Consulta: subjectFacets:"Macroalgae"
Registros recuperados: 37
Data/hora: 06/06/2024 10:56:12

Natural Geography in Nearshore areas (NaGISA): The Nearshore component of the Census of Marine Life
Provedor de dados: 72
Autores: Iken,Katrin; Konar,Brenda.
The Natural Geography in Shore Areas (NaGISA, the Japanese word for beach) project is the nearshore component of the Census of Marine Life program. NaGISA targets nearshore marine biodiversity in large macrophyte communities (hard bottom macroalgal communities and soft sediment sea grass beds) in a depth zonation from high intertidal to 15 m water depth. The overall goal of NaGISA is to quantify nearshore biodiversity on a global scale by conducting a longitudinal and latitudinal gradient. Outreach to the public, involvement of local communities in the sampling, and education are important components of the NaGISA program.
Tipo: Journal article
Palavras-chave: Biodiversity of beaches; Hard bottoms; Macroalgae; Sea grasses.
Ano: 2003
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382003000200004

ЭКОЛОГО-ФИТОЦЕНОТИЧЕСКИЕ ОСОБЕННОСТИ ПРОИЗРАСТАНИЯ ВИДОВ РОДА ГРАЦИЛЯРИЯ (ОБЗОР)
Provedor de dados: 13
Autores: Миронова, Н. В.
Описаны фитоценозы с участием прикрепленных и неприкрепленных форм Gracilaria gracilis и G.dura в прибрежной зоне Чёрного моря (Севастопольское взморье и б.Новороссийская). Определены районы в Мировом океане, где G. gracilis доминирует по биомассе в составе донной растительности. http://biotex.ibss.org.ua/
Tipo: Journal Contribution
Palavras-chave: Макрофиты; Грацилярия; Фитоценозы; Биомасса; Макрофіти; Грацилярія; Фітоценози; Біомаса; Macroalgae; Gracilaria; Phytocenoses; Biomass.
Ano: 2010
URL: http://repository.ibss.org.ua/dspace/handle/99011/1876

Каталазная активность массовых видов черноморских макроводорослей в градиенте хозяйственно-бытового загрязнения
Provedor de dados: 13
Autores: Мильчакова, Н. А.; Шахматова, О. А.
Представлены результаты исследования активности каталазы 18 массовых видов зелёных, бурых и красных черноморских макроводорослей. Выявлена их реакция на интенсивность хозяйственно-бытового загрязнения. Анализ изменения активности каталазы в градиенте от слабо- к сильнозагрязнённым акваториям показал, что максимальный отклик характерен для красных водорослей, средний – зелёных, реакция бурых была минимальна. Проведено ранжирование макроводорослей разных отделов по степени отклика их антиоксидантной системы на хозяйственно-бытовое загрязнение; выявлены таксоны, у которых он наиболее высок. К видам-индикаторам отнесены красные водоросли Callithamnion corymbosum, Laurencia coronopus и Gelidium spinosum. Обнаружено повышение исследуемого показателя...
Tipo: Journal Contribution
Palavras-chave: Макроводоросли; Каталазная активность; Хозяйственно-бытовое загрязнение; Метаболические стратегии; Чёрное море; Macroalgae; Catalase activity; Sewage pollution; Metabolic strategy; Black Sea.
Ano: 2007
URL: http://repository.ibss.org.ua/dspace/handle/99011/299

Suivi DCE 2017 « macroalgues subtidales » dans la masse d’eau « côte basque » et « macroalgues intertidales » dans la masse d’eau de transition « Adour aval ».
Provedor de dados: 5
Autores: De Casamajor, Marie-noelle; Lissardy, Muriel; Sanchez, Florence; Saguet, Cassandre.
This report describe sampling campaign 2017 related to data collection for WFD macroalgae indicators. The parameters concerned are "subtidal macroalgae" for coastal water body “Basque coast” and “intertidal macroalgae” for the transition water body “Adour aval”. The data treatment and the indicator calculation will be done in a second step.
Tipo: Text
Palavras-chave: Indicateur DCE; Masse d’eau; Macroalgue; Subtidal; Intertidal; Indicator WDF; Water body; Macroalgae; Subtidal; Intertidal.
Ano: 2017
URL: http://archimer.ifremer.fr/doc/00410/52177/53094.pdf

Évaluation du descripteur 5 « Eutrophisation » en France métropolitaine. Rapport scientifique pour l’évaluation 2018 au titre de la DCSMM
Provedor de dados: 5
Autores: Devreker, David; Lefebvre, Alain.
This report is the second assessment of French marine water eutrophication status (descriptor 5) done in the framework of the MSFD. The goal of this report is to determine if French marine water reach the Good Ecological State as defined by the MSFD. It stands next to the initial evaluation made in 2012, from which it is an update. It introduces the second cycle of the Marine Environment Action Program. It shows that French marine waters, behind the 12 nm line, reach the GES as defined by the MSFD. Problems link to eutrophication occurs in marine waters above the 12 nm, where 6.5% of the area do not reach the GES.
Tipo: Text
Palavras-chave: DCSMM; Eutrophisation; Évaluation; Bon Etat Ecologique; Seuils; Indicateurs; Nutriments; Chlorophylle-a; Oxygène; Turbidité; Macroalgues; Pressions écologiques; MSFD; Eutrophication; Assessment; Good Environmental Status; Thresholds; Indicators; Nutrients; Chlorophyll-a; Oxygen; Turbidity; Macroalgae; Ecological pressures.
Ano: 2018
URL: http://archimer.ifremer.fr/doc/00437/54868/56361.pdf

Suivi DCE du paramètre « macroalgues subtidales » dans la masse d’eau « côte basque »
Provedor de dados: 5
Autores: De Casamajor, Marie-noelle; Lissardy, Muriel.
Since 2008, the parameter “macroalgae subtidales” is calculated on 3 stations of the water mass FRFC11 Basque coast. In the second cycle of WDF monitoring, complementary metrics are calculated as for the entire Channel / Atlantic facade. These metrics were measured for the second time in 2017 and aim to optimize the information collected to assess the ecological status of water bodies but also to characterize the functionality of the ecosystem. The calculation of the Ecological Quality Ratio (EQR) makes it possible to classify this water mass in “Good” as the previous campaigns with a tendency to improve the rating during the whole period.
Tipo: Text
Palavras-chave: Indicateur DCE; Masse d’eau « côte basque »; Macroalgue; Subtidal; Qualité écologique; Indicator WDF; Water body “basque coast”; Macroalgae; Subtidal; Ecological quality.
Ano: 2018
URL: http://archimer.ifremer.fr/doc/00420/53134/54093.pdf

Impacts of green tides on estuarine fish assemblages
Provedor de dados: 5
Autores: Paumier, A.; Tatlian, T.; Reveillac, E.; Le Luherne, Emilie; Ballu, S.; Lepage, M.; Le Pape, Olivier.
All around the world, an increasing proportion of estuarine systems are facing massive proliferations of green macroalgae, called green tides, in response to nutrient enrichment. The consequences of this perturbation for ichthyofauna that use estuarine systems as essential fish habitats remain understudied. To estimate these consequences, we combined outputs of both macroalgae proliferation and fish community surveys conducted for the European Water Framework Directive in thirteen estuaries in northwestern France, a region where green tides are of great concern. The approach revealed the influence of green tides on estuarine fish communities. The response of each community to the green tides differed according to their functional guild composition. Benthic...
Tipo: Text
Palavras-chave: Fish community; Estuarine ecology; Green tides; Macroalgae; Nursery.
Ano: 2018
URL: https://archimer.ifremer.fr/doc/00465/57704/64188.pdf

Glycoglycerolipids From Sargassum vulgare as Potential Antifouling Agents
Provedor de dados: 5
Autores: Plouguerné, Erwan; De Souza, Lauro M.; Sassaki, Guilherme L.; Hellio, Claire; Trepos, Rozenn; Da Gama, Bernardo A. P.; Pereira, Renato Crespo; Barreto-bergter, Eliana.
Unraveling new environmentally friendly antifouling (AF) agents is one of the major quests currently facing marine biotechnology. Marine macroalgae represent a rich source of new compounds with promising biological properties, including AF activity, but most of the macroalgal compounds studied to date are terpenoids or polyphenolics. The aim of this work was to investigate the possible AF role played by a usually neglected class of marine natural products: glycolipids (monogalactosyldiacylglycerols – MGDG, digalactosyldiacylglycerols – DGDG and sulfoquinovosyldiacylglycerols – SQDG) isolated from the Phaeophyceae Sargassum vulgare collected along the coast of south-eastern Brazil. Among the 18 extracts, fractions and sub-fractions tested, 3 sub-fractions...
Tipo: Text
Palavras-chave: Sargassum vulgare; Glycoglycerolipids; Antifouling; Microfouling; Macroalgae.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00618/73053/72168.pdf

High rate algal pond treatment for water reuse in a marine fish recirculation system: Water purification and fish health
Provedor de dados: 5
Autores: Metaxa, Elisabeta; Deviller, Genevieve; Pagand, P; Alliaume, C; Casellas, C; Blancheton, Jean-paul.
Regardless of the degree of closure of a recirculation system, effluents are produced and replacement water is needed, which limits the possibility of locating a seawater production system away from the shoreline. At the Palavas Ifremer station, in the south of France, a High Rate Algal Pond (HRAP) was operated during several years to treat the effluent from a recirculating aquaculture system before reusing it. The effect of the HRAP-treated water on the recirculation system and on the fish was investigated and the optimal algae growing conditions were defined. The experiments were carried out in three rearing systems: one flow through, one recirculating and one recirculating with a HRAP. The water flow rate, temperature, pH and salinity conditions were...
Tipo: Text
Palavras-chave: Fish health; High rate algal pond; Macroalgae; Aquaculture effluent; Recirculation aquaculture systems.
Ano: 2006
URL: http://archimer.ifremer.fr/doc/2006/publication-2306.pdf

Macrophytobenthos des platiers rocheux intertidaux et semi-exposés da la région de Safi-Essaouira (Maroc occidental)
Provedor de dados: 5
Autores: Birje, J; Verlaque, M; Poydenot, F.
In 1990, a study of the phytobenthos of the rocky intertidal platforms in the Safi-Essaouira region (Sidi Boulbra, Western Morocco) was carried out at three sites. The intertidal zonation was analysed along permanent transects, and a qualitative and quantitative study of two characteristic units of the eulittoral vegetation - the vegetation belt of Fucus spiralis and the communities of Florideophyceae - was made. One hundred and twenty-nine macroalgal taxa and three phases were listed: 19 Ulvophyceae, 19 Fucophyceae, 1 Bangiophyceae and 93 Florideophyceae. The intertidal communities of the area are typical of semi-exposed and unpolluted platforms of Western Morocco, in the eulittoral zone, most of the typical Fucales that occur along the NE Atlantic coasts...
Tipo: Text
Palavras-chave: Macroalgae; Phytosociology; Intertidal zone; Western Morocco; Atlantic.
Ano: 1996
URL: http://archimer.ifremer.fr/doc/00096/20726/18363.pdf

Impact of macroalgal dredging on dystrophic crises and phototrophic bacterial blooms (red waters) in a brackish coastal lagoon
Provedor de dados: 5
Autores: Guyoneaud, R; De Wit, R; Matheron, R; Caumette, P.
The Prevost lagoon (Mediterranean coast, France), was subject to annual dystrophic crises caused by the biodegradation of opportunistic macroalgae (Ulva lactuca) in the past. These crises result in anoxic waters with subsequent blooms of Purple Sulphur Bacteria (red waters) which, by oxidizing sulphide, contribute to the reestablishment of oxic conditions in the water column. Mechanical dredging of the macroalgal biomass has been carried out in the lagoon since 1991 with the aim of preventing the ecological and economic disturbances caused by such crises. Dredging began just before the phototrophic bloom when the water was already hypoxic (O-2 = 0.7 mg . L-1) and contained sulphilde (H2S = 7.3 mg . L-1) and purple patches of phototrophic bacteria...
Tipo: Text
Palavras-chave: Milieu lagunaire; Macroalgues; Crise dystophique; Eaux rouges; Bactéries phototrophes; Lagoons; Macroalgae; Dystrophic crisis; Red waters; Phototrophic bacteria.
Ano: 1998
URL: http://archimer.ifremer.fr/doc/00325/43658/43216.pdf

Suivi DCE du paramètre "macroalgues subtidales" dans la masse d'eau "côte basque"
Provedor de dados: 5
Autores: De Casamajor, Marie-noelle; Lissardy, Muriel; Popovsky, Josiane; Soulier, Laurent.
In 2014, under the second cycle of WFD monitoring the "subtidal macroalgae" parameter is calculated on 3 stations of the “Basque coast” water body. Complementary metric have been obtained for the first time, as for all the Channel / Atlantic coast. Their aim is to optimize the information collected to assess the ecological status of water bodies. The calculation of the Ecological Quality Ratio (EQR) classify this water body as "Good" as in 2013 with a tendency to improve notation.
Tipo: Text
Palavras-chave: Indicateur DCE; Masse d’eau côte basque; Macroalgue; Subtidal; Qualité écologique; Indicator WDF; Water body; Basque coast; Macroalgae; Subtidal; Ecological quality.
Ano: 2015
URL: http://archimer.ifremer.fr/doc/00283/39432/37877.pdf

Suivi DCE du paramètre « macroalgues subtidales ». Masse d’eau FRFC11 côte basque - 2013
Provedor de dados: 5
Autores: De Casamajor, Marie-noelle; Popovsky, Josiane; Lissardy, Muriel.
In 2013, under the WFD monitoring the "subtidal macroalgae" parameter is calculated on 3 stations of the “Basque coast” water body. The classification for this parameter is "good", and scores obtained are higher than the previous years. This observation is mainly based on the fact that deeper bathymetric levels were sampled and allowed to better characterize belts and associated communities. The effects of bad spring weather conditions on algae growth are not visible at the time of sampling. After these first three sampling campains improvements and additions to the protocol are proposed to provide information for European directives.
Tipo: Text
Palavras-chave: Indicator WDF; Water body; Basque coast; Macroalgae; Subtidal; Ecological quality.
Ano: 2014
URL: http://archimer.ifremer.fr/doc/00176/28676/27114.pdf

Limited interspecific variation in grazing susceptibility of the brown alga Lobophora to herbivory
Provedor de dados: 5
Autores: Vieira, Christophe; Stenger, Pierre-louis; Moleana, Thibaud; De Clerck, Olivier; Payri, Claude.
The genus Lobophora is a notable benthic algal component of tropical coral reefs, capable of dominating large reef areas following coral mortality and herbivory declines. The alga, however, has been the object of contradictory observations in terms of susceptibility to herbivory. Unaware of the species-richness of this genus, most studies referred to Lobophora variegata, a species assumed to present various morphotypes and chemotypes, occupying diverse ecological niches. Variation in susceptibility to herbivory has been consequently interpreted as intraspecific variation in terms of morphology and chemical composition as well as differences in herbivore guild compositions and diet across different locations (e.g., habitat, reef, region). Recent taxonomic...
Tipo: Text
Palavras-chave: Defense; Escape; Herbivory; Lobophora; Macroalgae.
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00503/61491/67518.pdf

Relationship between land-use in the agro-forestry system of les Landes, nitrogen loading to and risk of macro-algal blooming in the Bassin d'Arcachon coastal lagoon (SW France)
Provedor de dados: 5
Autores: De Wit, Rutger; Leibreich, J; Vernier, F; Delmas, F; Beuffe, H; Maison, P; Chossat, J; Laplace Treyture, C; Laplana, R; Clave, V; Torre, M; Auby, Isabelle; Trut, Gilles; Maurer, Daniele; Capdeville, P.
Nitrogen loading to the Bassin d'Arcachon coastal lagoon (SW France) was evaluated by studying land-use and nitrogen output in its 3001 km(2) catchment. At present, the catchment is dominated by forestry (79%), while intensive agriculture occupies 9% of the surface. The N-output of two hydrological subunits, i.e. the Tagon subunit dominated by pine forestry and the Arriou 11 subunit comprising both forestry and intensive agriculture, were monitored for a seven year period (1996-2002). From these observations it was calculated that forestry contributes on average 1.6 kg total N ha(-1) yr(-1), which is dominated by organic nitrogen (DON+PON are 70% of N). On an areal basis, intensive agriculture contributes 26 times more than forestry, i.e. 41.6 kg total N...
Tipo: Text
Palavras-chave: Macroalgae; Seagrasses; Nitrogen loading; Catchment.
Ano: 2005
URL: http://archimer.ifremer.fr/doc/2005/publication-757.pdf

Seasonal and algal diet-driven patterns of the digestive microbiota of the European abalone Haliotis tuberculata, a generalist marine herbivore
Provedor de dados: 5
Autores: Gobet, Angelique; Mest, Laetitia; Perennou, Morgan; Dittami, Simon M.; Caralp, Claire; Coulombet, Celine; Huchette, Sylvain; Roussel, Sabine; Michel, Gurvan; Leblanc, Catherine.
Background: Holobionts have a digestive microbiota with catabolic abilities allowing the degradation of complex dietary compounds for the host. In terrestrial herbivores, the digestive microbiota is known to degrade complex polysaccharides from land plants while in marine herbivores, the digestive microbiota is poorly characterized. Most of the latter are generalists and consume red, green, and brown macroalgae, three distinct lineages characterized by a specific composition in complex polysaccharides, which represent half of their biomass. Subsequently, each macroalga features a specific epiphytic microbiota, and the digestive microbiota of marine herbivores is expected to vary with a monospecific algal diet. We investigated the effect of four...
Tipo: Text
Palavras-chave: Microbe-host interactions; Digestive microbiota; Abalone; Macroalgae; Holobiont.
Ano: 2018
URL: https://archimer.ifremer.fr/doc/00489/60071/63368.pdf

Screening of marine algal extracts for anti-settlement activities against microalgae and macroalgae
Provedor de dados: 5
Autores: Hellio, Claire; Berge, Jean-pascal; Beaupoil, Claude; Le Gal, Yves; Bourgougnon, Nathalie.
The ban on the use of TBT-based antifouling paints for boats under 25 m in length has lead to a search for new non-toxic antifoulants. One of the most promising alternative technologies to heavy metal based antifouling paint is the development of antifouling coatings whose active ingredients are naturally occurring compounds from marine organisms. This is based on the principle that marine organisms are also facing the problem of the presence of epibionts on their own surface. In this study, the antifouling activity of a series of aqueous, ethanolic and dichloromethane extracts from 30 algae from the North East Atlantic coast was investigated. The extracts were tested in laboratory assays against species representatives of two major groups of fouling...
Tipo: Text
Palavras-chave: Antifouling; Antialgal; Microalgae; Macroalgae; Screening; Settlement; Spores.
Ano: 2002
URL: https://archimer.ifremer.fr/doc/00057/16795/14304.pdf

Agrégation des sous-éléments de qualité de l’élément de qualité « Flore autre que phytoplancton »
Provedor de dados: 5
Autores: Miossec, Laurence.
The Water Framework Directive uses the “One-out, all-out” (OAOO) principle in assessing water bodies (i.e. the worst status of the elements used in the assessment determines the final status of the water body). Combination of multiple parameters within a biological quality element (BQEs) can be done in different ways. This study analysed several aggregation conditions within the BQE "Flora other than phytoplankton" (intertidal macroalgae, subtidal macroalgae, eelgrass beds and opportunistic blooms) using monitoring data collected along the Channel and Atlantic coastline.  Four aggregation criteria were tested on two sets of data collected between 2004 and 2014: OOAO, average, intermediate method between OOAO and average and a method taking into account an...
Tipo: Text
Palavras-chave: Macroalgues; Blooms opportunistes; Herbiers; Manche Atlantique; Méthodes d’agrégation; Macroalgae; Eelgrass beds; Opportunistic blooms; Channel and Atlantic coastline; Aggregation rules.
Ano: 2016
URL: http://archimer.ifremer.fr/doc/00348/45869/45568.pdf

Macroalgal population and sustainability
Provedor de dados: 5
Autores: Morand, Philippe; Merceron, Michel.
Algal blooms, often associated with eutrophication, are common in temperate regions in coastal lagoons and estuarine areas as well as in open seas. However, because of recent changes in water flows and sediment and nutrient loads in most rivers, eutrophication phenomena are now occurring in areas previously non affected. One of its most widespread and easily recognized effects in a coastal marine ecosystem is the excessive growths and drifts of macroalgae, to such a degree that the biomass becomes a significant problem.   The nutrients, notably from anthropogenic origin, constitute a significant factor in the appearance of the blooms in coastal waters. Besides a background originating from natural areas and precipitations, nutrients come from agriculture,...
Tipo: Text
Palavras-chave: Green tides; Macroalgae; Eutrophication; Nutrients; Black Sea.
Ano: 2005
URL: http://archimer.ifremer.fr/doc/2005/publication-2131.pdf

Nuevos registros para la flora marina bentónica cubana
Provedor de dados: 20
Autores: Alfonso Sánchez, Yusimí; Martínez-Daranas, Beatriz; Suárez Alfonso, Ana M.
Basado en material de herbario de las colecciones de macroalgas depositadas en el Acuario Nacional, Instituto de Ecología y Sistemática y Centro de Investigaciones Marinas, se comunica el hallazgo de dos nuevos registros para la flora marina bentónica de Cuba: Un alga roja, Dichotomaria obtusata var. major (W. R. Taylor) Wynne y un alga parda Sporochnus pedunculatus ( Hudson) C. Agardh. Adicionalmente se añaden nuevos datos de las especies Chrysymenia enteromorpha Harvey y Cladophora sericea (Hudson)        Kützing.
Tipo: Journal Contribution
Palavras-chave: Cuba; Macroalgae; New records.
Ano: 2014
URL: http://hdl.handle.net/1834/5914

The Genus Herposiphonia (Ceramiales, Rhodophyta) in the Coral Reefs Environmental Protection Area, Northeastern Brazil, with new records for Brazil and the Atlantic Ocean
Provedor de dados: 88
Autores: Silva,Ingrid Balesteros; Fujii,Mutue Toyota.
This paper presents a taxonomic study of taxa of the red algae genus Herposiphonia (Ceramiales) occurring on Maracajaú Reef in the Coral Reefs Environmental Protection Area (CREPA - Área de Proteção Ambiental dos Recifes de Corais) in Rio Grande do Norte State, along the northeastern coast of Brazil. The CREPA comprises coastline and continental shelf areas of the municipalities of Touros, Rio do Fogo, and Maxaranguape and includes sand dunes, coastal lagoons, and the adjacent shoreline and offshore reefs. Detailed morphological studies were made, considering recent taxonomic criteria for species delimitation of Herposiphonia, and five species were identified: H. delicatula, H. nuda, H. parca, H. secunda, and H. tenella, thus increasing the number of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Maracajaú Reef; Macroalgae; Morphology; Rio Grande do Norte; Taxonomy.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84042012000100011

Spatial variations at different observational scales and the seasonal distributions of stream macroalgae in a Brazilian subtropical region
Provedor de dados: 88
Autores: Krupek,Rogério Antonio; Branco,Ciro Cesar Zanini; Peres,Cleto Kaveski.
We examined the relationships between environmental variations in lotic ecosystems with the seasonal dynamics of macroalgae communities at different spatial scales: drainage basin of two rivers (Rio das Pedras and Rio Marrecas), shading (open and shaded stream segments), mesohabitat (riffles and pools), and microhabitats. Data collections were made on a monthly basis between January and December/2007. A total of 16 taxa were encountered (13 species and 3 vegetative groups). All of the biotic parameters (richness, abundance, diversity, equitability, and dominance) were found to be highly variable at all of the spatial scales evaluated. On the other hand, abiotic variables demonstrated differences only at mesohabitat (in terms of current velocity) and shaded...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Heterogeneity; Macroalgae; Seasonal variations; Stream.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84042012000300004

Effects of iron-ore particles on propagule release, growth and photosynthetic performance of Sargassum vulgare C. Agardh (Phaeophyta, Fucales)
Provedor de dados: 88
Autores: NASSAR,CRISTINA A.G.; LAVRADO,HELENA P.; YONESHIGUE-VALENTIN,YOCIE.
The effect of iron-ore particles on the propagule release and growth of Sargassum vulgare C. Agardh was tested under treatments with different concentrations of iron-ore particles: 0.1, 1.0, 10.0 g.L-1 and a solution of 10.0 g.L-1 of filtered iron-ore. Filtered seawater was used as control. Photosynthesis vs. irradiance (P-I) curves were calculated for S. vulgare in the presence of iron-ore and in seawater. There was no significant difference in the number of propagules released by the receptacles or in the percentage of zygote formation among the treatments. The released propagules acted like aggregation centers for the particles, those more heavily coated with iron (10.0 g.L-1) exhibiting the highest sinking velocity (32.6 ± 9.8 mm.s-1). No difference in...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Growth; Iron-ore; Macroalgae; Net photosynthesis; Sargassum vulgare.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84042002012000010

The succession dynamics of a macroalgal community after a flood disturbance in a tropical stream from São Paulo State, southeastern Brazil
Provedor de dados: 88
Autores: Branco,Ciro Cesar Z.; Branco,Luis Henrique Z.; Moura,Maurício Osvaldo; Bertusso,Fernando Rodrigo.
The succession dynamics of a macroalgal community in a tropical stream (20º58' S and 49º25' W) was investigated after disturbance by a sequence of intensive rains. High precipitation levels caused almost complete loss of the macroalgal community attached to the substratum and provided a strong pressure against its immediate re-establishment. After this disturbance, a weekly sampling program from May 1999 to January 2000 was established to investigate macroalgal recolonization. The community changed greatly throughout the succession process. The number of species varied from one to seven per sampling. Global abundance of macroalgal community did not reveal a consistent temporal pattern of variation. In early succession stages, the morphological form of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Disturbance; Macroalgae; Rainfall; Stream; Succession; Tropical.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84042005000200007

The genera Chara and Nitella (Chlorophyta, Characeae) in the subtropical Itaipu Reservoir, Brazil
Provedor de dados: 88
Autores: Meurer,Thamis; Bueno,Norma Catarina.
The family Characeae, represented by two genera in Brazil, Chara and Nitella, is considered to include the closest living relatives of land plants, and its members play important ecological role in aquatic ecosystems. The present taxonomic survey of Chara and Nitella was performed in tributaries that join to form the Brazilian shore of the Itaipu Reservoir on the Paraná River. Thirteen species were recorded, illustrated, and described: C. braunii var. brasiliensis R.Bicudo, C. guairensis R.Bicudo, N. acuminata A.Braun ex Wallman, N. furcata (Roxburgh ex Bruzileus) C.Agardh, and N. subglomerata A.Braun, already cited for the reservoir, and C. hydropitys Reichenbach, C. rusbyana Howe, N. axillaris A.Braun, N. glaziovii G.Zeller, N. gracilis (Smith) C.Agardh,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Charophyceae; Macroalgae; Submerged macrophyte; Taxonomy.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84042012000200009

Temporal dynamics of two species of Chaetophoraceae (Chlorophyta) in tropical streams of São Paulo State, Southeastern Brazil
Provedor de dados: 88
Autores: Branco,Ciro C.Z.; Necchi Junior,Orlando.
Temporal dynamics of the chaetophoracean green algae Chaetophora elegans (Roth) C.A. Agardh and Stigeoclonium amoenum Kützing populations was investigated biweekly during late autumn trhough early spring (April to October) in two tropical streams from northwestern São Paulo State, southeastern Brazil. Abundances of one population of each species was evaluated by the quadrat technique in terms of percent cover and frequency. The fluctuations were related to the following stream variables: temperature, turbidity, specific conductance, pH, oxygen saturation, depth, substratum type, current velocity, irradiance and nutrients. Percent cover and frequency of C. elegans had lower values throughout the study period and was positively correlated to rainfall. Other...
Tipo: Info:eu-repo/semantics/report
Palavras-chave: Chaetophora; Macroalgae; Stigeoclonium; Stream; Temporal dynamics.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84042003000200002

Ecological distribution of stream macroalgae in different spatial scales using taxonomic and morphological groups
Provedor de dados: 88
Autores: Krupek,Rogério Antonio; Branco,Ciro Cesar Zanini.
We examined the ecological distribution of macroalgal communities in streams using species groups (taxonomic units = algal phyla, and morphological = morphological types) with similar structures and functions instead of the species themselves. The study was conducted from June to July/2007 in two drainage basins located in mid-southern region of Paraná State , Brazil. Evaluations of macroalgal communities took into consideration the following spatial scales: the drainage basin (the Pedras river and Marrecas river basins), shading regime (open and shaded stream segments), mesohabitats (riffles and pools), and microhabitats (sampling units of 0.05m2). A total of 29 taxa (23 subgeneric, one generic, and five vegetative groups) were identified. On these, 12...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Distribution; Functional group; Macroalgae; Stream.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84042012000300006

Temporal and spatial variations in the structure of macroalgal communities associated with mangrove trees of Ilha do Cardoso, São Paulo state, Brazil
Provedor de dados: 88
Autores: YOKOYA,NAIR S.; PLASTINO,ESTELA M.; BRAGA,MARIA DO ROSÁRIO A.; FUJII,MUTUE T.; CORDEIRO-MARINO,MARILZA; ESTON,VERENA R.; HARARI,JOSEPH.
Temporal and spatial variations in species composition and vertical distribution of macroalgal communities growing on mangrove trees were analyzed bimonthly in the Ilha do Cardoso State Park, São Paulo state (25°03'S and 47°55'W), Southeastern Brazil. The macroalgal communities from mangroves of Perequê and Sítio Grande rivers comprised 10 and 18 taxa respectively. Bostrychia radicans (Mont.) Mont. and B. calliptera (Mont.) Mont. were the predominant taxa, present almost throughout the year and in all the sites studied. The species composition of macroalgal communities from both mangroves presented temporal and spatial variations related to environmental factors. The highest number of taxa was observed during colder, drier months, coinciding with the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ilha do Cardoso; Mangroves; Macroalgae; Vertical distribution.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84041999000200010

Laboratory experiments examining inducible defense show variable responses of temperate brown and red macroalgae
Provedor de dados: 97
Autores: ROTHÄUSLER,EVA; MACAYA,ERASMO C; MOLIS,MARKUS; WAHL,MARTIN; THIEL,MARTIN.
Macroalgae can defend themselves against generalist and specialist herbivores via morphological and/or chemical traits. Herein we examined the defensive responses (via relative palatability) of two brown (Lessonia nigrescens, Glossophora kunthii) and two red algae (Grateloupia doryphora, Chondracanthus chamissoi) from the northern-central coast of Chile against selected generalist meso-herbivores. Two laboratory experiments were conducted to investigate whether (i) algae can respond generally to grazing pressure of meso-herbivores (amphipods, isopods and juvenile sea urchins) and whether (ii) these algal responses were inducible. In order to examine palatability and thus effectiveness of responses, feeding assays were run after each experiment using fresh...
Tipo: Journal article
Palavras-chave: Palatability; Defense; Meso-herbivores; Macroalgae.
Ano: 2005
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2005000400001

Photosynthetic responses to UV-radiation of intertidal macroalgae from the Strait of Magellan (Chile)
Provedor de dados: 97
Autores: RAUTENBERGER,RALF; MANSILLA,ANDRÉS; GÓMEZ,IVÁN; WIENCKE,CHRISTIAN; BISCHOF,KAI.
For the first time, the photosynthetic performance of field-grown macroalgae from the Magellan Strait was evaluated with respect to their photoadaptation in the field and acclimation potential to ultraviolet radiation. Five macroalgal species were collected in the eulittoral and the upper sublittoral: Ulva intestinalis, Porphyra columbina, Adenocystis utricularis, Desmarestia confervoides and D. ligulata. Photosynthesis vs. irradiance (P-I) curves of macroalgae cultivated in the laboratory under low white light intensities more than a week were used to assess the acclimation potential to irradiance conditions in the field. Both, photosynthetic parameters referred to as maximum electron transport rate (ETRmax) and light saturation points of photosynthesis...
Tipo: Journal article
Palavras-chave: UV-radiation; Macroalgae; Photosynthesis; Photoacclimation; Strait of Magellan.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2009000100003

Influence of laboratory cultivation on species of Rhodophyta physiological evaluations and antifungal activity against phytopathogens
Provedor de dados: 124
Autores: Machado,Levi Pompermayer; Matsumoto,Silvia Tamie; Cuzzuol,Geraldo Rogério Faustini; Oliveira Jr,Luiz Fernando Ganassali.
The present study examined changes that took place in the physiology of three species of Rhodophyta by analysing the concentration of pigments and non-structural carbohydrates, comparatively evaluating algae collected from nature and after 28 days of laboratory cultivation. Another objective of the study was to determine whether the species retain their antifungal potential after the period of laboratory cultivation, correlating the changes in physiology and those from bioactivity. After carrying out laboratory cultivation, the results indicated a trend, in the three species of macroalgae, towards a reduction in pigment concentrations, mainly in the phycobiliproteins. For the non-structural carbohydrates no response pattern of the macroalgae was observed...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Plant physiology; Macroalgae; Nonstructural carbohydrates; Pigments.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902014000100007

SURVEY OF BENTHIC DINOFLAGELLATESASSOCIATED TO BEDS OF Thalassia testudinumIN SAN ANDRÉS ISLAND, SEAFLOWER BIOSPHERE RESERVE,CARIBBEAN COLOMBIA.
Provedor de dados: 37
Autores: RODRIGUEZ,E. ANGELICA; MANCERA PINEDA,J. ERNESTO; GAVIO,BRIGITTE.
In order to determine the occurrence of epiphytic toxic dinoflagellates in the coastal waters of San Andrés Island, Caribbean Colombia, we analyzed the seagrass beds on the northern and eastern sides of the island. We found seven species of toxicogenic dinoflagellates, belonging to the genera Prorocentrum and Ostreopsis. The cell densities were generally low if compared with previous studies in other Caribbean sites, ranging from 0 to 836 cells/dry weight. The species encountered are known to produce toxins causing the Diarrehic Shellfish Poisoning and Ciguatera, poisonings which have been documented in the island
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Epiphytes; Macroalgae; Ostreopsis; Prorocentrum; Toxic dinoflagellates.
Ano: 2010
URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0120-548X2010000200016

First molecular analysis of the genus Bryopsis (Bryopsidales, Chlorophyta) from Brazil, with an emphasis on the Pernambuco coast
Provedor de dados: 39
Autores: Oliveira,Marcella Guennes Tavares de; Pereira,Sonia Maria Barreto; Benko-Iseppon,Ana Maria; Balbino,Valdir Queiroz; Silva Junior,Wilson José da; Ximenes,Caroline Feijão; Carvalho,Maria de Fátima de Oliveira; Cassano,Valéria.
ABSTRACT The green algal genus Bryopsis has simple morphology and high phenotypic plasticity, making it difficult to identify its species based on morphological characteristics alone. This study evaluated the diversity of Bryopsis in northeastern Brazil (the State of Pernambuco), based on morphological and molecular data using the markers tufA and rbcL. Molecular analyses were incongruent with morphology, demonstrating the existence of cryptic and polymorphic species in the genus. Of the four taxa cited for the area based only on morphological data (Bryopsis corymbosa, B. pennata, B. plumosa, Bryopsis sp.), only B. pennata was recorded. Typical specimens of B. pennata and B. plumosa were grouped with low genetic divergence, 0-0.21 % for tufA and no...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bryopsis; CpDNA; Macroalgae; RbcL; Taxonomy; TufA.
Ano: 2021
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062021005002206

Descriptions of Cottoniella fusiformis, Branchioglossumcf. minutum and Frikkiella searlesii (Rhodophyta, Ceramiales) from the Brazilian continental shelf
Provedor de dados: 39
Autores: Oliveira,Vinícius Peruzzi de; Valentin,Yocie Yoneshigue.
The diversity and distribution of marine macroalgae along the Brazilian coast have been investigated in detail. However, information about the deep-water macroalgal flora remains scarce, available mostly in scattered publications or gray literature. In this context, the aim of this study was to describe three specimens of Rhodophyta (Cottoniella fusiformis, Frikkiella searlesii and Branchioglossum cf. minutum) collected in the deep waters of the continental shelf off the coast of the state of Espírito Santo during expeditions of the program Evaluating the Potential of Living Resources in the Exclusive Economic Zone. The morphology and distribution of the collected species are detailed, and the taxonomic and biogeographic implications are discussed.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Deep waters; Macroalgae; ReviZee; Taxonomy.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062014000400020

Short-term successional dynamics of a macroalgal community in a stream from northwestern São Paulo State, Brazil
Provedor de dados: 39
Autores: Borges,Fábio Renato; Necchi Júnior,Orlando.
This investigation aimed to describe a short term (70 days) ecological succession event of a macroalgal community in a stream from northwestern São Paulo state (20º43'S; 49º13'W) after artificial disturbance (removal); evaluate if community structure characteristics were similar before and after the experimental period; compare the successional process of two experimental stream segments (partly and completely disturbed segments, PDS and CDS, respectively), simulating medium (partial) and high impact (complete removal) disturbances. In terms of colonization time, Oedogonium sp. was classified as successionally indifferent, whereas Chaetophora elegans (Roth) C. Agarth and Batrachospermum delicatulum (Skuja) Necchi et Entwisle were classified as late...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Life strategy; Lotic ecosystem; Macroalgae; Succession.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062008000200014

Diversity Assessment of Lotic Macroalgal Flora by the Application of Taxonomic Distinctness Index
Provedor de dados: 49
Autores: Tonetto,Aurélio Fajar; Bispo,Pitágoras Conceição; Branco,Ciro Cesar Zanini.
The main aim of this study was to assess the diversity of four stream algal divisions (Cyanobacteria, Chlorophyta, Ochrophyta and Rhodophyta) by comparing results obtained with taxonomic distinctness index and diversity patterns of previous studies. The data were obtained from a study made in 1000 stream segments in North American biomes. The taxonomic arrangement of the taxa was created from species to division level in order to obtain the taxonomic tree, which is used in taxonomic distinctness index. The results of taxonomic distinctness index showed that stream macroalgal diversity was different from that commonly found. Herein, Ochrophyta was the division with the highest diversity, whereas in previous studies Chlorophyta has been in the first...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Biodiversity; Taxonomic distinctness; Macroalgae.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032016000100104

ENSAYOS DE ACTIVIDAD BIOLÓGICA Y ECOLOGÍA QUÍMICA DE EXTRACTOS ORGÁNICOS DE MACROALGAS DEL CARIBE COLOMBIANO
Provedor de dados: 50
Autores: Díaz R.,Martha Cecilia; Bula Meyer,German; Zea,Sven; Martínez,Alejandro.
This study evaluates the biological activity and possible deterrance played by organic crude extracts from six Phaeophyta and two Rhodophyta algae from Southern Caribbean. Bioessays were carried out using concentrations equivalent to those present in algae tissue. Species in general did not show high citotoxic activity. However Dictyota pulchella, showed a delay in the mitotic process for cells stage XVI. Extracts from Dictyota bartayresiana, D. pulchella, Sargassum cymosum and Cladophyllum schnetteri, inhibited S. partitus feeding under laboratory conditions. Nontheless, only extracts from D. bartayresiana and C. schnetteri showed this activity in the field.
Tipo: Info:eu-repo/semantics/report
Palavras-chave: Macroalgae; Colombian Caribbean; Chemical ecology; Biological activity.
Ano: 2006
URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0122-97612006000100015