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Registros recuperados: 71
Primeira ... 1234 ... Última
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20th century fluctuations in the abundance of siliceous microorganisms preserved in the sediments of the Puyuhuapi Channel (44° S), Chile RChHN
REBOLLEDO,LORENA; LANGE,CARINA B.; FIGUEROA,DANTE; PANTOJA,SILVIO; MUÑOZ,PRÁXEDES; CASTRO,RODRIGO.
We present a 100-year reconstruction of siliceous export production from sediments of the Puyuhuapi Channel (44° S, 70° W) in the Chilean fjords. We use accumulation rates and concentrations of diatoms and silicoflagellates, organic carbon (Corg) and biogenic opal (SiOPAL) as proxies of export production, and fluctuations in the contribution of freshwater diatoms as proxies of rainfall in the hinterland and river runoff. Box core sediments collected at two sites within the Puyuhuapi Channel were analyzed: Station 35 (at the head of the fjord; 56 m water depth) and Station 40 (in the middle of the Channel; 270 m water depth). Surface sedimentation rates were 0.75 cm yr-1 at Station 35 and 0.25 cm yr-1 at Station 40. SiOPAL content averaged ~ 4 % at both...
Tipo: Journal article Palavras-chave: Siliceous microorganisms; Diatoms; Sediments; Export production; Puyuhuapi Channel; Chilean fjords.
Ano: 2005 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2005000300009
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A model of nematode dynamics in the Westerschelde Estuary OMA
Li, J.; Vincx, M.; Herman, P.M.J..
We developed a time dynamic model to investigate the temporal dynamics of nematode community in the brackish zone of the Westerschelde Estuary. The biomass of four nematode feeding groups observed from March 1991 to February 1992 is used to calibrate the model. Using environmental data as the input, the model predicts the temporal modification and interrelation of four nematode feeding groups. Nematodes achieve a dominant position in the community because of their lower loss rate (in respiration, excretion and natural death). Predators which are deposit-feeding macrobenthos control the variations of dominant nematodes, such as omnivores and non-selective deposit feeders. Food availability causes modification only for rare nematodes such as epigrowth...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Diatoms; Ecology; Food; Light; Marine nematodes; Meiobenthos; Population dynamics; Predation; Respiration; Temperature; Nematoda [Nematodes].
Ano: 1996 URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=7284
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Actinella species (Bacillariophyta) from an Amazon black water floodplain lake (Amazonas - Brazil) Acta Amazonica
Melo,Sérgio; Torgan,Lezilda Carvalho; Raupp,Stela Valenti.
The genus Actinella Lewis was studied using planktonic samples from a black water floodplain lake in Central Amazon region. For species identification the taxa were morphological and morphometricaly analyzed on base in light microscope (LM) and scanning electronic microscope (SEM). Five species were registered: Actinella brasiliensis Grunow, A. guianensis Grunow, A. gracile Kociolek, A. mirabilis (Eulenstein ex Grunow) Grunow and A. robusta Hustedt. A. gracile is reported for the first time for Amazon State and black water systems and it is firstly documented with SEM. In addition, a review of geographic distribution of Actinella species in Brazilian Amazon region is given.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Actinella; Diatoms; Amazon; Black water; Floodplain lakes.
Ano: 2010 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0044-59672010000200004
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Adición a la microflora de diatomeas de las aguas marinas de Cuba. OceanDocs
Loza, S.; Sánchez, M.; Carmenate, M.; Siqueiros-Beltrones, D..
Se presenta la información sobre la especie de diatomea Campylostylus normannianus (Greville, 1862) Gerloff, Natour & Rivera, 1978 encontrada en la bahía de Jigüey y que no había sido identificada en los estudios taxonómicos de las microalgas de Cuba, por lo que se pudiera considerar una contribución a la diversidad de las microalgas marinas del país. Este es un taxon que crece en ambientes hipersalinos. Sin embargo, en este ecosistema se presenta acompañada de otros taxa de diatomeas, las que son abundantes y características de ecosistemas de manglar.
Tipo: Journal Contribution Palavras-chave: Diatoms; Diatoms; Http://aims.fao.org/aos/agrovoc/c_32657.
Ano: 2011 URL: http://hdl.handle.net/1834/4058
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Aspectos oceanográficos del plancton y su relación con el frente ecuatorial, durante septiembre del 2011 OceanDocs
Tapia, M.E.; Naranjo, Ch..
El presente trabajo comprende la composición y distribución del plancton en las Islas Galápagos. Para el efecto se establecieron 12 estaciones ubicadas en las secciones 83°- 86°-89° y 92°W, realizadas en septiembre del 2011. Se identificaron 71 especies de fitoplancton en muestras de red (50µ). Las diatomeas fueron dominantes y en menor concentración se observaron los Dinoflagelados, Cocolitofóridos, Silicoflagelados, Cianobacterias y Tintínnidos. En las muestras de red se observaron Chaetoceros eibenii, Rhizosolenia imbricata, Thalassiosira subtilis, Proboscia alata y Planktoniella sol características del Frente Ecuatorial en la sección 86°W y 02° sur. En zooplancton se registraron 17 taxa zooplanctónicas destacándose los grupos de Radiolarios 47.5%,...
Tipo: Journal Contribution Palavras-chave: Composition; Distribution; Plankton; Diatoms; Abundance; Cruises.
Ano: 2012 URL: http://hdl.handle.net/1834/4705
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Assessing Alternative Microscopy-Based Approaches to Species Abundance Description of Intertidal Diatom Communities ArchiMer
Ribeiro, Lourenço; Brotas, Vanda; Hernandez Farinas, Tania; Jesus, Bruno; Barille, Laurent.
Diatoms usually dominate microphytobenthic biofilms in coastal and estuarine intertidal environments. Yet, functional studies on biofilms often skip species analysis because benthic diatoms are notoriously difficult to extract from sediments and challenging to identify at that taxonomic level. Valid, less time-consuming alternatives would surely be welcomed and increase the inclusion of community structure information in microphytobenthos (MPB) ecophysiological studies. Starting with an original 181-species abundances matrix (OSM), obtained during a 2-year spatial–temporal survey in a Tagus Estuary intertidal flat with contrasting sediment textures, the current study assessed the effectiveness of several approaches to species abundances analysis. The...
Tipo: Text Palavras-chave: Diatoms; Community structure; Intertidal flats; Microphytobenthos; Multivariate analysis; Taxonomic sufficiency.
Ano: 2020 URL: https://archimer.ifremer.fr/doc/00610/72187/70963.pdf
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Atlas des Diatomophycées des côtes françaises et des aires marines adjacentes ArchiMer
Paulmier, Gerard.
This Atlas puts the list of main diatoms from phytoplanktonic collects carried out in the French waters and bordering marine areas. A simple key of genera is set up and listed species are illustrated by photographies obtained with light microscope, and by drawings.
Tipo: Text Palavras-chave: Iconographie list; Mediterranean See; Channel; Atlantic; French coasts; Diatoms; Liste iconographique; Méditerranée; Manche; Atlantique; Côtes françaises; Diatomées; Diatomophycées.
Ano: 1997 URL: http://archimer.ifremer.fr/doc/1997/rapport-2452.pdf
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BMAA et cyanotoxines : microalgues productrices et niveaux d’accumulation dans les organismes marins ArchiMer
Reveillon, Damien.
BMAA (â-N-methylamino-L-alanine) is a non proteinogenic neurotoxic amino acid that has been associated with amyotrophic lateral sclerosis. Its analytical detection is widely debated thus the global production of BMAA by cyanobacteria is questioned. We first aimed at developing an analytical method allowing for highly selective identification of BMAA and isomers, using HILIC chromatography coupled to mass spectrometry. Then, we have cultivated and analyzed more than 50 microalgae (e.g. cyanobacteria, diatoms). Unlike DAB, one of its natural isomer, BMAA was only reported in five diatom species and cannot be accounted as a cyanotoxin anymore. In parallel, we have evaluated the presence of BMAA on the three French coasts. The presence of BMAA in different...
Tipo: Text Palavras-chave: DAB; Cyanotoxines; CL-SM/SM; Diatomées; Cyanobactéries; Bivalves; BMAA; DAB; Cyanotoxins; LC-MS/MS; Diatoms; Cyanobacteria; Bivalves.
Ano: 2015 URL: http://archimer.ifremer.fr/doc/00295/40651/39617.pdf
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Caractéristiques physiques et chimiques fines des cendres volcaniques : application à la téphrostratigraphie ArchiMer
Jouannic, Gwénolé.
The challenge of this work was to carry out several tephrostratigraphic studies in various sedimentary environments in order to test the efficiency of classical detection methods of tephra layers. First, analysis has been focused on tephra keys, previously studied in known sites, in Belgium and in the Jura Mountains, in order to update data with current analytical techniques. This work was later expanded to sites from eastern French Massif Central, an area with unexploited tephrostratigraphic potential, which offers the possibility to precise the source of cryptotephras identified in the Jura and Switzerland whose origin was uncertain. This work has been carried out in tephras sampled in loess, carbonate maris and peat allowing to discuss conservation...
Tipo: Text Palavras-chave: Téphra; Jura; Massif Central; Belgique; Diatomées; Imagerie scanner; XRF; Susceptibilité magnétique; Pyroclastites -- Jura (massif); Pyroclastites; Pyroclastites -- Liège (Belgique; Région); Stratigraphie; Téphrochronologie; Tephra; French Massif Central; Belgium; Diatoms; CT Scan; Magnetic susceptibility.
Ano: 2015 URL: https://archimer.ifremer.fr/doc/00506/61720/65688.pdf
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Coastal phytoplankton community dynamics and coexistence driven by intragroup density-dependence, light and hydrodynamics ArchiMer
Barraquand, F.; Picoche, C.; Maurer, Daniele; Carassou, L.; Auby, Isabelle.
Phytoplanktonic communities maintain a high diversity in a seemingly homogeneous environment, competing for the same set of resources. Many theories have been proposed to explain this coexistence despite likely competition, such as contrasted responses to temporal environmental variation. However, theory has developed at a faster pace than empirical evaluation using field data, which requires inferring drivers of community dynamics from observational time series. Here, we combine autoregressive models with a data set spanning more than 20 years of phytoplankton counts every two weeks, together with nutrients and physical variables. By comparing models dominated by nutrients or physical variables (hydrodynamics and climate), we first explore which abiotic...
Tipo: Text Palavras-chave: Competition; Diatoms; Dinoflagellates; Hydrodynamics; Interactions; MAR; Mutualism; Network; Population dynamics; Seasonality; Time series.
Ano: 2018 URL: https://archimer.ifremer.fr/doc/00461/57257/59285.pdf
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Composición, distribución y abundancia del plancton en el estuario de San Lorenzo, Esmeraldas - Ecuador OceanDocs
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
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Composición y variación estacional del fitoplancton, zooplancton y microbentos en el estuario interior del Golfo de Guayaquil, durante el año 2003 OceanDocs
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
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Condiciones del plancton en una estación fija: Puerto El Morro-Playas, Golfo de Guayaquil, 2000-2002 OceanDocs
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
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Contribution aux recherches ecologiques sur les claires a huitres du bassin de Marennes-Oleron ArchiMer
Moreau, Jean.
Tipo: Text Palavras-chave: Ecology; Biology; Navicula ostrearia B.; Diatoms; Water quality; Oyster pond; Oyster culture.
Ano: 1970 URL: http://archimer.ifremer.fr/doc/1970/publication-2231.pdf
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Coscinodiscophyceae and Fragilariophyceae (Diatomeae) in the Iguaçu River, Paraná, Brazil Acta Botanica
Nardelli,Margaret Seghetto; Bueno,Norma Catarina; Ludwig,Thelma Alvim Veiga; Tremarin,Priscila Izabel; Bartozek,Elaine Cristina Rodrigues.
A taxonomic survey was carried out on Coscinodiscophyceae and Fragilariophyceae found in the Iguaçu River catchment area within Iguaçu National Park, in the state of Paraná, Brazil. Between September 2007 and August 2008, we collected 24 samples from two stations on the Iguaçu River, upstream and downstream of the falls. We identified 37 taxa, including 22 specific and infraspecific taxa of Coscinodiscophyceae, together with 15 specific and infraspecific taxa of Fragilariophyceae. Melosira ruttneri Hustedt and Fragilaria alpestris Krasske ex Hustedt represent new records for Brazil.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Diatoms; Lotic systems; Southern Brazil; Taxonomy.
Ano: 2014 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062014000100013
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Development of Sedimentary Environment in the Northeastern South China Sea Since the Last Glacial Stage. OceanDocs
Huangh, Yuanhui; Lan, Dongzhao.
Core D(21°23′02″N,116°47′13″E, water depth 405 m)was sampled from the upper slope from the northeastern South China Sea (SCS) and applied to analyze the sedimentary environmental change in this sea area since the last glacial stage. The results of grain size analysis, diatom analysis and detrital mineral analysis were well matched. We divided the core D into two layers. The surface sand layer (0 - 2 cm) consisted of residual sediments, which might be originally the sediment in the late Pleistocene and later suffered from being transformed in the post glacial transgression. The lower layer (2 - 130 cm) was quite different from the surface one, which might mainly result from a neritic sedimentary environment in the last glacial stage. Two sedimentary cycles...
Tipo: Journal Contribution Palavras-chave: Grain size; Diatoms; Sedimentary environments.
Ano: 2007 URL: http://hdl.handle.net/1834/5836
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Diagnóstico del plancton en el estuario de San Lorenzo en agosto 2006 (Esmeraldas-Ecuador) OceanDocs
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
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Diatom assemblage in a tropical lake of northeastern Brazil BABT
Nascimento,Lilian Rodrigues do; Sifeddine,Abdelfettah; Torgan,Lezilda Carvalho; Albuquerque,Ana Luiza Spadano.
The composition and spatial variation of diatom assemblage in surface sediments of Caçó Lake (shallow, mesotrophic and weakly acid lake - Maranhão State, Brazil) were analyzed in order to know the distribution pattern of the species along the lake during rainy season (April 1999). Four zones were established in the lake based on 21 diatoms species and habitat affinities. The first three zones (prime three meters deep to six meters deep) were marked by the occurrence of Pinnularia gigas, Frustulia rhomboides, Encyonopsis krasskei, Eunotia camelus, E. femoriformis and E. monodon. Zone IV (seven to nine meters deep) was inhabited mainly by Surirella biseriata and Fragilariforma floridana. During the beginning of the rainy season, the diatom assemblage in Caçó...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Diatoms; Shallow lake; Surface sediments; Caçó Lake; Brazil.
Ano: 2010 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132010000100030
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Diatom response to oceanographic and climatic changes in the Congo fan area, equatorial Atlantic Ocean, during the last 190ka BP ArchiMer
Hatin, T.; Crosta, X.; Le Herisse, A.; Droz, L.; Marsset, Tania.
Changes in siliceous productivity in the eastern Equatorial Atlantic Ocean, off the Western African margin, over the last several glacial cycles have been either related to global-to-regional oceanographic changes (upwelling intensity) or climate changes (precipitation and river discharge). Based on diatom assemblages in core KZAI-02, located to the south of the mouth of the Congo River, integrated with a selection of geochemical proxies, we show that siliceous productivity in the southeastern Angola Basin responded to non-linear interactions between both oceanographic and climate changes over the last 190,000 years. High diatom accumulation rates were recorded in the middle part of MIS 6, in cold substage MIS 5d and in MIS 3-2. During these intervals,...
Tipo: Text Palavras-chave: Diatoms; Productivity; Late quaternary; Millennial time scale; Congo fan area.
Ano: 2017 URL: https://archimer.ifremer.fr/doc/00363/47402/47394.pdf
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Diatomeas y silicoflagelados del fitoplancton del Golfo de Guayaquil: II edición OceanDocs
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
Registros recuperados: 71
Primeira ... 1234 ... Última
 

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