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| Registros recuperados: 13 | |
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| De los Rios, Patricio. |
| Los ensambles zooplanctónicos en cuerpos de agua de la zona centro y sur de la Patagonia chilena se caracterizan por su alto endemismo y un relativo bajo número de especies lo cual se debería principalmente a la oligotrofía y niveles de conductividad de estos ambientes. El objetivo del presente trabajo consistió en analizar información publicada y sin publicar sobre crustáceos zooplanctónicos en lagos y lagunas de la zona central y sur de la Patagonia (44 - 53g S). A estos datos se les estimó la razón especies / género, y se aplicó un modelo nulo basado en co-ocurrencia de especies mediante una matriz de presencia y ausencia de especies, con la intención de determinar ausencia de factores reguladores de las asociaciones de especies. Dentro de este mismo... |
| Tipo: Journal Contribution |
Palavras-chave: Zooplankton; Assemblages; Lakes; Ponds; Crustaceans. |
| Ano: 2008 |
URL: http://hdl.handle.net/1834/4161 |
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| Corbera, Jordi; Sorbe, Jean Claude. |
| The structure of the cumacean assemblages from the southern margin of the Cap Ferret Canyon was studied at 13 stations ranging from 346 to 1099 m depth with a modified Macer-GIROQ suprabenthic sledge (four superimposed nets; 0.5 mm mesh size). A total of 1885 specimens were collected and classified into 5 families and 42 species. The total abundances fluctuated between 2.8 ind./100 m2 (station TS04; 484-485 m) and 55.8 ind./100 m2 (station TS08; 714-708 m). The highest values of species richness and diversity were recorded at station TS13 (1097-1099 m): S=25 species; H’(log2)=4.05. The near-bottom vertical distribution of the cumacean fauna showed the same pattern at all stations: at least 60% of the individuals were sampled by the lower net of the sledge... |
| Tipo: Text |
Palavras-chave: Cumacea; Assemblages; Suprabenthos; Bathyal; Bay of Biscay; NE Atlantic Ocean. |
| Ano: 2020 |
URL: https://archimer.ifremer.fr/doc/00629/74124/73558.pdf |
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| Vides Casado, M. P.. |
| El presente análisis relaciona la distribución espacial de especies de la megafauna bentónica con gradientes de variables ambientales estimadas cerca al fondo oceánico, haciendo uso de datos obtenidos a lo largo de la provincia del mar Caribe colombiano. Los datos utilizados corresponden a muestras de megafauna bentónica obtenidas en 96 sitios de colecta entre los años 1999 y 2008 en un ámbito de profundidad entre 15 y 900 m. La distribución latitudinal de los taxa mayores se analizó a través de perfiles del fondo de 100 km de longitud desde la línea de costa. Se utilizaron curvas de acumulación de especies con intervalos de confianza de 95 % para hacer las comparaciones. La distribución de la megafauna bentónica se relacionó con los parámetros ambientales... |
| Tipo: Journal Contribution |
Palavras-chave: Benthos; Assemblages; Depth. |
| Ano: 2011 |
URL: http://hdl.handle.net/1834/4400 |
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| Koranteng, K.A.. |
| The structure of demersal fish assemblages on the continental shelf and upper continental slope of the Gulf of Guinea is described. Community structure is determined primarily by depth and type of sediment on the seabed. Changes in the composition of the identified species assemblages over a 25-year period are examined. The dynamics of the assemblages are influenced by physico-chemical parameters of the water masses, mainly temperature, salinity and dissolved oxygen, which are periodically modified by the seasonal coastal upwelling that occurs in the western Gulf of Guinea. Increased irresponsible fishing operations (like the use of explosives) that lead to habitat alteration and other anthropogenic activities like oil and gas exploration which have the... |
| Tipo: Journal Contribution |
Palavras-chave: Assemblages; Ecosystems; Demersal fish; Ecosystems; Http://aims.fao.org/aos/agrovoc/c_2482. |
| Ano: 2001 |
URL: http://hdl.handle.net/1834/1265 |
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| Giberto, D.A.; Bremec, C.; Cortelezzi, A.; Rodrigues Capitulo, A.; Brazeiro, A.. |
| In this study, we analyse spatial patterns of macrobenthic communities of the Río de la Plata system, and assess the species turnover or beta diversity and its relationship with environmental gradients. Macrobenthic samples and physico-chemical parameters were collected from 20 sampling sites along a transect of 560 km, including the freshwater (FW), estuarine (ES)and marine (MA)sectors. Three main assemblages corresponding to the above mentioned sectors were defined with multivariate analysis (cluster, MDS). In total 134 taxa were recorded, 81 in MA, 33 in FW and 38 in ES, represented mainly by polychaete, mollusc and crustacean species. Depth, salinity and clay showed the strongest correlation with the observed faunal patterns (pw=0.62; BIO-ENV... |
| Tipo: Journal Contribution |
Palavras-chave: Macrobenthos; Assemblages; Brackishwater environment; Estuaries; Estuaries; Macrobenthos; Brackishwater environment; Http://aims.fao.org/aos/agrovoc/c_2673; Http://aims.fao.org/aos/agrovoc/c_12312; Http://aims.fao.org/aos/agrovoc/c_1050. |
| Ano: 2007 |
URL: http://hdl.handle.net/1834/1571 |
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| Perera-Valderrama, S.; Claro-Madruga, R.; Caballero-Aragón, H.; Cobián-Rojas, D.; Chevalier-Monteagudo, P.P.. |
| Para la ejecución del plan de manejo del Parque Nacional Guanahacabibes es necesario establecer una línea base sobre la diversidad y estructura de las asociaciones de peces, así como sus posibles cambios como consecuencia de las variaciones espaciales y temporales. Se realizaron censos visuales de todas las especies en períodos lluvioso y poco lluvioso de los años 2007-2008, en sus principales zonas del arrecife. Se evaluaron 15 estaciones, mediante 6 tramos de 50 x 2 m. Entre los períodos lluvioso y poco lluvioso no se observaron diferencias significativas en los principales indicadores de la estructura de las asociaciones (diversidad de especies, densidad, biomasa, tallas y categorías tróficas), pocas especies mostraron diferencias en su abundancia como... |
| Tipo: Journal Contribution |
Palavras-chave: Assemblages; Population abundance (in number); Marine fish; Coral reefs. |
| Ano: 2011 |
URL: http://hdl.handle.net/1834/4178 |
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| Miserendino,M. Laura; Gullo,Bettina S.. |
| Temporal (May 2005 to February 2006) and habitat distribution (pools and riffles) of Hirudinea species was analyzed at a post urban reach from Esquel stream (Chubut province, Patagonia, Argentina). Site was located 5.7 km downstream a Waste Treatment Plant. Mean values of nutrients: ammonia, nitrates and soluble reactive phosphate, as well water conductivity, turbidity and total suspended solids indicated physical and organic pollution. Leeches assemblage was composed by the glossiphonids: Helobdella scutifera Blanchard, 1900, H. michaelseni (Blanchard, 1900), H. simplex (Moore, 1911), Helobdella sp., H. hyalina Ringuelet, 1942, H. obscura Ringuelet, 1942 and the semiscolecid Patagoniobdella variabilis (Blanchard, 1900). From these H. hyalina and H.... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Leeches; Assemblages; Streams; Urbanization; Organic pollution. |
| Ano: 2014 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0073-47212014000300006 |
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| Jaureguizar, A.J.. |
| The spatial and temporal changes of the fish assemblage areas composition at the coastal ecosystem of the western South Atlantic (34 degree -41 degree S) during six springs (1981, 1983, 1994, 1995, 1998 and 1999), were examined. For each assemblage area the most common species and those species that discriminate it from adjacent assemblages areas within years, were identified. Within each area, also resident (common in all years) and facultative (contributing to less than 90% of similarity within any year) species, were studied. Also were identified what parameters control the main structuring of the fish community on the spatial and temporal patterns. In order to determine how the environmental factors influenced the fish community structure, the... |
| Tipo: Theses and Dissertations |
Palavras-chave: Marine fish; Community composition; Coastal fisheries; Ecosystem management; Species diversity; Coastal zone; Ecological zonation; Environmental factors; Assemblages; Ecological zonation; Environmental factors; Coastal fisheries; Species diversity; Http://aims.fao.org/aos/agrovoc/c_2465; Http://aims.fao.org/aos/agrovoc/c_2594; Http://aims.fao.org/aos/agrovoc/c_1696; Http://aims.fao.org/aos/agrovoc/c_33954. |
| Ano: 2004 |
URL: http://hdl.handle.net/1834/1469 |
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| Registros recuperados: 13 | |
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