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Registros recuperados: 44
Primeira ... 123 ... Última
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Asociación bentónicas en bancos de vieira patagónica (Zygochlamys patagonica) en el Mar Argentino OceanDocs
Schejter, L..
The different aspects of the benthic assemblages at the Patagonian scallop beds in the Argentine Sea (SW Atlantic) were studied. The Patagonian scallop (Zygochlamys patagonica) is a commercial species distributed in the Magellanic Biogeographic Province, and has been commercially exploited since 1996. Temporal and spatial studies were performed in the community composition between 39°50'S and 36°15'S, and between 1998 and 2003, concluding that the species association was persistent after more than 7 years of trawling activities. Species composition in an exclusion area (closed to scallop fishing) did not differ from surrounding fished areas during the studied period, showing only a higher scallop biomass. ABC curves showed a pattern coincident with a non...
Tipo: Theses and Dissertations Palavras-chave: Zoobenthos; Community composition; Long-term changes; Short-term changes; Species diversity; Fishing grounds; Epibionts; Scallop fisheries; Multivariate analysis; Multivariate analysis; Zoobenthos; Species diversity; Fishing grounds.
Ano: 2005 URL: http://hdl.handle.net/1834/3917
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Aspectos bioecológicos del ictioplancton en la estación fija "La Libertad" durante 1997 OceanDocs
Luzuriaga de Cruz, M.; Ortega, D.; Elías, E..
El presente trabajo se refiere a las variaciones observadas en el ictioplancton presente en la estación fija "La Libertad" desde febrero de 1997 hasta diciembre del mismo año. Los datos se relacionan con las observaciones ecológicas hechas en base a indicadores de masas de agua, formaníferos planctónicos, presentes en las mismas muestras.
Tipo: Journal Contribution Palavras-chave: Ichthyoplankton; Fixed stations; Fish larvae; Fish eggs; Foraminifera; Community composition; Species diversity; Fish larvae; Species diversity; Http://aims.fao.org/aos/agrovoc/c_2924; Http://aims.fao.org/aos/agrovoc/c_33954.
Ano: 1998 URL: http://hdl.handle.net/1834/2289
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Biodiversidad vegetal acuática de los humedales del río Chepu (Chiloé, Región de Los Lagos, Chile) OceanDocs
González López, C.A..
Se estudió la biodiversidad vegetal acuática y palustre de la Laguna Coluco que forma parte de los Humedales del río Chepu (Chiloé, Chile). La hoya hidrográfica del río Chepu comprende la laguna Coluco y los tributarios de la cuenca: ríos Huentru, Negro, Puntra, Grande, Coluco, abarcando aproximadamente 100 km^2. Los muestreos de terreno se realizaron con la metodología fitosociológica de la Escuela Zürich – Montpellier. Con los censos de vegetación levantados a lo largo del transecto, se confeccionó una tabla fitosociológica inicial con 120 censos y 88 especies vegetales. Esta tabla fue ordenada con los métodos tradicionales, lográndose determinar las 16 asociaciones siguientes: Myriophylletum aquaticum, Potametum pectinatii, Juncetum bulbosii, Potametum...
Tipo: Theses and Dissertations Palavras-chave: Biodiversity; Community composition; Wetlands; Vegetation cover; Aquatic plants.
Ano: 2005 URL: http://hdl.handle.net/1834/4916
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Brachyuran crab community structure and associated sediment reworking activities in pioneer and young mangroves of French Guiana, South America ArchiMer
Aschenbroich, Adelaide; Michaud, Emma; Stieglitz, Thomas; Fromard, Francois; Gardel, Antoine; Tavares, Marcos; Thouzeau, Gerard.
This study in French Guiana evaluates the changes of crab assemblages and their bioturbation activities between mangrove early stages (pioneer and young mangrove) and within stages by taking their spatial heterogeneity (tidal channels, flat areas, pools) into account. The results show differences in crab assemblage structure between and within the early stages of mangrove in relation to microhabitat and sediment characteristics. The sediment reworking rates are a function of the biomass or density of particular species (Ucides cordatus, Uca cumulanta) and burrower functional groups. Crab species or functional interaction mediate changes in sediment reworking rates suggesting the need to consider entire benthic communities rather than single species. This...
Tipo: Text Palavras-chave: Mangroves; Crabs; Community composition; Bioturbation; French Guiana; Amazon.
Ano: 2016 URL: https://archimer.ifremer.fr/doc/00350/46154/45852.pdf
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Cambio temporal en la estructura de la comunidad coralina del área de Santa Marta - Parque Nacional Natural Tayrona (Caribe colombiano) OceanDocs
Martínez, S.; Acosta, A..
Several predictions have been made, about magnitude and direction of temporal changes in the coral community structure, during the last decade. However, few studies have demonstrated it quantitatively. In order to document such changes, the coral community structure was studied in four continental reefs in the Colombian Caribbean, two in the Santa Marta region: Punta Betín (PB) and Morro Grande Island (MO), and two in the Tayrona National Natural Park (PNNT): Granate cove (GR) and Gayraca bay (GA). Coral composition and cover were quantified in 2002 and compared to base line studies from 1989 (PB, MO & GR) and from 1992 (GA). These variables were quantified by 20 m linear transects between 1.5 m and 29 m depth. After a decade, all reefs lost in average...
Tipo: Journal Contribution Palavras-chave: Coral reefs; Degradation; Temporal variations; Community composition; Coral reefs; Degradation; Http://aims.fao.org/aos/agrovoc/c_1880; Http://aims.fao.org/aos/agrovoc/c_2159.
Ano: 2005 URL: http://hdl.handle.net/1834/2012
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Cambios de la densidad de los cladóceros P. avirrostris y E. tergentina durante las épocas cálidas y frías (Dic. 2004 y nov. 2005) en la Bahía de Santa Elena (La Libertad - Ecuador) OceanDocs
Andrade, C..
El objetivo del presente estudio es determinar los cambios poblacionales durante las estaciones cálida y fría de este grupo taxonómico y del zooplancton acompañante más abundante en aguas de la Bahía de Santa Elena vs. las variables ambientales temperatura y salinidad.
Tipo: Journal Contribution Palavras-chave: Zooplankton; Seasonal variations; Coastal waters; Community composition; Population number; Zooplankton; Coastal waters; Http://aims.fao.org/aos/agrovoc/c_15490; Http://aims.fao.org/aos/agrovoc/c_25205.
Ano: 2007 URL: http://hdl.handle.net/1834/2345
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Características de algunas rayas de la región sudpatagónica OceanDocs
Sánchez, M.F.; Mabragaña, E..
Data considered in this paper were obtained during a research cruise carried out on board of RV Dr. E.L. Holmberg from INIDEP (Instituto Nacional de Investigacion y Desarrollo Pesquero) during March-April 2000 in the area between 48°S and 55°S (S Patagonian) region, SW Atlantic. From 61 bottom trawls a total of 355 specimen belonging to 11 skate species were collected. This represents, in number, 1.8 of the total species biomass. All skate species were identified and some biological characteristics for each species analyzed. Abundance was estimated in tons and the distribution area of each species was determined. Total weight and morphometric data by sex were measured total length, disc width and clasper length. Stomach content and macroscopical...
Tipo: Journal Contribution Palavras-chave: Marine fish; Abundance; Stomach content; Food organisms; Diets; Feeding behaviour; Community composition; Feeding behaviour; Http://aims.fao.org/aos/agrovoc/c_10778.
Ano: 2002 URL: http://hdl.handle.net/1834/2426
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Community composition and species richness of parasitoids infesting Yponomeuta species in the Netherlands Naturalis
Cleary, Daniel F.R..
Parasitoid assemblages infesting Yponomeuta species in the Netherlands were investigated. Parasitoid species richness and community composition were related to host species, habitat, temporal and spatial variation. Both community structure and species richness did not differ among habitats. There was no significant difference in species richness between years (1994 and 1995) but there was a significant difference in community composition. Community composition and species richness both differed among host species, although this latter result was solely due to the host species Y. evonymellus. There was no significant relationship between community similarity and distance. These results indicate that the parasitoids of the moth genus Yponomeuta in the...
Tipo: Article / Letter to the editor Palavras-chave: ANOSIM; Beta diversity; Community composition; Distance; Species richness.
Ano: 2004 URL: http://www.repository.naturalis.nl/record/534398
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Composición, distribución y abundancia relativa de copépodos pelágicos calanoideos y no calanoideos en aguas ecuatorianas durante el evento La Niña en septiembre de 2001 OceanDocs
Tutasi, P..
El presente trabajo es una contribución para el conocimiento de la oceanografía biológica de la región ecuatorial tropical donde se manifiestan estas importantes perturbaciones climáticas.
Tipo: Journal Contribution Palavras-chave: Community composition; Marine crustaceans; Abundance; Plankton; Zooplankton; Marine ecology; Indicator species; El Nino phenomena; Geographical distribution; Plankton; Zooplankton; Geographical distribution; Marine ecology; Indicator species.
Ano: 2006 URL: http://hdl.handle.net/1834/2329
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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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Comunidades del plancton en la Caleta Aeolian de la Isla Baltra - Galápagos (Ecuador), durante 2005 OceanDocs
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
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Comunidades del zooplankton en los ríos Teaone, Esmeraldas, Terminal Petrolero y el balneario Las Palmas de Esmeraldas, durante el 2004 OceanDocs
Naranjo, Ch..
Los estudios del zooplancton en diferentes áreas principalmente en el río Teaone, Esmeraldas y la zona marino costera frente a la ciudad que incluye, el área del balneario Las Palmas, en el último año se ha intensificado con el objetivo de obtener un conocimiento detallado de la presencia de estos organismos y las características físico-químicas que condicionan su abundancia y distribución.
Tipo: Journal Contribution Palavras-chave: Community composition; Zooplankton; Biological production; Salinity; Hydrogen; Water quality; Temporal variations; Species diversity; Zooplankton; Biological production; Water quality; Salinity; Hydrogen; Species diversity; Http://aims.fao.org/aos/agrovoc/c_15490; Http://aims.fao.org/aos/agrovoc/c_36649; Http://aims.fao.org/aos/agrovoc/c_16061; Http://aims.fao.org/aos/agrovoc/c_6751; Http://aims.fao.org/aos/agrovoc/c_3724; Http://aims.fao.org/aos/agrovoc/c_33954.
Ano: 2005 URL: http://hdl.handle.net/1834/2372
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Copepod colonization of organic and inorganic substrata at a deep-sea hydrothermal vent site on the Mid-Atlantic Ridge ArchiMer
Plum, Christoph; Pradillon, Florence; Fujiwara, Yoshihiro; Sarrazin, Jozee.
The few existing studies on deep-sea hydrothermal vent copepods indicate low connectivity with surrounding environments and reveal high endemism among vents. However, the finding of non-endemic copepod species in association with engineer species at different reduced ecosystems poses questions about the dispersal of copepods and the colonization of hydrothermal vents as well as their ecological connectivity. The objective of this study is to understand copepod colonization patterns at a hydrothermal vent site in response to environmental factors such as temperature and fluid flow as well as the presence of different types of substrata. To address this objective, an in situ experiment was deployed using both organic (woods, pig bones) and inorganic...
Tipo: Text Palavras-chave: Chemosynthetic ecosystems; Ecological connectivity; Biodiversity and ecosystem functioning; Community composition; Colonization experiment; Hydrothermal activity.
Ano: 2017 URL: http://archimer.ifremer.fr/doc/00342/45318/44776.pdf
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Determination of seasonal phytoplankton communities, based on quantitative data using a mathematical analysis OMA
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
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Dinámica del ultrafitoplancton en el Mar Argentino OceanDocs
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
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Distribución cuali-cuantitativa del fitoplancton en el Pacífico sureste (3°16'-31°23'S), durante El Niño 1997-1998 OceanDocs
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
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Early postlarval fish in the hyperbenthos of the Dutch Delta (south-west Netherlands) OMA
Beyst, B.; Mees, J.; Cattrijsse, A..
Early (post)larval fish constitute a significant part of the temporary hyperbenthos, i.e. of the fauna living in the lower reaches of the water column close to the substratum. Information on the densities and spatial and temporal variations of these stages, as well as on their lengths at the moment of occurrence, can be an important contribution to the knowledge of their dispersion, migrations and to the identification of possible bottlenecks in their recruitment. Therefore the hyperbenthos of the Voordelta, a shallow coastal zone in front of the Dutch Delta, as well as that of the subtidal channels and the intertidal brackish marsh creeks of the Westerschelde Estuary, was sampled monthly during one year by means of a sledge and a stow net. A total of 37...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Community composition; Deltas; Dominant species; Ecological distribution; Estuaries; Intertidal environment; Juveniles; Marine fish; Nursery grounds; Pleuronectes; Population density; Salt marshes; Sprattus sprattus; Wetlands; Zoobenthos; Clupea harengus; Dicentrarchus labrax [Bass]; Solea solea [Sole].
Ano: 1999 URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=3979
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El efecto de la temporada ciclónica 2005 sobre el fitoplancton de la Bahía de Cienfuegos, Cuba OceanDocs
Moreira, A.; Comas, A.; Seisdedo, M.; Barcia, S..
El fitoplancton es uno de los componentes más abundantes de la biodiversidad de la Bahía de Cienfuegos. Se estudió el impacto de la temporada ciclónica 2005 sobre la composición y abundancia de estos organismos en el período de marzo-octubre. La composición específica de microalgas planctónicas de la bahía en marzo estuvo dominada por diatomeas y dinoflagelados marino-estuarinos como Nitzschia longissima, Thalassionema nitzschioides y Prorocentrum micans. Al final de la temporada ciclónica, los cambios en la estructura de la comunidad fitoplanctónica fueron drásticos, prácticamente no se registró fitoplancton marino en la bahía. Las microalgas dulciacuícolas de los géneros Chlorella, Monoraphidium, Cyclotella, Aulacoseira, Pseudoanabaena, Planktothrix,...
Tipo: Journal Contribution Palavras-chave: Aquatic communities; Community composition; Bays; Planktonic algae.
Ano: 2012 URL: http://hdl.handle.net/1834/5699
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Epibionts on Flexopecten felipponei (Dall, 1922), an uncommon scallop from Argentina OceanDocs
Schejter, L.; Bremec, C..
Flexopecten felipponei (Dall, 1922) is a non-commercial, seldom reported pectinid from the SW Atlantic Ocean. In this contribution we review its taxonomy, describe epifaunal species and their levels of encrustation, and discuss the composition of the macrobenthic assemblage where this scallop Iives. Eighteen epibiont taxa were observed to Iive on the valves of these scallops. The most frequent and abundant epibionts on F. felipponei were serpulids, barnacles, and oysters. Although both valves were encrusted, the left valves had higher percentages of coverage. The benthic community contained 69 invertebrate taxa that generally charaeterize other mid-shelf bottorns between 37°S and 39°S. Eight pea crabs of the species Tumidotheres maculatus (Say, 1818)were...
Tipo: Journal Contribution Palavras-chave: Benthos; Taxonomy; Community composition; Benthos; Taxonomy; Http://aims.fao.org/aos/agrovoc/c_878; Http://aims.fao.org/aos/agrovoc/c_7631.
Ano: 2007 URL: http://hdl.handle.net/1834/1815
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Estrategias de vida de los copépodos Drepanopus forcipatus y Calanus australis en relación con los recursos tróficos en la plataforma patagónica austral (Argentina, 47°- 55°S) OceanDocs
Antacli, J.C..
This Thesis contributes to elucidate the life cycle strategies of two copepod species, the medium-size clausocalanid Drepanopus forcipatus Giesbrecht, 1888 and the large calanid Calanus australis Brodsky, 1959, in relation to the environmental conditions in the southern Patagonian shelf (47°-55°S). This research was mainly carried out with samples collected in late summer/early autumn (March/April, 2004) onboard RV "Dr. E. L. Holmberg" (INIDEP, Mar del Plata). An additional sampling performed during early spring (October, 2005) with RV "Puerto Deseado" (CONICET) was also utilized. The present study was based on the following research questions: 1) Which is the available food for copepod populations by late summer? 2) Which is the relative contribution of...
Tipo: Theses and Dissertations Palavras-chave: Zooplankton; Trophic levels; Population structure; Hydrography; Community composition.
Ano: 2011 URL: http://hdl.handle.net/1834/4205
Registros recuperados: 44
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