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	Provedor de dados Neotropical Ichthyology (2) Autor Keppeler,Friedrich W. (2) Winemiller,Kirk O. (2) Bower,Luke M. (1) Kelso-Winemiller,Leslie C. (1) López-Delgado,Edwin O. (1) Montaña,Carmen G. (1) Peterson,Christopher C. (1) Saenz,David E. (1) Taphorn,Donald C. (1) Mais... Palavra-chave Aquatic ecosystem (1) Dispersal (1) Flood pulse (1) Fluvial gradient (1) Freshwater fish (1) Neotropics (1) Nestedness (1) Predation (1) Predator-prey interactions (1) Trophic niche (1) Mais... Tipo do documento Info:eu-repo/semantics/article (2) Ano 2018 (1) 2017 (1) País Brazil (2) Idioma Inglês (2)		Ordenar por:  Relevância Autor Título Ano Registros recuperados: 2 Primeira ... 1 ... Última Seasonal variation in fish trophic networks in two clear-water streams in the Central Llanos region, Venezuela Neotropical Ichthyology Peterson,Christopher C.; Keppeler,Friedrich W.; Saenz,David E.; Bower,Luke M.; Winemiller,Kirk O.. ABSTRACT Food webs are not static entities; consumer resource interactions vary in both time and space, which complicates depiction and comparisons of food web structures. We estimated fish assemblage structure and diets in two clear-water streams in the Venezuelan Llanos region (Charcote and Charcotico) and constructed trophic networks (sub-webs defined by fishes as the principal consumers) during four periods of the annual flood pulse. As stream conditions changed from high-water to low-water, we hypothesized that: 1) the piscivore-non-piscivore ratio would increase; 2) dietary diversity would decrease; 3) interspecific dietary overlap would decline; 4) fewer allochthonous food items would be consumed; and 5) food-web connectance would increase. The... Tipo: Info:eu-repo/semantics/article Palavras-chave: Aquatic ecosystem; Flood pulse; Predation; Predator-prey interactions; Trophic niche. Ano: 2017 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252017000200215 Fish metacommunity structure in Caño Maraca, an important nursery habitat in the Western Llanos of Venezuela Neotropical Ichthyology Winemiller,Kirk O.; Taphorn,Donald C.; Kelso-Winemiller,Leslie C.; López-Delgado,Edwin O.; Keppeler,Friedrich W.; Montaña,Carmen G.. ABSTRACT We investigated spatial and seasonal variation of fish assemblages of Caño Maraca, a creek in Venezuela’s Western Llanos, a region with strong wet-dry seasonality. Fishes were surveyed over a 19-year period at three sites along the longitudinal gradient: a headwater site with a narrow channel, a middle site with shallow channels traversing a seasonal wetland, and a lower site where the channel has higher banks. Assemblage composition and presence of species with juveniles and various life history strategies were compared during wet and dry seasons. Overall, fish species richness was lowest at the headwater site and highest at the downstream site. During the wet season, however, species richness is greatest at the middle site, a pattern associated... Tipo: Info:eu-repo/semantics/article Palavras-chave: Dispersal; Fluvial gradient; Freshwater fish; Neotropics; Nestedness. Ano: 2018 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252018000400217 Registros recuperados: 2 Primeira ... 1 ... Última

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