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	Provedor de dados Neotropical Ichthyology (3) Autor Agostinho,Carlos Sérgio (3) Marques,Elineide Eugênio (3) Oliveira,Rafael José de (3) Agostinho,Angelo Antônio (1) Almeida,Deusimar Augusto de (1) Freitas,Iriene Siqueira (1) Melo,Jussiclene Rodrigues Bezerra de (1) Pereira,Celiana Ribeiro (1) Pereira,Poliana Ribeiro (1) Mais... Palavra-chave Reservoir (2) Biodiversity (1) Downstream migration (1) Feeding plasticity (1) Fish conservation (1) Fish diet (1) Fish migration (1) Fish passage (1) Larvae drift (1) Resource availability (1) Rio Tocantins (1) Seasonality (1) Mais... Tipo do documento Info:eu-repo/semantics/article (3) Ano 2007 (3) País Brazil (3) Idioma Inglês (3)		Ordenar por:  Relevância Autor Título Ano Registros recuperados: 3 Primeira ... 1 ... Última Fish ladder of Lajeado Dam: migrations on one-way routes? Neotropical Ichthyology Agostinho,Angelo Antônio; Marques,Elineide Eugênio; Agostinho,Carlos Sérgio; Almeida,Deusimar Augusto de; Oliveira,Rafael José de; Melo,Jussiclene Rodrigues Bezerra de. Fish ladders are generally conceived to reestablish connectivity among critical habitats for migratory species, thus mitigating the impacts of the blockage of migration routes by dams. If this management tool is to be meaningful for conserving fish species, it must provide a fully permeable connection and assure both upward and downward movements. However, because reservoirs have very different hydrodynamics than the original river, it is expected that, at least in the inner area, they may constitute an additional barrier to this movement, especially for descending fish. Thus, the present study sought to determine if migratory fish and their offspring disperse downstream from the dam after ascending a ladder and spawning in the upper reaches of a basin. To... Tipo: Info:eu-repo/semantics/article Palavras-chave: Fish passage; Reservoir; Downstream migration; Larvae drift; Rio Tocantins. Ano: 2007 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252007000200005 Movements through a fish ladder: temporal patterns and motivations to move upstream Neotropical Ichthyology Agostinho,Carlos Sérgio; Pereira,Celiana Ribeiro; Oliveira,Rafael José de; Freitas,Iriene Siqueira; Marques,Elineide Eugênio. Fish passages are constructed with the aim of reestablishing connectivity between critical habitats, in order to sustain those species that move over a large area during their lives. The upstream movements of most of the known migratory species are made for purposes of reproduction (adults) or dispersal (juveniles). The present study was conducted at the ladder constructed at Lajeado Dam (Luis Eduardo Magalhães Hydroelectric Power), on the Tocantins River. The objective was to assess whether there is a temporal pattern in the abundance of fish below the dam and in the ladder, that correlates with their breeding seasons. Additionally, it was examined whether reproduction is the predominant motivation of the shoals of fish that ascend the ladder. Samples... Tipo: Info:eu-repo/semantics/article Palavras-chave: Fish migration; Fish conservation; Biodiversity; Reservoir; Seasonality. Ano: 2007 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252007000200010 Trophic guilds of fishes in sandbank habitats of a Neotropical river Neotropical Ichthyology Pereira,Poliana Ribeiro; Agostinho,Carlos Sérgio; Oliveira,Rafael José de; Marques,Elineide Eugênio. The objective of this study was to characterize the trophic structure of the community of fishes exploiting riverine sandbank habitats. Collections were carried out during the period of October 1999 to December 2003, on six sand banks in the upper and middle portions of the Tocantins River drainage basin in central Brazil. The availability of food resources was evaluated based on the volume of the items present in the stomachs of all species. A total of 2,127 stomachs of fish belonging to 50 species were analyzed. Nine main trophic guilds grouped the local ichthyofauna according to diet. Aquatic-origin items were the preferred source for 55.5% of the groups analyzed, whereas terrestrial-origin items composed 44.4%. Items of undetermined origin (detritus... Tipo: Info:eu-repo/semantics/article Palavras-chave: Feeding plasticity; Fish diet; Resource availability. Ano: 2007 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252007000300019 Registros recuperados: 3 Primeira ... 1 ... Última

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