously reported, indicating approaching from oligomesotrophic status, with,respectively, means of 108.9 x 104 unit/L and 1.18...
Tipo: Journal Contribution
Palavras-chave: Environmental Studies; Phytoplankton; Phytoplankton; Http://aims.fao.org/aos/agrovoc/c_13344.
Ano: 2006
URL: http://hdl.handle.net/1834/1454

Listado de diatomeas (Bacillariophyta) registradas para el Mar Caribe colombiano
Provedor de dados: 20
Autores: Lozano-Duque, Yesid; Vidal-V., Luis A.; Navas-S., Gabriel R.
Se realizó una revisión bibliográfica de la información disponible sobre las especies registradas de diatomeas (Bacillariophyta) para las zonas costera y oceánica del mar Caribe colombiano. Se presenta el listado de 337 taxones correspondientes a 312 especies, 19 variedades y siete formas, agrupadas en 54 familias y 106 géneros. La clasificación taxonómica se basó en el sistema propuesto por Round et al. (1990).
Tipo: Journal Contribution
Palavras-chave: Phytoplankton; Plankton; Plankton; Phytoplankton; Http://aims.fao.org/aos/agrovoc/c_5950; Http://aims.fao.org/aos/agrovoc/c_13344.
Ano: 2010
URL: http://hdl.handle.net/1834/3741

Composición, distribución y abundancia del plancton en el estuario de San Lorenzo, Esmeraldas - Ecuador
Provedor de dados: 20
Autores: Naranjo, Ch.; Tapia, M.E.
El presente trabajo es una contribución al estudio del plancton estuarino presente en el área comprendida del Canal de San Lorenzo, provincia de Esmeraldas, para lo cual existe poca información sobre este tema.
Tipo: Journal Contribution
Palavras-chave: Distribution; Composition; Abundance; Plankton; Phytoplankton; Zooplankton; Ichthyoplankton; Diatoms; Biomass; Distribution; Plankton; Phytoplankton; Zooplankton; Biomass; Diatoms; Http://aims.fao.org/aos/agrovoc/c_35773; Http://aims.fao.org/aos/agrovoc/c_5950; Http://aims.fao.org/aos/agrovoc/c_13344; Http://aims.fao.org/aos/agrovoc/c_15490; Http://aims.fao.org/aos/agrovoc/c_926; Http://aims.fao.org/aos/agrovoc/c_32657.
Ano: 2002
URL: http://hdl.handle.net/1834/2277

Some factors affecting the primary production of phytoplankton in Lake Burullus
Provedor de dados: 20
Autores: Radwan, A.M.
This study which was carried out at the different stations and sectors of Lake Burullus during the period from January till December 2000 showed that the identified species of phytoplankton community in Lake Burullus during the period of study included the classes of Bacillariophyceae, Cyanophyceae, Chlorophyceae, Euglenophyceae and Dinophyceae. The total number of species recorded during this period was 65 species. The standing crop and primary production of phytoplankton showed pronounced variations at different stations and months correlated with physicochemical conditions of water especially phosphate , nitrate and silicate contents. Stations 6,10 and 15 were the most productive in the eastern sector ,the middle sector, and the western sector...
Tipo: Journal Contribution
Palavras-chave: Primary production; Phytoplankton; Physico-chemicalconditions Phytoplankton Phytoplankton http://aims.fao.org/aos/agrovoc/c_13344.
Ano: 2005
URL: http://hdl.handle.net/1834/1306

La comunidad fitoplanctónica durante eventos de surgencia y no surgencia, en la zona costera del Departamento del Magdalena, Caribe colombiano
Provedor de dados: 20
Autores: Ramírez-Barón, J.S.; Franco-Herrera, A.; García-Hoyos, L.M.; López, D.A.
Se evaluaron algunos atributos estructurales de la comunidad fitoplanctónica en las ensenadas de Granate y Gaira y bahía de Taganga, con el fin de establecer su respuesta a cambios en la dinámica oceanográfica, modulada por pulsos de surgencia y no surgencia en la zona costera del departamento del Magdalena, Caribe colombiano, en el período comprendido entre febrero-junio de 2008, correspondiente a época seca mayor y lluviosa menor. La velocidad del viento indicó la división de dos períodos  febrero- abril (en presencia de surgencia: S) y junio-julio (no surgencia: NS) de 2008. Para cada período (S-NS), se identificaron en total 51-47 géneros distribuidos en 29-28 familias, correspondiendo el 78.23-86.19 % a diatomeas céntricas, el 16.68-9.47 % a diatomeas...
Tipo: Journal Contribution
Palavras-chave: Phytoplankton; Upwelling; Chlorophylls; Phytoplankton; Chlorophylls; Http://aims.fao.org/aos/agrovoc/c_13344; Http://aims.fao.org/aos/agrovoc/c_1577.
Ano: 2010
URL: http://hdl.handle.net/1834/4018

Efectos de la radiación solar sobre el fitoplancton de aguas antárticas y subantárticas
Provedor de dados: 20
Autores: Hernando, M.P.
The increments in the ultraviolet radiation B (RUVB, 280-320 nm) resultants of the destruction of the ozone layer affect diverse echo-physiologic aspects of the marine phytoplankton. On this study were compared the responses of phytoplankton from an ambient Sub-Antarctic (Channel Beagle, 54º 52´S, 68º 18´W) and another Antarctic (Potter Cove, 62º 14´S, 58º 38´W) to the ultraviolet radiation (RUV). The decrease of the photosynthesis on short term (hours) was observed in both places, however inhibition thresholds were present. In the Beagle Channel, these were for RUVB and ultraviolet radiation A (RUVA, 320-400 nm), respectively, 0,2 and 6,2 Wm-2 for communities with more than 70% diatoms and 0,45 and 14,2 Wm-2, respectively, for communities with more than...
Tipo: Theses and Dissertations
Palavras-chave: Phytoplankton; Photosynthesis; Ultraviolet radiation; Vertical mixing; Taxonomy; Phytoplankton; Taxonomy; Photosynthesis; Ultraviolet radiation; Http://aims.fao.org/aos/agrovoc/c_13344; Http://aims.fao.org/aos/agrovoc/c_7631; Http://aims.fao.org/aos/agrovoc/c_5812; Http://aims.fao.org/aos/agrovoc/c_8046.
Ano: 2008
URL: http://hdl.handle.net/1834/2868

Lista de especies de dinoflagelados (Dinophyta) registrados en el mar Caribe colombiano
Provedor de dados: 20
Autores: Lozano Duque, Y.; Alfonso Vidal, L.; Navas S., G. R.
Se presenta un listado de especies de dinoflagelados marinos registrados en la zona costera y oceánica del mar Caribe colombiano. Este listado se basa en la revisión de información disponible de estudios sobre la comunidad fitoplanctónica. Se registran un total de 186 taxones correspondientes a 169 especies con 27 variedades y seis formas. Estos se agrupan en 32 géneros, 17 familias, seis órdenes y dos clases. La clasificación taxonómica se basó en el sistema propuesto por Fensome et al. (1993)
Tipo: Journal Contribution
Palavras-chave: Phytoplankton; Dinoflagellates; Dinophyta.
Ano: 2011
URL: http://hdl.handle.net/1834/4395

Composición y variación estacional del fitoplancton, zooplancton y microbentos en el estuario interior del Golfo de Guayaquil, durante el año 2003
Provedor de dados: 20
Autores: Gualancañay, E.; Tapia, M.E.; Naranjo, Ch.
El presente trabajo comprende el estudio de la distribution cualitativa y cuantitativa del fitoplancton en el Golfo de Guayaquil, durante dos épocas: Húmeda y seca. El propósito del presente trabajo con respecto al zooplankton está orientado a conocer los cambios en la composición, abundancia y diversidad del zooplancton y en particular el Phyllum Chaetognatha con el objetivo de relacionar la distribución de las especies de Quetognatos con los parámetros físicos. En lo relacionado al estudio del microbentos, se pretende estudiar la composición específica y la abundancia relativa de las especies de la microflora béntica y de la microfauna bentónica y su relación con factores ambientales.
Tipo: Journal Contribution
Palavras-chave: Community composition; Seasonal variations; Phytoplankton; Diatoms; Biomass; Zooplankton; Microorganisms; Benthos; Geographical distribution; Estuaries; Phytoplankton; Biomass; Zooplankton; Benthos; Geographical distribution; Estuaries; Diatoms; Microorganisms; Http://aims.fao.org/aos/agrovoc/c_13344; Http://aims.fao.org/aos/agrovoc/c_926; Http://aims.fao.org/aos/agrovoc/c_15490; Http://aims.fao.org/aos/agrovoc/c_878; Http://aims.fao.org/aos/agrovoc/c_5083; Http://aims.fao.org/aos/agrovoc/c_2673; Http://aims.fao.org/aos/agrovoc/c_32657; Http://aims.fao.org/aos/agrovoc/c_4807.
Ano: 2004
URL: http://hdl.handle.net/1834/2283

Distribución latitudinal del fitoplancton entre Islas Cocos - Galápagos, Noviembre-Diciembre 2001
Provedor de dados: 20
Autores: Torres, G.
El propósito de esta investigación fue realizar una evaluación de la distribución de las especies del fitoplancton (red 55u), durante noviembre-diciembre-2001, en una región latitudinal que implica dos áreas insulares del Pacífico Tropical Islas Cocos e Islas Galápagos, estudios que serán de gran contribución científica para el conocimiento de estas especies en la región del mar ecuatoriano.
Tipo: Journal Contribution
Palavras-chave: Geographical distribution; Phytoplankton; Biomass; Species diversity; Cruises; Oceanic islands; Geographical distribution; Phytoplankton; Biomass; Species diversity; Http://aims.fao.org/aos/agrovoc/c_5083; Http://aims.fao.org/aos/agrovoc/c_13344; Http://aims.fao.org/aos/agrovoc/c_926; Http://aims.fao.org/aos/agrovoc/c_33954.
Ano: 2002
URL: http://hdl.handle.net/1834/2276

Dinámica del plancton de la Ciénaga Grande de Santa Marta, Caribe colombiano
Provedor de dados: 20
Autores: De La Hoz-Aristizabal, M.V.
In order to assess phytoplankton dynamics in the Ciénaga Grande de Santa Marta, bimonthly sampling was done at six stations from March 1996 to February 1997. Salinity showed wide ranges so the year could be divided in four seasons. Higher salinities were related to higher phytoplankton density, while lower salinities were related to lower phytoplankton densities and increased species richness. 224 taxa were recorded, and the general trend was towards a low diversity with a few dominant species, and most of them rare. Cyanophytes showed the highest abundances all year. Salinity, turbidity and orthophosphates were the environmental factors best related to the biotic data. Seasonal changes in phytoplankton concerning to meteorological conditions, fresh and...
Tipo: Journal Contribution
Palavras-chave: Phytoplankton; Dominant species; Rare species; Phytoplankton; Dominant species; Http://aims.fao.org/aos/agrovoc/c_13344; Http://aims.fao.org/aos/agrovoc/c_2362.
Ano: 2004
URL: http://hdl.handle.net/1834/3055

Variación estacional del fitoplancton en una estación fija en el estero del Muerto durante 1999-2000-2001
Provedor de dados: 20
Autores: Tapia, M.E.
El objetivo del presente estudio es conocer la variación estacional de las especies del fitoplancton y su relación con las condiciones ambientales durante el período en estudio.
Tipo: Journal Contribution
Palavras-chave: Seasonal variations; Phytoplankton; Chlorophylls; Diatoms; Environmental conditions; Cell counters; Estuaries; Fixed stations; Marshes; Biomass; Phytoplankton; Estuaries; Biomass; Chlorophylls; Diatoms; Environmental conditions; Marshes; Http://aims.fao.org/aos/agrovoc/c_13344; Http://aims.fao.org/aos/agrovoc/c_2673; Http://aims.fao.org/aos/agrovoc/c_926; Http://aims.fao.org/aos/agrovoc/c_1577; Http://aims.fao.org/aos/agrovoc/c_32657; Http://aims.fao.org/aos/agrovoc/c_32980; Http://aims.fao.org/aos/agrovoc/c_4631.
Ano: 2006
URL: http://hdl.handle.net/1834/2310

Estudio de la comunidad fitoplanctónica en el estuario interior de Esmeraldas, Ecuador durante mayo de 2002
Provedor de dados: 20
Autores: Tapia, M.E.
El presente trabajo tiene por finalidad determinar la composición, abundancia y distribution de las especies que se encuentran en los ríos de la ciudad de Esmeraldas.
Tipo: Journal Contribution
Palavras-chave: Chlorophylls; Phytoplankton; Abundance; Diatoms; Species diversity; Cell counters; Estuaries; Community composition; Distribution; Phytoplankton; Estuaries; Distribution; Chlorophylls; Diatoms; Species diversity; Http://aims.fao.org/aos/agrovoc/c_13344; Http://aims.fao.org/aos/agrovoc/c_2673; Http://aims.fao.org/aos/agrovoc/c_35773; Http://aims.fao.org/aos/agrovoc/c_1577; Http://aims.fao.org/aos/agrovoc/c_32657; Http://aims.fao.org/aos/agrovoc/c_33954.
Ano: 2003
URL: http://hdl.handle.net/1834/2402

Procesos planctónicos en el Golfo de Guayaquil (Campo Amistad) julio-agosto/2001
Provedor de dados: 20
Autores: Torres Ch., G.; Calderón, T.; Mero, M.; Franco, V.
El presente trabajo es una contribución al estudio del fitoplancton y zooplancton marino-estuarino y su relación con las condiciones ambientales físico-químicas presentes en el entorno de la plataforma Amistad de producción de gas (Campo Amistad - Golfo de Guayaquil Externo), realizada por el Instituto Oceanográfico de la Armada en el B/I ORION durante julio-agosto del 2001.
Tipo: Journal Contribution
Palavras-chave: Biomass; Chlorophylls; Nutrients (mineral); Zooplankton; Phytoplankton; Environmental assessment; Production platforms; Biomass; Zooplankton; Phytoplankton; Chlorophylls; Environmental assessment; Http://aims.fao.org/aos/agrovoc/c_926; Http://aims.fao.org/aos/agrovoc/c_15490; Http://aims.fao.org/aos/agrovoc/c_13344; Http://aims.fao.org/aos/agrovoc/c_1577; Http://aims.fao.org/aos/agrovoc/c_37751.
Ano: 2004
URL: http://hdl.handle.net/1834/2285

Florecimiento de microalgas relacionado con mortandad masiva de peces en el complejo lagunar Ciénaga Grande de Santa Marta, Caribe colombiano
Provedor de dados: 20
Autores: Mancera-P., José E.; Vidal-V., Luis A.
Entre los meses de julio y agosto de 1994 un fenómeno discontinuo de muerte masiva de peces se registró en aguas del complejo lagunar de la Ciénaga Grande de Santa Marta, Colombia. El primer evento se presentó del 15 al 19 de julio, el segundo alrededor del día 20 de agosto y el tercero entre el 26 y 31 del mismo mes. La presencia en altas concentraciones de la cianofita filamentosa Cf. Anabaenopsis sp., registrada en la literatura como altamente tóxica, podría estar relacionada con las causas del primer evento. Un incremento en las concentraciones de fósforo, y un posterior florecimiento de nano y picoplancton, especialmente cianofíceas y algas flageladas, explicaría en parte las condiciones hipóxicas y anóxicas observadas en el tercer evento, las cuales...
Tipo: Journal Contribution
Palavras-chave: Ecology; Phytoplankton; Chemical analysis; Environmental impact; Coastal lagoons; Estuaries; Ecology; Phytoplankton; Environmental impact; Estuaries; Coastal lagoons; Http://aims.fao.org/aos/agrovoc/c_2467; Http://aims.fao.org/aos/agrovoc/c_13344; Http://aims.fao.org/aos/agrovoc/c_24420; Http://aims.fao.org/aos/agrovoc/c_2673; Http://aims.fao.org/aos/agrovoc/c_1697.
Ano: 1994
URL: http://hdl.handle.net/1834/3787

Distribución de la densidad fitoplanctónica en una estación fija costera. La Libertad (Ecuador), durante 1989-1993
Provedor de dados: 20
Autores: Torres, G.
El presente trabajo pretende dar a conocer los resultados de la distribución estacional cuantitativa del fitoplancton (diatomeas y dinoflagelados), y su relación con masas de agua, dadas por temperatura y salinidad, desde 1989 hasta 1993 en una estación fija costera La Libertad, período en el cual se presentó un evento "El Niño" 1991-1992.
Tipo: Journal Contribution
Palavras-chave: Phytoplankton; Seasonal distribution; Water temperature; Oceanographic stations; Fixed stations; Biomass; Population density; Biomass; Phytoplankton; Water temperature; Population density; Http://aims.fao.org/aos/agrovoc/c_926; Http://aims.fao.org/aos/agrovoc/c_13344; Http://aims.fao.org/aos/agrovoc/c_16063; Http://aims.fao.org/aos/agrovoc/c_6112.
Ano: 1996
URL: http://hdl.handle.net/1834/2198

Phytoplankton composition in coastal lagoons of different trophic status in Northern Colombia determined by microscope and HPLC-Pigment analysis
Provedor de dados: 20
Autores: Gocke, K.; Meyerhöfer, M.; Mancera P., J.E.; Vidal, L.A.
The regional differences in the composition of the phytoplankton assemblages in several coastal lagoons of the “Outer Delta of the Río Magdalena” (Caribbean coast of Colombia) were determined using microscopic counting and HPLC-pigment measurements. The study sites can be classified as 1) a group of limnic lagoons with relatively low (5.5-19 µg/l) chlorophyll a (chl a) concentrations and high inorganic suspension loading, 2) a group of brackish lagoons with high (62-90 µg/l) chl a concentrations and high amounts of organic seston, (two further lagoons form a transition between group 1 and 2, and 3) a fully marine Caribbean bay with very low (0.3 µg/l) chl a and seston concentrations. The regional variations in salinity of the lagoons are due to inflow of...
Tipo: Journal Contribution
Palavras-chave: Phytoplankton; Pigments; Coastal lagoons; Phytoplankton; Pigments; Coastal lagoons; Http://aims.fao.org/aos/agrovoc/c_13344; Http://aims.fao.org/aos/agrovoc/c_5875; Http://aims.fao.org/aos/agrovoc/c_1697.
Ano: 2003
URL: http://hdl.handle.net/1834/3200

Dinámica océano-atmosfera y su influencia en la biomasa fitoplanctónica, en la zona costera del Departamento del Magdalena, Caribe colombiano
Provedor de dados: 20
Autores: Franco-Herrera, A.; García-Hoyos, L.M.; Ramírez-Barón, J.S.; López-Cerón, D.L.
Durante los meses de febrero a junio de 2008, en las aguas costeras del departamento del  Magdalena, específicamente en las ensenadas de Gaira y Granate y en la bahía de Taganga, se realizaron seis muestreos que correspondieron a las épocas climáticas seca mayor y lluviosa menor, con el fin de detemrinar la influencia del acoplamiento océano-atmósfera sobre la intensidad de los eventos de surgencia, considerando la variabilidad fisicoquímica en la columna del agua comprendida entre los 0 y 60 mde profundidad y la respuestad e la comunidad fitoplanctónica medida en términos de clorofila a. Se evaluaron variables atomosféricas, oceanográficas y biológicas siguiendo el método Euleriano. De acuerdo a las condiciones océano-atmosféricas durante el período de...
Tipo: Journal Contribution
Palavras-chave: Upwelling; Trade winds; Nutrients (mineral); Chlorophylls; Phytoplankton; Chlorophylls; Http://aims.fao.org/aos/agrovoc/c_1577.
Ano: 2010
URL: http://hdl.handle.net/1834/4020

Caracterización biológica de la bahía de Jaramijó en la costa Ecuatoriana
Provedor de dados: 20
Autores: Gualancañay, E.; Tapia, M.E.; Naranjo, Ch.; Cruz, M.; Villamar, F.
Para el estudio biológico y ambiental de la bahía de Jaramijó en los componentes fitoplancton, zooplancton, microbentos y macrobentos, se analizaron 15 estaciones provenientes de tres niveles entre 10 y 20 metros de profundidad y dividido en tres perfiles paralelos a la costa, durante las estaciones seca y lluviosa del año 2008. El fitoplancton y zooplancton resultaron muy abundantes durante la estaciòn lluviosa y menos abundante en la estación seca del año 2008. Predominaron las especies de diatomeas: Bacteriastrum hyalinum, Leptocylindrus danicus, Rhizósolenia stolterfothii, Chaetoceros affinis y Ch. curvisetus y la presencia de dinoflagelados y cianobacterias fue escasa dinoflagelados. En general las especies halladas son típicas de una mezcla de masas...
Tipo: Journal Contribution
Palavras-chave: Phytoplankton; Zooplankton; Biogeography; Biomass; Marine molluscs.
Ano: 2010
URL: http://hdl.handle.net/1834/4212

Distribución de clorofila "a" y feopigmentos en el Estrecho Bransfield, Bahía Chile y Paso Drake durante el verano de 1998 (Antártica)
Provedor de dados: 20
Autores: Torres Ch., G.
Se estima la productividad primaria en concentración de clorofila "a" y feopigmentos, como indicativo de la calidad del primer nivel trófico-fitoplancton, registradas en el Estrecho Bransfield, Bahía Chile (Noreste de la Isla Greenwich) y en el Pacífico Drake, durante la VII Expedición Ecuatoriana a la Antártida a bordo del B/I ORION durante el verano austral de 1998. La biomasa fitoplanctónica superficial de clorofila "a" en el Estrecho Bransfield, registró las mayores concentraciones (0.7-08 mg/m3) hacia el noreste del estrecho, y las menores concentraciones de 0.2 mg/m3 se localizaron hacia el centro. A nivel subsuperficial de los 20 m se registraron las más altas concentraciones de toda la columna de agua (0-100 m), con una distribución latitudinal...
Tipo: Journal Contribution
Palavras-chave: Chlorophylls; Biomass; Phytoplankton; Biological production; Pigments; Polar zones; Biomass; Phytoplankton; Biological production; Pigments; Chlorophylls; Http://aims.fao.org/aos/agrovoc/c_926; Http://aims.fao.org/aos/agrovoc/c_13344; Http://aims.fao.org/aos/agrovoc/c_36649; Http://aims.fao.org/aos/agrovoc/c_5875; Http://aims.fao.org/aos/agrovoc/c_1577.
Ano: 1998
URL: http://hdl.handle.net/1834/3840

Comunidades del plancton en la Caleta Aeolian de la Isla Baltra - Galápagos (Ecuador), durante 2005
Provedor de dados: 20
Autores: Naranjo, Ch.; Tapia, M.E.
El propósito del trabajo es determinar la composición, abundancia de los grupos dominantes del fitoplancton y zooplancton, establecer las especies de Quetognatos y su relación con la temperatura superficial del mar durante marzo de 2005 correspondiente a la época húmeda.
Tipo: Journal Contribution
Palavras-chave: Plankton; Primary production; Biological production; Phytoplankton; Zooplankton; Biomass; Abundance; Community composition; Fish eggs; Surface temperature; Plankton; Primary production; Biological production; Phytoplankton; Zooplankton; Biomass; Http://aims.fao.org/aos/agrovoc/c_5950; Http://aims.fao.org/aos/agrovoc/c_34329; Http://aims.fao.org/aos/agrovoc/c_36649; Http://aims.fao.org/aos/agrovoc/c_13344; Http://aims.fao.org/aos/agrovoc/c_15490; Http://aims.fao.org/aos/agrovoc/c_926.
Ano: 2007
URL: http://hdl.handle.net/1834/2346

Application of an Ocean Color Algal Taxa Detection Model to Red Tides in the Southern Benguela
Provedor de dados: 20
Autores: Etheridge, S.M.; Roesler, C.S.; Pitcher, G.C.
A forward reflectance model is used to demonstrate the sensitivity of hyperspectral ocean color observations to phytoplankton biomass, species composition and cell size. An inverse ocean color model is developed which has explicit terms for 5 taxonomic groups of phytoplankton. The model expresses the contributions of each group in terms of the magnitude of the absorption coefficient, which is proportional to biomass. The model is applied to a time series of reflectance data from an expansive red tide off the west coast of South Africa. The results compare favorably with those derived from microscopic cell counts. This demonstrates the utility of in situ ocean color detection of the composition and concentration of potentially harmful algae.
Tipo: Report
Palavras-chave: Algae; Plankton studies; Phytoplankton; Colorimetric techniques.
Ano: 2000
URL: http://hdl.handle.net/1834/826

Fitoplancton en el afloramiento de las Islas Galápagos, durante Agosto 2000
Provedor de dados: 20
Autores: Torres, G.; Tapia, M.E.
Esta investigación es parte del Proyecto Indicadores Biológicos de diferentes ecosistemas marinos del Ecuador, correspondiente a la región Insular de Galápagos durante agosto 2000, con el propósito de comprender la dinámica poblacional del fitoplancton (cuali-cuantitativo) de las diferentes masas de agua que afloran al este y oeste de Galápagos y entre las islas enfocando áreas de mayor fertilidad marina en la época seca.
Tipo: Journal Contribution
Palavras-chave: Phytoplankton; Chlorophylls; Biomass; Upwelling; Marine ecology; Water masses; Population dynamics; Cruises; Oceanic islands; Phytoplankton; Biomass; Chlorophylls; Marine ecology; Population dynamics; Http://aims.fao.org/aos/agrovoc/c_13344; Http://aims.fao.org/aos/agrovoc/c_926; Http://aims.fao.org/aos/agrovoc/c_1577; Http://aims.fao.org/aos/agrovoc/c_4609; Http://aims.fao.org/aos/agrovoc/c_6111.
Ano: 2002
URL: http://hdl.handle.net/1834/2296

Caractérisation hivernale de la lagune de Bizerte
Provedor de dados: 20
Autores: Bejaoui, B.; Ben Charada, R.; Moussa, M.; Ben Hamadou, R.; Harzallah, A.; Chapelle, A.
Ce travail porte sur la caractérisation hivernale de la lagune de Bizerte en se basant sur une campagne de mesures effectuée en janvier 2004. Cette campagne a porté sur 17 stations réparties sur toute la lagune ainsi qu’une station marine de référence. Chaque échantillon a fait l’objet de mesures in-situ (Température, Salinité, Conductivité, Transparence, Acidité et Oxygène dissous) et des analyses au laboratoire (NO3, NO2, NT, PO4, Chlorophylle-a, Phéopigment et MES). Cette étude a montré que la distribution spatiale des paramètres est fortement liée aux apports fluviaux. Contrairement au phosphore minéral, la teneur en azote total montre une variation spatiale importante. L’analyse de la distribution spatiale des nutriments d’une part et de la...
Tipo: Journal Contribution
Palavras-chave: Geographical distribution; Hydrobiology; Nitrogen; Nutrients (mineral); Phosphorus; Phytoplankton; Geographical distribution; Nitrogen; Phosphorus; Phytoplankton; Hydrobiology; Http://aims.fao.org/aos/agrovoc/c_5083; Http://aims.fao.org/aos/agrovoc/c_5192; Http://aims.fao.org/aos/agrovoc/c_5804; Http://aims.fao.org/aos/agrovoc/c_13344; Http://aims.fao.org/aos/agrovoc/c_3718.
Ano: 2005
URL: http://hdl.handle.net/1834/3748

Variations des teneurs en chlorophylle &lt;a&gt; et en sels nutritifs dans la lagune de l'Ichkeul
Provedor de dados: 20
Autores: Chaouachi, B.; Ben Hassine, O. K.; Lemoalle, J.
Le suivi régulier des teneurs en chlorophylle a et en sels nutritifs dans la lagune de l'Ichkeul durant l’année 1993 a permis de mieux comprendre le fonctionnement de cet écosystème, milieu original et complexe. Les cycles annuels de la chlorophylle et des sels nutritifs montrent des fluctuations importantes, à l'échelle hebdomadaire. Les fortes biomasses phytoplanctoniques sont observées en hiver en période de courant sortant, en opposition avec les concentrations de phosphore réactif dissous qui ne sont notables que dans l’oued Tinja par courant entrant. Les nitrates et nitrites sont en concentrations plus irrégulières, sans saisonnalité marquée. La gamme des concentrations mesurées en 1993 a été comparable à celle observée lors des années précédentes.
Tipo: Journal Contribution
Palavras-chave: Nitrites; Chlorophylls; Ecosystems; Nitrates; Phosphates; Phytoplankton; Nitrites; Ecosystems; Nitrates; Phytoplankton; Chlorophylls; Phosphates; Http://aims.fao.org/aos/agrovoc/c_5190; Http://aims.fao.org/aos/agrovoc/c_2482; Http://aims.fao.org/aos/agrovoc/c_5187; Http://aims.fao.org/aos/agrovoc/c_13344; Http://aims.fao.org/aos/agrovoc/c_1577; Http://aims.fao.org/aos/agrovoc/c_35986.
Ano: 2001
URL: http://hdl.handle.net/1834/3701

Modèle couple dynamique -écologie pour la lagune de Bizerte
Provedor de dados: 20
Autores: Bejaoui, B.; Harzallah, A.; Moussa, M.; Chapelle, A.
This work concerns the development of a three dimensional hydroecological model based on two nutrient elements, nitrogen and phosphorus.The hydrodynamic model is 3D forced by monthly climatic data of NOAA. The ecological model was developed based on two nutrient elements, nitrogen and phosphorus in interaction with the phytoplankton and zooplancton. The ecological model is made up with two compartments, the water column and the sediment layer. Eight state variables are used to characterize the water column and six state variables for the sediment layer. As a first application, the model was tested on the Bizerte Lagoon. A comparison between simulations and observations showed that the model can reproduce with satisfactory way the observations carried out...
Tipo: Journal Contribution
Palavras-chave: Dissolved oxygen; Hydrodynamics; Models; Nutrient cycles; Phytoplankton; Zooplankton.
Ano: 2008
URL: http://hdl.handle.net/1834/4264

Distribución del fitoplancton en la región costera del mar ecuatoriano, durante diciembre 2000
Provedor de dados: 20
Autores: Torres, G.; Tapia, M.E.
La presente investigación describe el comportamiento del primer nivel trófico (clorofila, feopigmentos, biomasa celular e indicadores del fitoplancton) en el ecosistema costero del mar ecuatoriano, conocer la incidencia de las principales especies que se encuentran formando núcleos de mayor productividad e inter-relacionadas con las condiciones ambientales durante el Crucero realizado en diciembre/2000.
Tipo: Journal Contribution
Palavras-chave: Distribution; Phytoplankton; Chlorophylls; Biomass; Indicator species; Cruises; Distribution; Phytoplankton; Biomass; Chlorophylls; Indicator species; Http://aims.fao.org/aos/agrovoc/c_35773; Http://aims.fao.org/aos/agrovoc/c_13344; Http://aims.fao.org/aos/agrovoc/c_926; Http://aims.fao.org/aos/agrovoc/c_1577; Http://aims.fao.org/aos/agrovoc/c_35790.
Ano: 2002
URL: http://hdl.handle.net/1834/2260

Catálogo de organismos fitoplanctónicos identificados en el Río Guayas
Provedor de dados: 20
Autores: Guzmán, R.
The samples for the identification of phytoplankton were taken in the Guayas river during the monyhs of January, February, March, July, september, October and December of 1987, and from the month of January to the month of December of 1988. The investigation was carried out on 152 samples, in wich, 102 species were identified following the sistematic and taxonomic work of several authors.
Tipo: Journal Contribution
Palavras-chave: Species diversity; Catalogues; Phytoplankton; Phytoplankton; Species diversity; Http://aims.fao.org/aos/agrovoc/c_13344; Http://aims.fao.org/aos/agrovoc/c_33954.
Ano: 1993
URL: http://hdl.handle.net/1834/3068

Caracterização e distribuição do fitoplâncton na zona norte da costa angolana em Agosto de 2002
Provedor de dados: 20
Autores: Paulo André de Sousa Coelho.
Instittuto  Nacional de Investigaçao  Pesqueira, INIP, luanda , Angola
Tipo: Theses and Dissertations
Palavras-chave: Phytoplankton; Nanoplankton; Biology; Limnology; Algae.
Ano: 2007
URL: http://hdl.handle.net/1834/5345

Relación fitoplancton-zooplancton en el Pacífico Ecuatorial (Ecuador), durante septiembre 2001
Provedor de dados: 20
Autores: Torres, G.; Mero, M.; Calderón, T.; Franco, V.; Salazar, E.
El presente trabajo es una contribución al conocimiento de la bio-oceanografía del mar ecuatoriano, forma parte del proyecto de Monitoreo de las condiciones oceanográficas en el mar ecuatoriano y su relación con eventos de El Niño, realizadas en el B/I ORION del Instituto Oceanográfico de la Armada (INOCAR) en septiembre-octubre 2001, como un aporte a la comunidad científica.
Tipo: Journal Contribution
Palavras-chave: Phytoplankton; Diatoms; Zooplankton; Biological production; Upwelling; Population density; Cruises; Abundance; Geographical distribution; Biological production; Geographical distribution; Phytoplankton; Zooplankton; Population density; Diatoms; Http://aims.fao.org/aos/agrovoc/c_36649; Http://aims.fao.org/aos/agrovoc/c_5083; Http://aims.fao.org/aos/agrovoc/c_13344; Http://aims.fao.org/aos/agrovoc/c_15490; Http://aims.fao.org/aos/agrovoc/c_6112; Http://aims.fao.org/aos/agrovoc/c_32657.
Ano: 2004
URL: http://hdl.handle.net/1834/2297

Un système d'indicateurs de durabilité des pêcheries côtières comme outil de gestion intégrée des ressources halieutiques sénégalaises
Provedor de dados: 20
Autores: Thiao, Djiga.
Cette thèse est axée sur une analyse de la durabilité des pêcheries côtières qui aboutit  sur la proposition d’un système d’indicateurs comme  outil de gestion intégrée des ressources halieutiques sénégalaises.  L’objectif est d’encourager  une meilleure gouvernance de ces  systèmes halieutiques et côtiers dont l’exploitation est caractérisée par la complexité, la multiplicité et l’interactivité de plusieurs facteurs écologiques, économiques et sociaux. La stratégie adoptée est fondée sur l’approche systémique à travers  une vision multidimensionnelle et multi-acteurs  s’appuyant  sur le modèle PER (pression-état-réponse).  Le diagnostic  reflète  une détérioration générale de l’état  des écosystèmes côtiers  nécessitant  des mesures d’ajustement de la...
Tipo: Theses and Dissertations
Palavras-chave: Sustainable fishing; Inshore waters; Coastal zone management; Fisheries resources; Ecosystem management; Hydrology; Phytoplankton; Flora; Coastal environment; Sustainable development; Zooplankton; Ecology; Temperature; Salinity; Tourism; Rivers; Upwelling.
Ano: 2009
URL: http://hdl.handle.net/1834/5002

Calidad ambiental de la zona costera del Golfo de Batabanó, Cuba
Provedor de dados: 20
Autores: Martínez Canals, M.; Montalvo, J.F.; Miravet, M.E.; Lugioyo, M.; Loza, S.; Pérez, R.; García, I.; Rodríguez, A.; Cesar, M.E.; Esponda, S.; Sánchez, M.; Delgado, V.
The anthropogenic affectation was evaluated on the coast N of the Gulf of Batabanó in May 2003 (corresponding to the provinces of Matanzas and Havana), in areas located in the line of the coast. The results were compared with the historical information of the sector. In the coast N and the Ensenada of the Broa, the parameters oxygen saturation, DBO5 and DQO showed characteristic high values of eutrofication. The biggest contribution in the Cianoficies was in the near coastal areas to sources of organic contamination. In the case of the nutrients they show specific data of mesothrofic waters with tendency to the eutrofization and the silts presented a high affectation for toxic metals. The area near to Guanímar is distinguished to present conditions of...
Tipo: Proceedings Paper
Palavras-chave: Phytoplankton; Water quality; Primary production; Chemistry; Environmental monitoring; Phytoplankton; Water quality; Primary production; Chemistry; Environmental monitoring; Http://aims.fao.org/aos/agrovoc/c_13344; Http://aims.fao.org/aos/agrovoc/c_16061; Http://aims.fao.org/aos/agrovoc/c_34329; Http://aims.fao.org/aos/agrovoc/c_1522; Http://aims.fao.org/aos/agrovoc/c_37876.
Ano: 2006
URL: http://hdl.handle.net/1834/2172

Analyse de la variabilité spatio-temporelle des populations phytoplanctoniques observées dans le réseau national de surveillance du phytoplancton dans le golfe de Gabés
Provedor de dados: 20
Autores: Feki-Sahnoun, W.
Le long des côtes du golfe de Gabès, les données collectées dans le cadre du Réseau de Surveillance du Phytoplancton et des Phycotoxines (REPHY), constituent une base pertinente pour examiner la structure et la dynamique des communautés phytoplanctoniques à grandes échelles temporelle (1997-2007) et géographique (l’ensemble de littoral du golfe). S’appuyant sur les données du REPHY, l’objectif de cette étude était de décrire les principales formes de variabilité des communautés phytoplanctoniques observées sur nos côtes.  Les schémas de la variabilité des populations phytoplanctoniques ont été examinés à différentes échelles temporelles et géographiques à l’aide de méthodes statistiques multivariées. Dans un premier temps, l’analyse de la dynamique des...
Tipo: Theses and Dissertations
Palavras-chave: Phytoplankton; Temporal variations; Geographical distribution; Statistical analysis; Models.
Ano: 2013
URL: http://hdl.handle.net/1834/5444

Water quality trends and input loads to Lake Nakuru
Provedor de dados: 20
Autores: Kulecho, Andrew; Muhandiki, Victor.
Water quality trends of Lake Nakuru, Kenya and its feeder streams were monitored in 2001-2004. Water samples were obtained from eleven stations in the lake and five points on inflowing streams. The items monitored were physico-chemical and biological components. The drainage basin was characterized by recurrence of dry spells throughout the period with water losses in the lake exceeding the amount received to cause a fall in water volume. The lake water salts content rose – conductivity and alkalinity reached 58 ms/cm and 5,200 mg/l respectively. PH was more or less constant (10.00 – 10.36). Daytime oxygen concentration in the mid-lake system rose (to greater than 20 mg/l) while remaining low in the inflow portions of the lake. On one occasion, the lake...
Tipo: Proceedings Paper
Palavras-chave: Water quality; Biomass; Mortality causes; Anthropogenic factors; Phytoplankton; Pollution effects; Degradation; Man-induced effects; Inland waters; Freshwater pollution; Physicochemical properties; Inflow; Environmental monitoring; Land use; Urbanization; Environmental impact; Pollution; Freshwater.
Ano: 2006
URL: http://hdl.handle.net/1834/5312

Procesos planctónicos en el Golfo de Guayaquil (Campo Amistad) julio-agosto/2001
Provedor de dados: 20
Autores: Torres,  G.; Calderón, T.; Mero, M.; Franco, V.
This research is part of an environmental monitoring of plankton and its physical and chemical response around the platform located offshore Campo Amistad, near Santa Clara Island, southeast of the Gulf in external Guayaquil. The study was carried out between july 30 and augut 31-2001, onboard the R/V  Orión of the Oceanographic Institute of the Ecuadorian Navy. The chlorophyll "a" biomass presented values between 0.6 and 1.52 mg/m3 in surface waters, with averages of 1.07 to 0.99 mg/m3 (10 m), 0.79 (20 m) and 0.58 (30 m) mg/m3. The larger amounts of biomass and daily variability were found in the northern part of the platform, while the opposite trend was observed in its western area. One hundred and three phytoplankton species were identified, with...
Tipo: Journal Contribution
Palavras-chave: Phytoplankton; Chlorophylls; Biomass; Zooplankton; Environmental assessment; Producttion platforms; Nutrients (mineral).
Ano: 2003
URL: http://hdl.handle.net/1834/5762

Distribución del plancton a mesoescala en un área de reproducción de la anchoíta en la plataforma bonaerense
Provedor de dados: 20
Autores: Akselman, R.; Carreto, J.I.; Ramirez, F.C.
In order to determine the distribution patterns of phytoplanktonic and zooplanktonic species that constitute the main food of the argentine anchovy (Engraulis anchoita), a study was made within a coastal spawning area on meso-scaled space (approximately 7 miles between stations). It was observed the predominacne of the copepod Oithona helgolandica and copepodites stages of other small-sized species, thus inferring the preponderance of nauplii stages which constitute the main food of early anchovy larvae. A high spatial heterogeneity was found in the distrtibution of both phytoplanktonic and zooplanktonic communities. Phytoplankton showed a patchiness distribution both in horizontal and vertical directions. Diatoms, dinoflagellates and coccolithophoirids...
Tipo: Journal Contribution
Palavras-chave: Phytoplankton; Zooplankton; Trophic relationships; Population density; Horizontal distribution; Species diversity; Phytoplankton; Zooplankton; Species diversity; Population density; Http://aims.fao.org/aos/agrovoc/c_13344; Http://aims.fao.org/aos/agrovoc/c_15490; Http://aims.fao.org/aos/agrovoc/c_33954; Http://aims.fao.org/aos/agrovoc/c_6112.
Ano: 1986
URL: http://hdl.handle.net/1834/2034

Importancia ecológica del fitoplancton durante El Niño 1991-1993, en el Pacífico Ecuatorial (Ecuador)
Provedor de dados: 20
Autores: Torres, G.
El objetivo del estudio fue determinar su importancia ecológica y diversidad de los principales grupos del fitoplancton durante El Niño 1991-1992, en tres cruceros realizados en la época cálida-húmeda del ecosistema del Pacífico Ecuatorial (1991, 1992 y 1993).
Tipo: Journal Contribution
Palavras-chave: Marine ecology; Phytoplankton; Upwelling; Chlorophylls; Diatoms; Biological production; El Nino phenomena; Oceanographic stations; Multiship expeditions; Phytoplankton; Biological production; Marine ecology; Chlorophylls; Diatoms.
Ano: 2006
URL: http://hdl.handle.net/1834/2301

Estructura de la comunidad del fitoplancton en el área de El Rincón, Mar Argentino (febrero 2011)
Provedor de dados: 20
Autores: Negri, R.M.; Silva, R.I.; Segura, V.; Cucchi Colleoni, A.D.
The El Rincón area in the Argentine continental shelf (coastal sector between 39º S-41º S) is known as one of the main breeding areas of the Argentine anchovy (Engraulis anchoita) Northern stock. However, there is scarce information regarding the structure of the primary producers, base of the pelagic food webs. The aim of this study was to identify the different phytoplanktonic communities in a coastal section in the area (depth lower than 60 m) during February 2011. Mean surface chlorophyll a concentration was 0.72 mg m-3, with the highest value in the innermost station (E34: 1.84 mg m-3) and the lowest in the mid section (E31: 0.24 mg m-3). In depth, similar concentrations were registered, except for the deepest station where the maximum value was...
Tipo: Journal Contribution
Palavras-chave: Phytoplankton; Nannoplankton; Community composition; Size; Chlorophylls.
Ano: 2013
URL: http://hdl.handle.net/1834/5491

Micromundo marino
Provedor de dados: 20
Autores: Montolio, M.
De forma amena y muy didáctica se aborda la historia, la distribución, la diversidad, la supervivencia, la colecta de especies del plancton. Se incluyen ¿ sabías qué ? para mostrar los aspectos más interesantes y para comprobar conocimientos los juegos didácticos.
Tipo: Book
Palavras-chave: Zooplankton; Phytoplankton; Plankton; Nannoplankton; Zooplankton; Phytoplankton; Plankton; Http://aims.fao.org/aos/agrovoc/c_15490; Http://aims.fao.org/aos/agrovoc/c_13344; Http://aims.fao.org/aos/agrovoc/c_5950.
Ano: 2005
URL: http://hdl.handle.net/1834/2081

Estudio de las comunidades del fitoplancton y zooplancton en Monteverde, Península de Santa Elena, Ecuador durante noviembre de 2006
Provedor de dados: 20
Autores: Tapia, M.E.; Naranjo, Ch.
El presente estudio se efectuó frente a la localidad de Monteverde, Península  de Santa Elena, monitoreándose un total de 15 estaciones durante los estados de marea de flujo y reflujo en noviembre de 2006. Las mayores concentraciones de clorofila a: Se observó en la estación 9 en la capa superficial con valores de 0.90  mg/m3 determinándose como un área de mayor productividad y la menor concentración se registró en la estación 4 con valor de 0.10 mg/m3 durante la fase de flujo. En la comunidad fitoplanctónica se determinó dos áreas de mayor diversidad y abundancia de especies: La primera se observó en las estaciones 4 y 6 durante flujo registrándose la mayor abundancia relativa, la segunda corresponde a las estaciones 10 y 11 en reflujo. Se destaca la...
Tipo: Journal Contribution
Palavras-chave: Chlorophylls; Phytoplankton; Zooplankton; Biomass; Aquatic communities; Phytoplankton; Zooplankton; Biomass; Aquatic communities; Chlorophylls; Http://aims.fao.org/aos/agrovoc/c_13344; Http://aims.fao.org/aos/agrovoc/c_15490; Http://aims.fao.org/aos/agrovoc/c_926; Http://aims.fao.org/aos/agrovoc/c_553; Http://aims.fao.org/aos/agrovoc/c_1577.
Ano: 2009
URL: http://hdl.handle.net/1834/3348

Bioensayo de toxicidad (CL50) del dispersante de petróleo BP 1100 WD, con fitoplancton marino (Tetraselmis sp)
Provedor de dados: 20
Autores: Villamar, F.
El presente estudio se considera de carácter preliminar especialmente en lo referente al cálculo de la concentración media letal (CL50), de esta manera se evalúa el grado de toxicidad del dispersante de petróleo BP 1100 WD considerado como agente contaminante cuando se utiliza para dispersar manchas de petróleo regado en el mar. Con esta información se establece el impacto potencial que puede producir este dispersante en el medio ambiente marino.
Tipo: Journal Contribution
Palavras-chave: Bioassays; Toxicity; Phytoplankton; Dispersants; Pollution indicators; Toxicity; Phytoplankton; Dispersants.
Ano: 1996
URL: http://hdl.handle.net/1834/2191

Estudio de las comunidades del fitoplancton en los Ríos Daule, Guayas y Estero Salado
Provedor de dados: 20
Autores: Tapia, M.E.
El objetivo del presente estudio es evaluar la biomasa, diversidad y relación del fitoplancton con las comunidades planctónicas estuarinas basándose en las condiciones ambientales durante la época de verano.
Tipo: Journal Contribution
Palavras-chave: Phytoplankton; Distribution; Chlorophylls; Species diversity; Biomass; Rivers; Salt marshes; Environmental factors; Summer; Cell counters; Phytoplankton; Distribution; Biomass; Rivers; Environmental factors; Summer; Chlorophylls; Species diversity; Http://aims.fao.org/aos/agrovoc/c_13344; Http://aims.fao.org/aos/agrovoc/c_35773; Http://aims.fao.org/aos/agrovoc/c_926; Http://aims.fao.org/aos/agrovoc/c_6617; Http://aims.fao.org/aos/agrovoc/c_2594; Http://aims.fao.org/aos/agrovoc/c_7519; Http://aims.fao.org/aos/agrovoc/c_1577; Http://aims.fao.org/aos/agrovoc/c_33954.
Ano: 2002
URL: http://hdl.handle.net/1834/2292

Variabilidad estacional del fitoplancton y su relación con los parámetros ambientales en el estuario interior de Esmeraldas durante los años 2004-2005
Provedor de dados: 20
Autores: Tapia, M.E.
Se colectaron y analizaron un total de 96 estaciones distribuidas en cinco áreas de la Provincia de Esmeraldas durante los años 2004-2005. Se elaboraron gráficos de las especies (muestras de red de 50 µ) y la relación con los parámetros físicos y químicos. En la comunidad del fitoplancton presentó una variabilidad en la composición de especies, especialmente en el Terminal Petrolero durante septiembre del 2004 y disminuye en abril del 2005, la mayor densidad poblacional fue para el grupo de diatomeas. Las principales especies en el ambiente marino estuarino Climacosphenia monoligera, Pseudo-nitzschia paradoxa, Thalassiotrix frauenfeldii, Terpsinoe musica, Coscinodiscus excentricus. Las especies representativas en el ambiente marino Navicula tuscula,...
Tipo: Journal Contribution
Palavras-chave: Phytoplankton; Diatoms; Pollution; Estuaries; Station lists; Distribution.
Ano: 2012
URL: http://hdl.handle.net/1834/4653

Diatomeas y silicoflagelados del fitoplancton del Golfo de Guayaquil: II edición
Provedor de dados: 20
Autores: Jiménez, R.
Fueron estudiadas 44 muestras de plancton, de las cuales 189 especies y variedades de diatomeas y silicoflagelados fueron identificados. La mayoría de las especies son registradas por primera vez para el mar ecuatoriano. Las diatomeas centrales (centricae) es el más importante orden en el Plancton del Golfo, mientras las diatomeas pennales (Pennatae) es el orden más predominante en la región estuarina inferior. El análisis sistemático de cada especie incluye descripción, dibujos, medidas y referencias bibliográficas. Datos de temperatura, salinidad, clorofilas y producción primaria del Golfo de Guayaquil son consideradas como condiciones hidrobiológicas del área.
Tipo: Journal Contribution
Palavras-chave: Diatoms; Phytoplankton; Phytoplankton; Diatoms; Http://aims.fao.org/aos/agrovoc/c_13344; Http://aims.fao.org/aos/agrovoc/c_32657.
Ano: 1983
URL: http://hdl.handle.net/1834/2104

Determinación de la toxicidad en dispersantes de petróleo mediante bioensayos para calcular el CL50
Provedor de dados: 20
Autores: Villamar, F.; Tapia, M.E.
Este tipo de experimentación se ha centrado en la estimación de la Concentracion Letal Media (CL50), que significa el cincuenta por ciento de organismos muertos en un tiempo determinado.
Tipo: Journal Contribution
Palavras-chave: Toxicity; Bioassays; Detergents; Mortality; Dispersants; Phytoplankton; Toxicity; Bioassays; Detergents; Phytoplankton; Mortality; Dispersants; Http://aims.fao.org/aos/agrovoc/c_7826; Http://aims.fao.org/aos/agrovoc/c_15731; Http://aims.fao.org/aos/agrovoc/c_10349; Http://aims.fao.org/aos/agrovoc/c_13344; Http://aims.fao.org/aos/agrovoc/c_4945; Http://aims.fao.org/aos/agrovoc/c_32426.
Ano: 2004
URL: http://hdl.handle.net/1834/2319

Caractéristiques du phytoplancton de région de l'île Tidra (Mauritanie) en septembre et octobre 1980
Provedor de dados: 20
Autores: Severin-Reyssac, J.
Tipo: Journal Contribution
Palavras-chave: Phytoplankton; Plant populations; Population abundance (in number).
Ano: 1982
URL: http://hdl.handle.net/1834/4669

Fitoplancton de la Bahía de Nenguange (Parque Nacional Tayrona). Mar Caribe, Colombia
Provedor de dados: 20
Autores: Caycedo, I.E.
Durante el año de 1974-1975 se realizó un estudio preliminar sistemático y ecológico del fitoplancton en la Bahía de Nenguange, siendo identificadas setenta y cuatro especies. Las variaciones de temperatura y salinidad como la diversidad de las especies (número de especies más una medida relativa de abundancia), merecieron especial atención durante las épocas de mayor y menor precipitación. El mayor florecimiento que se pudo detectar, está integrado por diatomeas en su mayoría y comienza con la aparición de la estación lluviosa. Durante este periodo, la salinidad fue mínima y la temperatura máxima.
Tipo: Journal Contribution
Palavras-chave: Phytoplankton; Taxonomy; Identification keys; Phytoplankton; Taxonomy; Http://aims.fao.org/aos/agrovoc/c_13344; Http://aims.fao.org/aos/agrovoc/c_7631.
Ano: 1977
URL: http://hdl.handle.net/1834/3896

Distribución de clorofila "a" y feopigmentos en el Estrecho Bransfield, Bahía Chile y Paso Drake durante el verano de 1998 (Antártica)
Provedor de dados: 20
Autores: Torres Ch., G.
Se estima la productividad primaria en concentración de clorofila "a" y feopigmentos, como indicativo de la calidad del primer nivel trófico-fitoplancton, registrados en el Estrecho Bransfield, Bahía Chile (Noreste de la Isla Greenwich) y en el Paso Drake, durante la VII Expedición Ecuatoriana a la Antártida a bordo del B/I ORION durante el verano austral de 1998. La biomasa fitoplanctónica superficial de clrofila "a" en el Estrecho Bransfield, registró las mayores concentraciones (0.7-0-8 mg/m3) hacia el noreste del estrecho, y las menores concentraciones de 0.2 mg/m3 se localizaron hacia el centro. A nivel subsuperficial de los 20 m se registraron las más altas concentraciones de toda la columna de agua (0-100 m), con una distribution latitudinal casi...
Tipo: Journal Contribution
Palavras-chave: Chlorophylls; Pigments; Biomass; Biological production; Phytoplankton; Polar waters; Pigments; Biomass; Biological production; Phytoplankton.
Ano: 1998
URL: http://hdl.handle.net/1834/3846

Les efflorescences phytoplanctoniques dans le golfe de gabes (Tunisie) au cours de dix ans de surveillance (1995-2005)
Provedor de dados: 20
Autores: Feki, W.; Hamza, A.; Bel Hassen, M.; Rebai, A.
Les données du Réseau National de Surveillance Phytoplanctonique ont été examinées dans le golfe de Gabes durant la période 1995-2005. Un intérêt particulier a été attribué au phénomène de bloom phytoplanctonique. En outre, nous avons examiné plus spécifiquement les variations spatio-temporelles des espèces responsables et les relations avec la variabilité des conditions abiotiques, essentiellement la température, la salinité et le pH. Les résultats ont montré que la période allant d’août à janvier, avec des pics en septembre et janvier, semble être propice à des efflorescences algales. Les dinoflagellés sont responsables de 89% des cas ; l’espèce Karenia selliformis détient à elle seule 64% des occurrences de ce phénomène. Les blooms de K. selliformis,...
Tipo: Journal Contribution
Palavras-chave: Algal blooms; Environmental conditions; Phytoplankton; Salinity; Ph; Phytoplankton; Algal blooms; Environmental conditions; Salinity.
Ano: 2008
URL: http://hdl.handle.net/1834/3702

Composición del plancton en la Puntilla Santa Elena durante agosto 2002 (Ecuador)
Provedor de dados: 20
Autores: Torres, G.; Calderón, G.; Franco, V.; Cedeño, E.; Calderón, T.; Salazar, E.
Esta investigación comprende los estudios del fitoplancton-zooplancton-ictioplancton, realizados en tres sitios de la Península Santa Elena durante agosto 2002, área designada para la proyección de "Arrecife Artificial de las Fuerzas Militares del Ecuador": un avión, barco y tanque de guerra, estructuras artificiales consideradas como basura chatarra (de gran tamaño), que serían recicladas para la bio-exploración artificiales hacia la seguridad de los recursos marinos del Ecuador. En el Estudio Ambiental se describen las consideraciones necesarias de carácter multidisciplinario (EIA-INOCAR, 2002).
Tipo: Journal Contribution
Palavras-chave: Biological production; Artificial reefs; Plankton; Zooplankton; Phytoplankton; Ichthyoplankton; Biological production; Plankton; Zooplankton; Phytoplankton; Artificial reefs; Http://aims.fao.org/aos/agrovoc/c_36649; Http://aims.fao.org/aos/agrovoc/c_5950; Http://aims.fao.org/aos/agrovoc/c_15490; Http://aims.fao.org/aos/agrovoc/c_13344; Http://aims.fao.org/aos/agrovoc/c_25395.
Ano: 2004
URL: http://hdl.handle.net/1834/2343

Results of the Environmental Impact Assessment for the Saltpond Offshore Programme  -Plankton Baseline Study
Provedor de dados: 20
Autores: Yaqub, B.H.
A report on plankton baseline studies conducted in the Saltpond Oil Field, Ghana.
Tipo: Report
Palavras-chave: Phytoplankton; Zooplankton; Plankton; Ichthyoplankton; Offshore; Salt water; EIA (environmental impact assessment); Salt water; Plankton.
Ano: 2013
URL: http://hdl.handle.net/1834/5326

Interpretation of particle spectra of electronic counters by microscopical methods
Provedor de dados: 27
Autores: Bakker, C.; Prins, T.C.; Tackx, M.L.M.
1. Using monocultures or single species dominated natural phytoplankton, cell counts and volume estimations obtained by visual and electronic methods show reasonable agreement.Calibration seems possible (Figs.1-2).2. Further examples given (Fig. 3-4) show that microscopical identification of the volume peaks in electronic counter spectra of natural seston is not quite simple. Phytoplankton peaks may not be detected in the Counter spectrum. Shifts of Counter peaks to the left side of the visual spectrum may be found when cylindrical, elongated or needle- like phytoplankton dominate the sample.3. Both visual and electronic methods include potentially large errors. Possibly particle volume is either overestimated by the microscope and / or underestimated by...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Detritus; Grazing; Measuring devices; Particle counters; Particle size; Phytoplankton; Zooplankton.
Ano: 1985
URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=3195

Calculations of results in grazing experiments using the counting method
Provedor de dados: 27
Autores: Tackx, M.L.M.; Van de Vrie, E.M.
Different formulae used in the literature for calculation of ingestion rates are reviewed. Their applicability is discussed in relation to two criteria: the occurrence of saturation of the feeding and/or growth of the food particles. It is shown by simulations that the differences in results obtained by calculating ingestion following a linear or an exponential model are restricted to a few percent. Calculation of ingestion rates by substantial over- or underestimation depending on the growth constant of the food particles and the grazing time.The formula I = Vk(C&lt;sub&gt;zt&lt;/sub&gt;C&lt;sub&gt;zo&lt;/sub&gt;e&lt;sup&gt;kt&lt;/sup&gt;)/N(I-e&lt;sup&gt;kt&lt;/sup&gt;) is proposed for the calculation of ingestion rates under saturated circumstances.It...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Food intake; Food intake; Grazing; Ingestion; Mathematical analysis; Measuring devices; Phytoplankton; Zooplankton.
Ano: 1985
URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=3212

The meiobenthos of subtidal sandbanks on the Belgian Continental Shelf (Southern Bight of the North Sea)
Provedor de dados: 27
Autores: Vanaverbeke, J.; Gheskiere, T.; Vincx, M.
The Belgian Continental Shelf (BCS) is characterized by a set of isolated subtidal sandbank systems, which greatly increase the habitat heterogeneity of the area. The meiobenthos of these sandbanks was investigated during 1997 and 1998. In total, 10 sandbanks have been sampled, belonging to three different geographically isolated systems: the Flemish Banks, the Hinder Banks and the Zeeland Banks. No obvious differences in sedimentological characteristics between the sandbanks were found, but biologically some differences could be detected. The more offshore Hinder Banks had the most diverse meiobenthos, while the Flemish Banks harboured the lowest number of meiobenthic taxa. Seasonal and regional differences in terms of densities are a result of a coupling...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Meiobenthos; Phytoplankton; Sand banks; Sediment properties.
Ano: 2000
URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=5343

Determination of seasonal phytoplankton communities, based on quantitative data using a mathematical analysis
Provedor de dados: 27
Autores: Caljon, A.
The definition of algal communities has always been a very discussed subject. We applied a principal component analysis on quantitative phytoplankton data. This ordination technique made it possible to distinguish the algal groups present. This technique is very often applied in the phytosociology of higher plants but less frequently in the phytosociology of algae. Till now this ordination has been used in phycology, merely for marine- and freshwater benthic algae, e.g. the benthic diatoms of rivers (Descy 1976a, b).
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Community composition; Mathematical analysis; Phytoplankton; Seasonal variations.
Ano: 1978
URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=3581

Composition and abundance of phytoplankton &amp;#305;n relation to physical and chemical variables in The Kars River, Turkey
Provedor de dados: 85
Autores: Özbay,H.
The phytoplankton of the Kars River was studied from May to October 2005 at five sampling stations. Sixty-six phytoplankton taxa were determined, consisting of Cyanophyta (9), Chlorophyta (25), Euglenophyta (18), Bacillariophyta (7), Cryptophyta (3), Dinophyta (1) and Chrysophyta (3). Total phytoplankton density increased from May to July and then decreased until October. The dominant phytoplankton group was Cyanophyta (36.5 - 64.4%) for most of the study period, followed by Bacillariophyta (20.4 - 38.7%) and Chlorophyta (20.9 - 28.9%). Temperature, pH and dissolved oxygen ranged from 9.6 °C to 21.6 °C; 7.6 to 8.0, and 5.9 to 7.4 mg/L, respectively. Chlorophyl a level changed from 0.0025 to 0.0059 mg/L. On the other hand, both phosphate and nitrogen levels...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: River Kars; Running water; Phytoplankton; Environmental factors.
Ano: 2011
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1851-56572011000100013

Pigmented Euglenophytes in a natural and shallow lake in the semiarid region of Paraíba State, Brazil
Provedor de dados: 88
Autores: Araujo,Gabrielle Joanne Medeiros; Barbosa,José Etham de Lucena; Barbosa,Luciana Gomes.
A floristic survey of the class Euglenophyceae in Panati Lake (7º11'14" S and 36º49'52" W) is presented. The samples were collected between November 2005 and April 2007 along the margins of the lake, and a total of 29 taxa were collected, described, and illustrated, comprising 11 specifics and 18 infraspecifics, with five typical and 13 non-typical varieties. The genus Trachelomonas showed the greatest richness (13 taxa), followed by the genus Lepocinclis (seven taxa). All of the 29 taxa cataloged had been previously reported for Brazil, most with wide geographical distributions, but all were new records for Paraíba State, and 25 new for northeastern Brazil - reflecting the need for more taxonomic studies of the Euglenophyceae in these locations.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Euglenophyceae; Flora; Phytoplankton.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84042012000100004

Planktonic diatoms in lotic and lentic environments in the Lago dos Tigres hydrologic system (Britânia, Goiás, Brazil): Coscinodiscophyceae and Fragilariophyceae
Provedor de dados: 88
Autores: Dunck,Bárbara; Nogueira,Ina de Souza; Machado,Maria das Graças.
A floristic study of Coscinodiscophyceae and Fragilariophyceae in the Lago dos Tigres hydrologic system is presented. Phytoplankton samples were collected with a plankton net (25 µm mesh) at 11 sampling stations, three in lotic areas and eight in lacustrine zones. Eleven species of Coscinodiscophyceae and eight of Fragilariophyceae were identified; descriptions, comments, their geographic distributions for the midwestern region of Brazil, type of environment (lentic/lotic), and illustrations are provided. Among the taxa found, 13 were recorded for the first time in midwestern Brazil: Aulacoseira alpigena, A. distans, A. granulata var. angustissima, A. granulata var. valida, A. muzzanensis, Discostella stelligera var. stelligera, Fragilaria capucina var....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Algae; Bacillariophyta; Inventory; Phytoplankton.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84042012000200007

Effects of nutrient impoverishment on phytoplankton biomass: a mesocosms experimental approach in a shallow eutrophic reservoir (Garças Pond), São Paulo, southeast Brazil
Provedor de dados: 88
Autores: Crossetti,Luciane O; Bicudo,Carlos E. de M.
Nutrient impoverishment in mesocosms was carried out in a shallow eutrophic reservoir aiming to evaluate the nutrient removal technique as a method for eutrophication reduction. Garças Pond is located in the Parque Estadual das Fontes do Ipiranga Biological Reserve situated in the southeast region of the municipality of São Paulo. Three different treatments were designed, each consisting of two enclosures containing 360 liters of water each. Mesocosms were made of polyethylene bags and PVC pipes, and were attached to the lake bottom. Treatment dilutions followed Carlson's trophic state index modified by Toledo and collaborators, constituting the oligotrophic, mesotrophic, and eutrophic treatments. Ten abiotic and 9 biological samplings were carried out...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Biomass; Impoverishment; Mesocosms; Phosphorus; Phytoplankton.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84042005000100009

Variability of δ13C and δ15N in three zooplankton species from the Upper Paraná River floodplain
Provedor de dados: 103
Autores: Santana,Ana R. A.; Lansac-Tôha,Fabio Amodêo; Benedito,Evanilde.
This study evaluated the isotopic composition of three zooplankton species - Notodiaptomus amazonicus (Wright, 1935), Moina minuta Hansen, 1899 and Bosmina hagmanni Stingelin, 1904 - from the Upper Paraná River floodplain. We predicted that there would be isotopic variability among species in the different sampled environments. Samplings were conducted in three lakes from the Baía subsystem and in two lakes from the Paraná subsystem. At each location, some abiotic variables were measured, and zooplankton (3 to 4) and phytoplankton (3) samples were taken. The species sampled did not present significant differences between subsystems; however, they were different among the lakes, with variations of about 10.8‰ for δ13C and 5.8‰ for δ15N. The isotopic values...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Food web; Limnology; Phytoplankton; Energy; Stable isotopes.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702009000400017

Sensitivity of winter phytoplankton communities from Andean lakes to artificial ultraviolet-B radiation
Provedor de dados: 97
Autores: HELBLING,E. WALTER; VILLAFAÑE,VIRGINIA E.; BARBIERI,ELENA S.
During July of 1999 sampling was carried out in five Andean lakes to determine the sensitivity of winter phytoplankton communities to ultraviolet-B radiation (UV-B, 280-320 nm). The studied lakes, Moreno, El Trébol, Nahuel Huapi, Gutiérrez, and Morenito, located in the Patagonia region (41° S, 71° W, 800 m of altitude), had attenuation coefficients for UV-B that ranged from 0.36 m-1 (Lake Moreno) to 2.8 m-1 (Lake Morenito). The samples were inoculated with labeled carbon (NaH14CO3) and incubated in an illuminated chamber (UV-B = 0.35 W m-2, UV-A [320-400 nm] = 1.1 W m-2, and PAR [400-700 nm] = 10.8 W m-2) at 10 °C. The phytoplankton cells were exposed to UV radiation (280-400 nm) + PAR (quartz tubes), and to UV-A + PAR (quartz tubes covered with Mylar-D)....
Tipo: Journal article
Palavras-chave: Ultraviolet-B radiation; Photosynthesis; Phytoplankton; Ozone; Andean lakes.
Ano: 2001
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2001000200005

Multiscale upwelling forcing cycles and biological response off north-central Chile
Provedor de dados: 97
Autores: RUTLLANT,JOSÉ; MONTECINO,VIVIAN.
The physical forcing of the upwelling along the subtropical west coasts of the continents encompasses a broad range of time scales which shape both phytoplankton biomass (Chl-a) and primary productivity (carbon fixation) changes over any given time interval. The narrow continental shelf and the steep alongshore orography off north-central Chile provide for a unique combination of year-round, upwelling-favorable winds with quasi-weekly upwelling pulses associated with atmospheric coastal-trapped disturbances (coastal lows). This variability is modulated by intraseasonal oscillations in the depth of the thermo/nutricline, produced by coastal-trapped waves in the ocean, upon which annual (seasons) and interannual (ENSO) cycles are superimposed. During coastal...
Tipo: Journal article
Palavras-chave: Chile; Coastal upwelling; Phytoplankton; Local and remote upwelling forcing cycles; Coastal-trapped waves; ENSO cycle.
Ano: 2002
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2002000100020

Ecomicrobiology and microbial assimilative capacity of the oligotrophic Andean Lake Laja, Chile
Provedor de dados: 97
Autores: KARRASCH,BERNHARD; WOELFL,STEFAN; URRUTIA,ROBERTO; GONZÁLEZ,JENNY; VALDOVINOS,CLAUDIO; CID,HERNÁN; PARRA,OSCAR.
A strong socio-economic development pressure in South Chile will more and more cause an impact to the present lakes and rivers. Nevertheless, our knowledge concerning the ecological structure and the microbial self-purification capabilities of these lacustrine water bodies is scant but essential for a future sustainable development of land and water use. We studied Lake Laja, a lake already heavily impacted by water diversions for hydropower generation and irrigation. Typical for the Andean region Lake Laja is an oligotrophic water body, limited by nitrogen nutrients. Only very low chlorophyll a and particulate organic carbon (POC) concentrations and a small abundance and biomass of bacteria (mainly ultramicrobacteria) and heterotrophic flagellates were...
Tipo: Journal article
Palavras-chave: Bacterioplankton extracellular enzymes heterotrophic flagellates N-limitation; Phytoplankton.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2011000300010

Marine photosynthetic eukaryotes in polar systems: Unveiling phytoplankton diversity and composition in Antarctic waters
Provedor de dados: 97
Autores: DE LA IGLESIA,RODRIGO; TREFAULT,NICOLE.
Antarctic waters are a particular marine environment mainly due to the strong seasonal variations that various parameters are subject to, like light availability and temperature. As in all oceanographic regions, food webs are sustained by photosynthetic microorganisms, which in the case of Antarctic environments seem to be strongly dominated by its eukaryote component. Assessing the ecological role of photosynthetic microbial eukaryotes requires a basic knowledge of their diversity and community composition. This review integrates the available information regarding this component of Antarctic phytoplankton as a way to unveil its diversity and how they respond to the strong changes that occur in this environment. Although several studies indicate the...
Tipo: Journal article
Palavras-chave: Antarctic; Biodiversity; Photosynthetic eukaryotes; Phytoplankton; Antártica; Biodiversidad; Eucariontes fotosintéticos; Fitoplancton.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2012000400006

Considerations regarding the dominance of Cylindrospermopsis raciborskii under low light availability in a low phosphorus lake
Provedor de dados: 39
Autores: Tonetta,Denise; Hennemann,Mariana Coutinho; Brentano,Débora Monteiro; Petrucio,Mauricio Mello.
ABSTRACTAlthough many studies have shown that the dispersion, increased abundance and dominance of cyanobacteria can be attributed to nutrient enrichment, we discuss features contributing to the dominance of Cylindrospermopsis raciborskii in a shallow, polymictic, subtropical coastal lake with low phosphorus and light limitation (Peri Lake). The presence and dominance of C. raciborskii in an environment with such characteristics emphasizes the idea that nutrients alone do not explain the high density of this cyanobacterium. Other features should be considered in explaining this species dominance, such as phosphorus storage and physiological flexibilitywhich seem to be key features to high densities in low phosphorus systems.
Tipo: Info:eu-repo/semantics/other
Palavras-chave: Cyanobacteria; Cyanotoxins; Freshwater; Nutrients; Peri Lake; Phytoplankton; Plasticity; Subtropical.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062015000300448

A note on the seasonally shifting zone of high primary production in the Bay of Marajó, Pará, Brazil, 1983-1984
Provedor de dados: 39
Autores: Schwassmann,H.O; Barthem,R.B; Carvalho,M.L.
To understand the hydrological and limnological conditions during the annual regime of high and low river flow, as well as the action of the tides, a series of 18 collecting trips were conducted in monthly and bimonthly intervals across the Bay of Marajó during the years 1983-1985. The Tocantins River provides more than 80% of the inflow into this bay and shows a much greater difference in water volume flow between high and low water season than the Amazon. The annual displacement of brackish water influence is thus more extensive Marajó Bay than in the Amazon estuary. During the dry season of low river discharge (September-December), traces of seawater are found to penetrate up to 90 km upriver in the Guamá River. The high degree of turbidity of inner...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Limnology; Amazon Estuary; Tidal Rivers; Estuary Hydrodynamics; Phytoplankton.
Ano: 1988
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33061988000300014

The necessity of management in a lake of the Atlantic Forest biodiversity hotspot: nitrogen levels connected to a persistent bloom of Cylindrospermopsis raciborskii
Provedor de dados: 39
Autores: Figueredo,Cleber Cunha; Rückert,Gabriela von; Giani,Alessandra.
ABSTRACT Conservational studies of the threatened Atlantic Forest biome are frequently restricted to terrestrial ecosystems. We know little about the water bodies, specially considering that this biome covers the third largest system of lakes in Brazil. Some of these lakes are located inside the protected "Rio Doce State Park", but many others are found outside this reserve. These external lakes are seldom studied, but understanding their response to human activities is essential for the conservation and the protection of the lakes inside the Park. We evaluated the effects of degradation in a lake outside the Park, which shows a constant bloom of the toxic invasive cyanobacteria Cylindrospermopsis raciborskii. Phytoplankton, climate and physico-chemical...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cylindrospermopsis raciborskii; Invasive species; Lake conservation; Phytoplankton; Water deterioration.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062016000200222

Scientometrical review of Dinoflagellate studies in Brazil
Provedor de dados: 39
Autores: Noga,Pietro Martins Barbosa; Gomes,Doriedson Ferreira.
ABSTRACT Scientific production in developing countries is currently increasing, but there is still an unbalanced distribution of scientific production between developed and developing countries. With the need to elucidate disparities in scientific production, this paper aims to review publications on dinoflagellates in Brazil by discussing spatial and temporal trends. A search for papers referring to dinoflagellates was performed in the Scopus database up to the year of 2016. A total of 125 papers were found, but only 106 were selected according to established criteria. A linear regression was used to evaluate the increasing temporal trend in production and non-parametric ANOVA for comparisons among study categories. Dinoflagellate and toxic taxa-based...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Dinophyta; Harmful algae blooms; Phytoplankton; Public investments; Scientometry.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062018000400503

New records of Cosmarium Corda ex Ralfs (Desmidiaceae, Zygnematophyceae) in a tributary of the Itaipu Reservoir, Paraná, Brazil
Provedor de dados: 39
Autores: Biolo,Stefania; Bueno,Norma Catarina; Siqueira,Natália Silveira; Moresco,Carina.
This work is part of a survey of the desmid flora in a tributary of the Itaipu Reservoir, in the state of Paraná, Brazil. The objective was to expand the knowledge base regarding the genus Cosmarium (Desmidiaceae, Zygnematophyceae). We conducted a qualitative analysis of 60 samples of phytoplankton, which were collected from along the banks of the São Francisco Falso River between July of 2003 and June of 2004. We identified, drew, and described 18 taxa of Cosmarium. Of those 18 taxa, 8 represent new records for the state of Paraná: C. angulosum Bréb. var. angulosum, C. bireme Nordst. var. bireme, C. clepsydra Nordst. var. clepsydra, C. cf. galeritum Nordst. var. borgei, C. ginzbergeri, C. norimbergense Reinsch var. norimbergense, C. protractum (Nägeli) De...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Algae; Desmids; Phytoplankton; Taxonomy.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062013000100001

Phytoplankton composition and functional groups in a tropical humic coastal lagoon, Brazil
Provedor de dados: 39
Autores: Alves-de-Souza,Catharina; Menezes,Mariângela; Huszar,Vera.
This paper presents the composition and functional groups of the phytoplankton from Comprida lagoon, a tropical humic coastal Lagoon located in Southeast Brazil. A total of 28 taxa was found, distributed in eight taxonomic divisions as follows: 26% Heterokontophyta, 21% Chlorophyta, 21% Cyanophyta, 14% Bacillariophyta, 14% Cryptophyta, and 4% Prymnesiophyta. Twenty-three taxa were identified at the specific and infraspecific levels, from which four are new records for Brazil and two for Rio de Janeiro State. Phytoplankton of the Comprida lagoon was comprised of several flagellates, but also eukaryote and prokaryote picoplankton, filamentous cyanobacteria and several diatoms. The biomass was lower than that found in other lacustrine systems, and showed...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Phytoplankton; Tropics; Humic systems; Coastal lagoons; Functional groups; Southeast Brazil.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062006000300019

Relationship between phytoplankton structure and environmental variables in tropical reservoirs with different trophic states
Provedor de dados: 39
Autores: Oliveira,Simone Alves de; Ferragut,Carla; Bicudo,Carlos Eduardo de Mattos.
ABSTRACT Phytoplankton structure is influenced by environmental factors, seasonal cycles and the trophic state of the system. The objective of the present study was to identify guilds of phytoplankton species that are representative of seasonality and trophic status. We evaluated phytoplankton biomass and species composition in five tropical reservoirs, with different trophic states and during rainy and dry periods. At most of the sampling sites, total biomass was higher during the rainy season. Moreover, high cyanobacterial biomass was observed in all reservoirs except for one of the mesotrophic reservoirs, which had no significant contribution from the group. Phytoplankton guilds associated with the trophic gradient and seasonality were identified....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cyanobacteria; Phytoplankton; Guild; Reservoir; Seasonality.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062020000100083

Potential effects of mechanically removing macrophytes on the phytoplankton community of a subtropical reservoir
Provedor de dados: 39
Autores: Wojciechowski,Juliana; Burda,Tamires Marcela; Scheer,Mauricio Bergamini; Costa,Elaine Aparecida Dias da; Fernandes,Luciano Felício.
ABSTRACT Intensive growth of aquatic macrophytes interferes with water quality and ecosystem dynamics worldwide. Although mechanically removing macrophytes is the most commonly used method for their eradication, it can also cause undesirable disturbances in aquatic reservoir communities. We performed laboratory incubations of phytoplankton sampled before and after macrophytes were mechanically removed from the Piraquara II reservoir, South Brazil. We analyzed changes in growth and composition of the main phytoplankton groups with respect to nutrient shifting. Prior to removing the macrophytes, the phytoplankton community was dominated by low cell abundances of diatoms and flagellates. In contrast, growth rates of cyanobacteria (mainly Cylindrospermopsis...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Chlorophytes; Cyanobacteria; Diatoms; Macrophytes; Mechanical removal; Phytoplankton; Reservoir management.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062018000400588

Cyanobacteria community in two tropical eutrophic reservoirs in northeastern Brazil
Provedor de dados: 3
Autores: Oliveira, Fábio Henrique Portella Corrêa de; Silva, Joanne D'Arc Bezerra da; Costa, Anapaula Nunes Silvestre Fernandes; Ramalho, Waldemir Pimentel; Moreira, César Henrique Pinto; Calazans, Tiago Luiz Santana.
This study investigated the effect of seasonality on the Cyanobacteria community in two tropical eutrophic reservoirs in northeastern Brazil. Monthly samplings were conducted in the sub-surface of reservoirs. The following abiotic variables were analyzed: apparent color, turbidity, conductivity, alkalinity, calcium, magnesium, sodium, potassium, sulfate, total phosphorous, ammonia, nitrate, nitrite, chlorides, total hardness and chlorophyll-a, according to APHA (2012). Cyanobacteria density was quantified through biomass. Data were analyzed using one-way ANOVA and Redundancy Analysis (RDA). Higher mean values of Cyanobacteria biomass occurred in the dry (9.9mm3 L-1) and rainy (19.0mm3 L-1) season in Jucazinho and Carpina reservoirs, respectively,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Abiotic parameters; Phytoplankton; Seasonality.
Ano: 2015
URL: http://periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/26418

Sodium and nitrate favor the steady state of cyanobacteria in a semiarid ecosystem
Provedor de dados: 3
Autores: Oliviera, Fábio Henrique Portella Corrêa de; Dantas, Ênio Wocyli.
This study characterized steady state events (SS) in a semiarid reservoir (Brazil) dominated by cyanobacteria for 130 weeks, and evaluated the influence of different abiotic variables on their occurrence. It was hypothesized that, in semiarid reservoirs, steady state events are independent from seasonality and influenced by high nutrient concentrations, and steady state periods show low variation of species. Our data revealed the occurrence of SS events in both the dry and wet seasons. Higher concentrations of nitrate and sodium together with higher values of color favored the development of SS. Species composing the SS dominated by Microcystis aeruginosa (Kützing) Kützing was correlated with higher sulfate concentrations, while higher values of turbidity...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Abiotic variables; Driving force; Equilibrium phase; Phytoplankton; Tropical ecosystems.
Ano: 2019
URL: http://periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/47924

Drinking water: problems related to water supply in Bahía Blanca, Argentina
Provedor de dados: 40
Autores: Echenique,Ricardo; Giannuzzi,Leda; Ferrari,Luis.
In April 2000, alterations in drinking water quality, such as turbidity and odors similar to those of organochloride pesticides, were detected at Bahía Blanca (Argentina). This fact was associated to reports of dermic reactions and respiratory problems in the population. Samples drawn from Paso de las Piedras reservoir, two water treatment plants of at inlet and outlet points and at several particular houses were analyzed. Total phytoplankton in the reservoir varied between 49440 and 84832 cells.ml-1, while dominant species was, Anabaena circinalis. Efficiency to remove microorganisms (ER) by the treatment plants considering cell number of total phytoplankton was analyzed. Bacteriological analysis, qualitative and quantitative studies of phytoplankton,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cyanobacteria; Phytoplankton; Blooms; Biogenic odour compounds.
Ano: 2006
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1851-37432006000200001

Phytoplankton community of Reis lake in the Brazilian Amazon
Provedor de dados: 42
Autores: SILVA,ISE G.; MOURA,ARIADNE N.; DANTAS,ENIO W.
Reis Lake is located in the municipality of Caracaraí, state of Roraima (Brazil) and is subject to fluctuations in water level. The aim of this study was to analyze the structure of the phytoplankton community on the nictemeral and seasonal scales and determined the influence of limnological variables. Sampling was performed in the rainy season (June/2006) and dry season (November/2006), considering two nictemeral cycles. The phytoplankton community was assessed with regard to composition and density, abiotic variables were analyzed simultaneously. The lake had low concentrations of oxygen, clinograde profile and water stratified during the day and homogenous at night, with low concentrations of nutrients and waters ranging from slightly acidic to...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Phytoplankton; Nictemeral; Floodplain; Seasonal; State of Roraima.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652013000200649

Plankton diversity and limnological characterization in two shallow tropical urban reservoirs of Pernambuco State, Brazil
Provedor de dados: 42
Autores: Almeida,Viviane L.S.; Melão,Maria da Graça G.; Moura,Ariadne N.
Plankton diversity, physical and chemical variables and chlorophyll a were analyzed in two shallow urban reservoirs with different trophic degrees on Pernambuco State, northeastern Brazil. High eutrophication levels were observed in Apipucos reservoir, while Prata reservoir was considered oligotrophic. Values reported for physical and chemical variables and chlorophyll a differed among the studied ecosystems. Richness and plankton diversity were higher in Apipucos reservoir especially for phytoplankton. The presence of potential toxic Cyanophyceae in both reservoirs reflects a problem mainly to Prata reservoir, which is used for public water supply. Differences were observed for some variables among sites of study in Apipucos reservoir, while the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Northeastern Brazil; Phytoplankton; Trophic status; Zooplankton.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652012000200022

Morphology and ecology of the planktonic diatom Palmerina hardmaniana (Greville) Hasle in southern Brazil
Provedor de dados: 49
Autores: Garcia,Marinês; Odebrecht,Clarisse.
The diatom Palmerina hardmaniana (Greville) Hasle presents a wide geographical distribution in neritic tropical and subtropical regions. In the present work we analyzed plankton samples collected monthly between 1995 and 2007 at the surf zone of Cassino Beach, RS (32° 12' S and 52° 10' W), and in winter 2005 and summer 2007 at the continental shelf and slope in southern Brazil, Santa Marta Grande Cape, SC and Albardão-Chuí, RS regions (28° 23'-33° 07' S and 48° 41'-52° 26' W). We present the detailed morphological description of P. hardmaniana, and the first study including electron scanning microscope observations for material from the southwestern Atlantic Ocean. The morphometric data confirm the identity of the species in all its ultra-structural...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Phytoplankton; Seasonal variation; Biogeography; Ultra-structure.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032008000200009

The composition and new records of micro- and mesophytoplankton near the Vitória-Trindade Seamount Chain
Provedor de dados: 49
Autores: Lubiana,Karoline Magalhães Ferreira; Dias Júnior,Camilo.
Abstract In spite of the length of the Brazilian coastline, studies of marine phytoplankton species in offshore areas have been largely neglected. Regarding phytoplankton species composition, the aim was to assess biodiversity status, species frequency, and the similarities at different sites along the Vitoria-Trindade Seamount Chain. Phytoplankton net samples were analyzed. One hundred and seventy five infrageneric taxa were identified. They represented four phyla, viz., Cyanobacteria, Bacillariophyta, Dinophyta, and Ochrophyta. Dinophyta was the most diverse, and its genus Tripos the largest contributor. This genus also represented more than half of the most common taxa in the sampled area. Thirty-five new infrageneric taxa were recorded, 12 of which are...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: South Atlantic; Tripos; Oceanic islands; Phytoplankton; Biodiversity.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032016000300206

FIRST CHARACTERIZATION OF THE PLANKTONIC COMMUNITY IN THE NORTHERN SECTOR OF THE JOINT REGIME AREA JAMAICA - COLOMBIA
Provedor de dados: 50
Autores: Gutiérrez-Salcedo,José Manuel; Cabarcas-Mier,Angélica; Suárez-Mozo,Nancy.
The Joint Regime Area Jamaica-Colombia (JRA) is a sector of economic importance for Colombia but its biodiversity is unknown due to the difficult access. Therefore, the Institute of Marine and Coastal Research - Invemar in agreement with the National Hydrocarbon Agency - ANH, made an expedition in 2011 to obtain a first approximation to the diversity of the JRA. Within the groups studied was the plankton, which was collected around landforms at 21 sampling stations in the northern sector of the JRA, with special plankton nets of 20 µm pore size mesh for phytoplankton and 200 µm for zooplankton. Organisms were identified to the lowest possible taxonomic category and an ecological analysis was performed using descriptive statistics, univariate and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Phytoplankton; Zooplankton; Joint Regime Area.
Ano: 2015
URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0122-97612015000200007

Identification of phytoplankton blooms in the Gerlache Strait, West Antarctic Peninsula
Provedor de dados: 50
Autores: Cañón Páez,Mary Luz; Santamaría del Ángel,Eduardo.
ABSTRACT In order to identify phytoplankton blooms, the inherent optical properties index (IOPIndex) was used in surface water samples and the maximum chlorophyll-a (MPC) that were taken in the Third (January 2017) and in the Fourth Expedition (January 2018) from Colombia to Antarctica in the Gerlache Strait (EG). The IOPIndex is calculated from the standardized spatial anomalies of the phytoplankton, detritus and colored dissolved organic matter (CDOM) absorption coefficients using wavelength 443. In addition, the phytoplankton size index was calculated using the Blue / Red ratio and this related to the IOPIndex to determine the size structure of the phytoplankton responsible for the blooms. In 2017, four stations were identified under bloom conditions,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Absorption coefficients; Inherent optical properties index; Size index; Gerlache Strait; Phytoplankton.
Ano: 2021
URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0122-97612021000300013

The influence of hydrodynamics on the spatial and temporal variation of phytoplankton pigments in a large, sub-tropical coastal lake (Brazil)
Provedor de dados: 52
Autores: Cardoso,Luciana de Souza; Marques,David da Motta.
This study evaluated the spatial and temporal distribution of phytoplankton pigments in Itapeva Lake and its relationship with hydrodynamic aspects. Regarding spatial distribution, a decreasing N®S gradient was generally observed for the pigments, except in summer. This inversion observed during the summer was influenced by the predominant fetch (N-E). The horizontal heterogeneity was proved (ANOVA) for all seasons of the year, except spring. Spatially in spring, the vertical variance was much more significant (p&lt;0.05) than the horizontal one. The sampling shifts presented a permanent degree of variability among the seasons of the year, showing the existence of a diurnal cycle in the concentration of chlorophyll a. This behavior was related to the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Pigment; Phytoplankton; Shallow lake; Hydrodynamics; Wind; Bloom.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132004000400013

Limnological patterns in northern pantanal lagoons
Provedor de dados: 52
Autores: Bleich,Monica Elisa; Silveira,Roberto Moraes Lima; Nogueira,Flávia Maria Barros.
The aim of this work was to correlate the limnological patterns recorded among ten lagoons in the northern part of the Pantanal of Mato Grosso with some aspects of the lagoons related to their physical and biological characteristics. Some lagoon characteristics, such as connection with the river and the presence of floating macrophytes were important to group similar lagoons into categories. Attempts were also made to determine which kind of the nutrients could be limiting phytoplankton productivity in the lagoons of the northern Pantanal. Data was collected in nine lagoons during the flooding stage in January 2004, and nutrient and chlorophyll a was followed in a tenth lagoon from June 2004 to October 2004. The phytoplankton biomass was significantly...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Nutrient; Lagoon; Pantanal; Phytoplankton.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132009000300028

Limnological characteristics and seasonal changes in density and diversity of the phytoplanktonic community at the Caçó pond, Maranhão State, Brazil
Provedor de dados: 52
Autores: Dellamano-Oliveira,Maria José; Senna,Pedro Américo Cabral; Taniguchi,Glória Massae.
Seasonal changes of the phytoplanktonic community and limnological abiotic characteristics of Caçó pond (Maranhão State, Brazil) was evaluated from two field researches during the rainy (April 1999) and dry (November 1999) seasons. Measurements of twelve chemical and physical variables and phytoplankton collections were carried out at eight sampling stations. The Chlorophyceae and Cyanobacteria groups were in highest fractions during the rainy and dry seasons, respectively. The limnological abiotic variables showed a homogenous spatial distribution. The cluster analysis, using Bray-Curtis distance, distinguished two major groups, represented by the most common and abundant species in both the periods. The results showed that the climate regime, due to the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Seasonality; Phytoplankton; Diversity; Tropical region.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132003000400019

Offshore distribution patterns of the cyanobacterium Trichodesmium erythraeum ehrenberg and associated phyto- and bacterioplankton in the southern Atlantic coast (Paraná, Brazil)
Provedor de dados: 52
Autores: Siqueira,Adriana; Kolm,Hedda Elisabeth; Brandini,Frederico Pereira.
Studies were carried out on Thrichodesmium erythraeum occurring on the inner shelf in the state of Paraná, Brazil. Temperature, salinity, rainfall, wind velocity, total bacteria, bacterial biomass, chlorophyll-a, phytoplankton, Anabaena sp., Merismopedia sp. and T. erythraeum densities were measured in surface water. Centric and pennate diatoms, Anabaena sp. and Merismopedia sp. were most abundant at 15 m isobath, while dinoflagellate abundance was relatively constant among stations. Similarly, total bacterial densities were relatively homogeneous throughout the sampling area, suggesting that blooms of T. erythraeum were not yet in the senescent phase. Results showed that T. erythraeum was capable of surviving in relatively inhospitable environmental...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Trichodesmium erythraeum; Bloom; Cyanobacteria; Phytoplankton; South Brazil.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132006000300018

Impacts of the construction of the Port of Suape on phytoplankton in the Ipojuca River estuary (Pernambuco-Brazil)
Provedor de dados: 52
Autores: Koening,Maria Luise; Leça,Enide Eskinazi; Neumann-Leitão,Sigrid; Macêdo,Silvio José de.
In order to address the impact on phytoplankton, sampling was conducted monthly at 4 fixed stations, from April/86 to March/87 at diurnal low and high tide using a plankton net (65 mum mesh size) and a 1 L Van Dorn bottle. Among the 133 taxa identified, marine littoral euryhaline species were most common, outranking Gyrosigma balticum (Ehrenberg) Rabenhorst, Nitzschia sigma (Kützing) Wm. Smith, Licmophora abbreviata Agardh, Climacosphenia moniligera Ehrenberg, Surirella febigerii Lewis, Terpsinoe musica Ehrenberg and Cylindrotheca closterium (Ehrenberg) Reiman and Lewis. The port construction caused significant changes to the phytoplankton community with a strong influence of marine species (mainly dinoflagellate) because of the opening of the reef near...
Tipo: Info:eu-repo/semantics/report
Palavras-chave: Phytoplankton; Environmental impacts; Estuary; Suape Port.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132003000100012

Structure and dynamics of phytoplankton community in the Botafogo reservoir-Pernambuco-Brazil
Provedor de dados: 52
Autores: Lira,Giulliari Alan da Silva Tavares de; Bittencourt-Oliveira,Maria do Carmo; Moura,Ariadne do Nascimento.
The aim of the present study was to investigate the structure and dynamics of the phytoplankton in the Botafogo reservoir-PE-Brazil. Phytoplankton assemblages were identified from current literature and density was estimated using an inverted microscope. Concurrently to the sampling of biotic variables, measurements of abiotic parameters, such as water temperature, dissolved oxygen and pH, were determined using field probes and transparency was determined with a Secchi disk. Total phosphorus and total nitrogen concentrations were determined in laboratory. A total of 24 taxa were identified. Chlorophyta presented the greatest number of species. Species diversity in the reservoir was low throughout the study period. Principal component analysis revealed that...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Structure; Tropical reservoir; Phytoplankton; Brazil.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132009000200029

Structure of the phytoplankton in a water supply system in the State of Pernambuco - Brazil
Provedor de dados: 52
Autores: Moura,Ariadne do Nascimento; Dantas,Ênio Wocyli; Bittencourt-Oliveira,Maria do Carmo.
The aim of this work was to study the phytoplankton community composition at limnetic environment in Pernambuco, Brazil. Samplings were carried out from April/2001 to March/2002. Samples to analyses the biotic variables were taken using a recipient with a large overture, at the subsurface and with a Van Dorn bottle at the bottom. The rainfall data were recorded and the water transparency was used to calculate the light attenuation coefficient, photic zone and the determination of trophic state index. The concentrations of total phosphorus and total nitrogen were determined in a typical dry and rainy month. Equitability, also the, similarity and diversity indexes and the densities and correlation of total densities among depths were calculated. Forty-five...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Structure; Phytoplankton; Water supply system; Brazil.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132007000400010

Bacteria and phytoplankton production rates in eight river stretches of the middle Rio Doce hidrographic basin (southeast Brazil)
Provedor de dados: 52
Autores: Petrucio,Mauricio Mello; Barbosa,Francisco Antônio R.; Thomaz,Sidinei Magela.
Measurements of bacterial secondary production (BSP), together with primary phytoplanktonic production (PPP) were conducted during dry and rainy seasons, in eight rivers of different orders submitted to different degrees of human impacts (different trophic degree). We aimed to determine and compare the importance of BSP and PPP in carbon fixation in these different lotic ecosystems. Our results showed that the Ipanema River was the most modified system by anthropogenic effluents inputs. These inputs altered the trophic degree and BSP rates of these streams and rivers.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bacterioplankton; Carbon; Phytoplankton; Rivers; Trophic state.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132005000300019

Variaciones espaciales y temporales del fitoplancton en un lago subtropical de Argentina
Provedor de dados: 57
Autores: ZALOCAR DE DOMITROVIC,YOLANDA; ASSELBORN,VIVIANA M.; CASCO,SYLVINA L.
Species composition, biomass and diversity of the phytoplankton in a subtropical lake (27°29'S; 58°45'W) were studied from February 1995 to March 1996. One or two samples were taken monthly in the limnetic and the littoral area. Cell counts were done by the Utermöhl method (1958). Phytoplankton biomass varied among 2.38 and 45.59 mm³.m-2 with a mean value of 12.11 (±10.52) mm³.m-2. The population density oscillated among 0.3x10(6) and 4.7x10(6) ind.cm-2. Cyanophyta was the dominant group all the year contributing among 25% and 83% of the total biomass. Cylindrospermopsis raciborskii, Aphanizomenon sp. and Microcystis aeruginosa were the dominant species. The Chlorophyta, second group in importance, contributed among 8% and 50% being Botryococcus braunii...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Subtropical lake; Phytoplankton; Composition; Biomass; Diversity.
Ano: 1998
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71081998000300003

Photosynthetic capacity of three phytoplanktonic species measured by a pulse amplitude fluorometric method
Provedor de dados: 61
Autores: Figueredo,Cleber Cunha; Giani,Alessandra; Lemos Filho,José Pires.
During photosynthesis, absorbed energy that is not used in photochemical reactions dissipates as fluorescence. Fluorescence provides important information on the physiological conditions of the studied organisms and its measurement is widely used by plant physiologists and can be valuable in phytoplankton studies. We describe a method adapting a plant fluorometric equipment to measure the photosynthetic capacity of microalgae. Unialgal cultures of three planktonic chlorophytes were exposed to 3(3,4-dichlorophenyl)-1,1-dimethylurea (DCMU), an inhibitor of photosystem II, at concentrations of 0.1, 1.0 and 10.0 µmol.L-1. Estimates were made of photosynthetic parameters, including operational and potential photosystem II quantum yield and electron transport...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Chlorophytes photosynthesis; Electron Transport Rate; Phytoplankton.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202009000300001