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Registros recuperados: 16
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Aspectos biológicos y ecológicos de los pelecípodos protobranquios integrantes de las comunidades bentónicas del Golfo San Jorge: Nuculana sulculata (Couthouy, 1852), Nucula puelcha d'Orbigny, 1842 y Malletia cumingii (Hanley, 1860) OceanDocs
Piñero, R.A..
La costa patagónica y en especial el golfo San Jorge (Mar Argentino, Atlántico sudoccidental), son zonas de gran interés pesquero, destacándose este último por poseer una de las especies de mayor valor comercial del Mar Argentino: el langostino patagónico Pleoticus muelleri. En un nuevo concepto de análisis integrado, se estudia la relación de los recursos con su ambiente. En el caso particular del langostino, dado su hábito bentónico, resulta de importancia acceder al conocimiento sobre las distintas especies que conforman las comunidades bentónicas y sus interrelaciones. El estudio de las comunidades bentónicas del Golfo San Jorge ha sido realizado por Roux et al. (1995, 1997) consistiendo principalmente en la confección de un amplio inventario...
Tipo: Theses and Dissertations Palavras-chave: Geographical distribution; Taxonomy; Benthos; Ecological associations; Abundance; Feeding behaviour.
Ano: 2001 URL: http://hdl.handle.net/1834/5031
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Bacteries associees aux production de Brachionus plicatilis ArchiMer
Nicolas, Jean-louis; Joubert, M.
Bacteria associated with semi-continuous culture of Brachionus plicatilis , which is used as the first food of marine fish larvae, were counted on Zobell 2216 E medium and identified. The numbers of bacteria were very high in both Brachionus (about 10 super(11) bact. per ml of digestive content) and in water (from 1.6.10 super(6) to 4.7.10 super(7) bact. per ml). The cultures were studied at driving a time when mortalities occurred frequently. The introduction of a Pseudomonas) phenon at a proportion of about 50% to the dominant microflora persisted in time and was little influenced by diet. It has been the cause of the repression of the Vibrio, Aeromonas group which was found in an unusually small proportion. It induced a lack of microflora diversity and...
Tipo: Text Palavras-chave: Brachionus plicatilis; Rotifera; Pseudomonas; Aeromonas; Vibrio; Nutrition; Pathology; Fish culture; Fish larvae; Food organisms; Bacteria; Continuous culture; Ecological associations; Zooplankton culture.
Ano: 1984 URL: http://archimer.ifremer.fr/doc/1984/acte-994.pdf
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Composición y estructura de la comunidad de octocorales en los Bajos de Sancho Pardo, arrecife de Los Colorados, Cuba OceanDocs
Pérez- Angulo, A.; Nuez-Hernández, D..
Se estudiaron la composición y estructura de las comunidades de octocorales en cinco sitios localizados en los Bajos de Sancho Pardo (arrecife de Los Colorados (NW Cuba)) en agosto del 2010. Se empleó como unidad de muestreo un marco cuadrado de un metro de lado. En total se estudiaron 11 zonas del arrecife frontal, dos zonas traseras y una cresta. Se identificaron 34 especies de gorgonias de 2687 colonias. En el arrecife frontal, Pseudopterogorgia americana y Pseudopterogorgia elisabethae fueron las especies dominantes, mientras que en la zona trasera lo hicieron Briareum asbestinum y Pseudopterogorgia bipinnata. En la cresta arrecifal predominaron Gorgonia ventalina y Plexaura homomalla. Se encontraron diferencias significativas (P = 0.05) para la...
Tipo: Journal Contribution Palavras-chave: Coral reefs; Ecological associations.
Ano: 2011 URL: http://hdl.handle.net/1834/4170
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Crustáceos Decápodos y Estomatópodos asociados a la pesquería del langostino patagónico Pleoticus muelleri (Bate, 1888) en el golfo San Jorge, Argentina OceanDocs
Roux, A.; Piñero, R..
The analysis of the data obtained in five research cruises carried out during the year 2000 allowed to describe the composition, structure and distribution of decapod and stomatopod crustaceans of the benthic communities of the San Jorge Gulf associated to Patagonian red shrimp fishing grounds. Results show that decapod and stomatopod crustaceans account for 71% of the total crustacean species registered in the benthic community. Munida subrugosa is the species that presents the highest values of relative abundance, frequency of occurrence and relative importance index. The feeding habits of Libidoclaea granaria, Lithodes santolla and Peltarion spinosulum and food availability in the San Jorge Gulf fishing grounds explain the high frequency of occurrence...
Tipo: Journal Contribution Palavras-chave: Fishing grounds; Marine crustaceans; Ecological associations; Abundance; Shrimp fisheries; Fishing grounds; Ecological associations; Http://aims.fao.org/aos/agrovoc/c_2947; Http://aims.fao.org/aos/agrovoc/c_32845.
Ano: 2006 URL: http://hdl.handle.net/1834/2514
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Determinisme du comportement associatif des poissons pelagiques: les hypotheses a l'epreuve des faits ArchiMer
Freon, Pierre; Dagorn, Loeiz.
No abstract.
Tipo: Text Palavras-chave: Attracting techniques; Behaviour; Ecological associations; Pelagic fisheries.
Ano: 2000 URL: http://archimer.ifremer.fr/doc/00042/15322/12661.pdf
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Efecto del alga invasora Undaria pinnatifida sobre la comunidad de peces de arrecife en los golfos Norpatagónicos OceanDocs
Irigoyen, A.J..
This study investigates the impact of Undaria pinnatifida on the reef fish assemblage associated with the coastal rocky reefs of Golfo Nuevo in northern Patagonia, Argentina. Undaria pinnatifida is a laminarian kelp, indigenous to the temperate regions of Japan, China and Korea. It has spread around the world by international shipping and has also been introduced in some regions for mariculture. Its expansion into the northern Patagonian gulfs and Peninsula Valdes, a UNESCO Natural Heritage Site, may threaten eco-tourism activities that depend on local biodiversity and the esthetic quality of the ecosystem. In particular, there is concern about the impact of Undaria on a variety of recreational activities including diving, angling and spear fishing, which...
Tipo: Theses and Dissertations Palavras-chave: Reef fish; Ecological associations; Introduced species; Habitat; Environmental impact; Environmental monitoring; Census; Undaria pinnatifida; Marine environment.
Ano: 2010 URL: http://hdl.handle.net/1834/4774
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El rol del frente de mareas de Península Valdés en el control de la comunidad zooplanctónica OceanDocs
Derisio, C..
The Península Valdés tidal front was studied in its rol in the control of the spatial distribution, abundance, assemblages, diversity and life histories of the zooplankton community using samples from two oceanographic surveys. Although the front showed in general high zooplankton abundances, highest values, mainly due to the presence of immature stages of copepods, were recorded in the transitional and stratified zones coinciding with highest values of chlorophyll a. The zooplankton groups showed a distinctive spatial distribution across the front. The results showed that this front did not exert any control on zooplankton composition and diversity, but did on the abundance. In the homogeneous zone the harpacticoid copepods were more abundant, followed by...
Tipo: Theses and Dissertations Palavras-chave: Zooplankton; Ecological associations; Oceanic fronts; Abundance; Species diversity; Hydrography; Vertical migrations; Copepoda; Cladocera; Marine environment.
Ano: 2012 URL: http://hdl.handle.net/1834/4777
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Ensambles de peces en los arrecifes norpatagónicos: diversidad, abundancia y relaciones tróficas y con el hábitat OceanDocs
Galvan, D.E..
This study describes the structure and seasonal dynamics of the reef fish assemblages that inhabit the Nuevo and San José gulfs of the Argentine coast. It analyzes relationships between the structure of the assemblage and several habitat variables, with emphasis on shelter availability and refuge characteristics. The diets and feeding strategies of the most conspicuous fish species are described and their impact on the density of one of their preys is evaluated. The northern Patagonian gulfs are in a temperate region (41° – 43° Lat. S) and are characterized by large extensions of sandy bottoms scattered by patches of rocky outcrops that form reefs. The fish assemblage associated to these reefs is low in species richness and has components of the...
Tipo: Theses and Dissertations Palavras-chave: Reef fish; Demersal fish; Ecological associations; Assemblages; Feeding; Feeding; Ecological associations; Http://aims.fao.org/aos/agrovoc/c_2838; Http://aims.fao.org/aos/agrovoc/c_32845.
Ano: 2008 URL: http://hdl.handle.net/1834/2826
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Especie nueva de Heterolaophonte (Copepoda: Harpacticoida: OceanDocs
Varela, C.; Ortiz, M..
A new species of copepod belongs to genus Heterolaophonte Lang, 1948 is described from Cuba. This species was found in association with Acanthopleura granulata (Gmelin, 1791) (Polyplacophora). It constituted the first record of this kind of association.
Tipo: Journal Contribution Palavras-chave: Marine crustaceans; New species; Ecological associations; New species; Ecological associations; Http://aims.fao.org/aos/agrovoc/c_15733; Http://aims.fao.org/aos/agrovoc/c_32845.
Ano: 2008 URL: http://hdl.handle.net/1834/3356
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Estimates of carbon flow through bacteriplankton in the S. Benguela upwelling region based on 3H-thymidine incorporation and predator-free incubations. ArchiMer
Lucas, M; Painting, S; Muir, D.
Spatial and temporal estimates of bacterial numbers, biomass, activity and production were measured in the S. Benguela upwelling system during the course of a phytoplankton bloom. Bacterial numbers and biomass were highest in the euphotic zone and correlated closely with particulate carbon in the water column rather than with chlorophyll a concentrations. 3H-Thymidine incorporation gave good estimates of production. Differential utilisation of photosynthetic exudates and detrital POC by bacterioplankton during the course of a bloom might account for the varying significance ascribed to exudates and POC as a source of carbon for bacterial production.
Tipo: Text Palavras-chave: Ecological associations; Algal blooms; Biomass; Microorganisms; Carbon cycle; Bacteria; Nannoplankton; Upwelling; Biogeochemistry.
Ano: 1984 URL: http://archimer.ifremer.fr/doc/1984/acte-985.pdf
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Estudio de la composición específica, abundancia y distribución espacial del microzooplancton (protozoos y micrometazoos) en el estuario del Río de la Plata (Argentina-Uruguay) OceanDocs
Kogan, M..
Species composition, abundance and spatial distribution of microzooplancton (20-200 km)from the Río de la Plata Estuary, Argentina-Uruguay, SW Atlantic (36°S 56°W)were studied from samples collected during two oceanographic cruises at the end of austral spring (in 1999 and 2001)across a gradient from fluvial to coastal waters (200 km). Heterotrophic dinoflagellates, aloricate ciliates, tintinnids, radiolarians, rotifers and copepod nauplii were found. More than 110 taxa were registered, 35 were new records for the area. Three microzooplanktonic assemblages were distinguished using cluster analysis. Species and groups spatial distribution (horizontal and vertical)was related to the distribution of the maxima gradients (salinity, turbidity, etc.), estuarine...
Tipo: Theses and Dissertations Palavras-chave: Zooplankton; Abundance; Geographical distribution; Salinity stratification; Ecological associations; Brackishwater environment; Community composition; Vertical distribution; Zooplankton; Geographical distribution; Ecological associations; Brackishwater environment; Http://aims.fao.org/aos/agrovoc/c_15490; Http://aims.fao.org/aos/agrovoc/c_5083; Http://aims.fao.org/aos/agrovoc/c_32845; Http://aims.fao.org/aos/agrovoc/c_1050.
Ano: 2005 URL: http://hdl.handle.net/1834/2598
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Estudio de las tramas tróficas asociadas a diferentes densidades de vieira Patagónica Zygochlamys patagonica del Atlántico SO mediante el uso de isótopos estables OceanDocs
Schwartz, M..
Zygochlamys patagonica (King and Broderip, 1832) is an ecosystem engineer mollusk which forms aggregations or banks, of different densities, in the main frontal systems of the SW Atlantic Ocean. The objectives of this work were to analyze the composition, biomass, diversity and species richness of the benthic invertebrate assemblages at different scallop densities as well as the variability of their trophic webs at high and low scallop densities. For this, samples of the benthic invertebrate assemblages were taken at the Shelf Break Front with a non-selective epibenthic dredge. It was evaluated if the abundance (ind/m2) or biomass (colonial species, gr/m2) of the different taxa varied with scallop densities. The results showed that from 14 analyzed, the...
Tipo: Theses and Dissertations Palavras-chave: Benthos; Ecological associations; Trophic relationships; Food webs; Biomass; Isotopes; Shelf fronts; Zygochlamys patagonica; Marine environment.
Ano: 2011 URL: http://hdl.handle.net/1834/4521
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Estudios bionómicos del bentos de la plataforma bonaerense y su relación con el resto de la plataforma continental argentina. OceanDocs
Roux, A..
The macrobenthic assemblages of the Buenos Aires Province(Argentina) continental shelf were studied from samples collected by the R/V Capitán Cánepa and R/V Capitán Oca Balda along a transect from38 m to 218 m depth. Three faunistic areas were determined,corresponding to the coastal, central and external shelf, inhabited by species originated from the Argentine and/or Magellanic Zoogeographical Provinces. These results confirm the presence of different ecological areas in the Argentine continental shelf. Mussel (Mytilus edulis platensis) beds, red porgy (Sparus pagrus) fishing ground and the Argentine-Uruguayan Common Fishing Zone (CFZ) demersal fishing grounds at the continental shelf of Buenos Aires Province were also analyzed to increase the knowledge...
Tipo: Theses and Dissertations Palavras-chave: Zoobenthos; Fishery surveys; Exclusive economic zone; Ecological associations; Dominant species; Stomach content; Fishing grounds; Dominant species; Zoobenthos; Ecological associations; Fishing grounds; Http://aims.fao.org/aos/agrovoc/c_2362; Http://aims.fao.org/aos/agrovoc/c_15487; Http://aims.fao.org/aos/agrovoc/c_32845; Http://aims.fao.org/aos/agrovoc/c_2947.
Ano: 1996 URL: http://hdl.handle.net/1834/1489
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Interactions entre les bacteries et les algues dans une culture continue de phytoplancton naturel soumise aux conditions exterieures ArchiMer
Gauthier, M; Martin, Y; Lelong, P; Breittmayer, V.
During an experimental continuous culture of natural marine phytoplankton in environmental conditions, microbial and biochemical tests performed to study production of antibacterial and antialgal substances by unicellular algae. Some parameters were further monitored to characterize bacteria and phytoplankton growth. The presence of inhibitors of algal origin was studied both in the water and in the algal biomass at different phases of the culture, through bioassays performed with bacteria (marine pseudomonads and vibrios, and telluric strains) and several algal strains. Interpretation of the results is difficult. Two successive phases appeared during the growth of phytoplankton, with two different algal populations. The unsteady population of phase I was...
Tipo: Text Palavras-chave: Bacteria; Algae; Microbiological culture; Heterotrophic organisms; Aerobic bacteria; Phytoplankton culture; Sea water; Ecological associations.
Ano: 1984 URL: http://archimer.ifremer.fr/doc/1984/acte-984.pdf
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La ictiofauna de Bahía San Blas (Provincia de Buenos Aires) y su relación con la dinámica de las pesquerías deportiva y artesanal OceanDocs
Llompart, F.M..
This study analyses the recreational and artisanal fisheries in San Blas Bay and their relationship with the dynamic of the temporal and spatial variability of the coastal fish assemblage. In addition some biological characteristics of two main target species are assessed. San Blas Bay is part of a natural reserve located in the southern part of Buenos Aires province, which has a great value in terms of tourism, ecology and productivity. According to different sampling methodologies used in this thesis 11 species of chondrychthes, 26 species of bony fish, and a hagfish (Class Petromizontida) were recorded, with a predominance of species belonging to Buenos Aires biogeographic province. To evaluate the fish assemblage seasonal pattern, every three months...
Tipo: Theses and Dissertations Palavras-chave: Artisanal fishing; Sport fishing; Fishery management; Coastal fisheries; Marine fish; Ecological associations; Abundance; Catch/effort; Biogeography; Fishing effort; Mustelus schmitti; Odontesthes argentiniensis; Marine environment.
Ano: 2011 URL: http://hdl.handle.net/1834/4779
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Models of relations between bacteria and plankton, and regeneration processes in marine planktonic ecosystem. ArchiMer
Martin, Y; Lelong, P; Cauchi, B.
In order to study bacteria-plankton relationships, experimental and mathematical models were used to stimulate biological processes implicated in plankton ecosystems and to analyze community relationships. The model components are phytoplankton, zooplankton, autotrophic and heterotrophic bacteria, ciliates, nutrients, organic matter and phytoplankton antibiotics. This study shows the importance of some factors affecting bacteria communities dynamics and the bacterial activity in mineralization process. Bacterial populations seem to be controlled essentially by the concentration and chemical composition of organic substrates. Antibiosis and predation show a lesser importance on changes in bacteria communities.
Tipo: Text Palavras-chave: Biogeochemistry; Bacteria; Microorganisms; Mathematical models; Mineralization; Ecosystems; Plankton; Ecological associations.
Ano: 1984 URL: http://archimer.ifremer.fr/doc/1984/acte-982.pdf
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