Data/hora: 01/06/2024 18:05:43

Provedor de dados: | Neotropical Ichthyology
País: | Brazil
Título: | Fish assemblage in a dammed tropical river: an analysis along the longitudinal and temporal gradients from river to reservoir
Autores: | Terra,Bianca de Freitas; Santos,Alex Braz Iacone dos; Araújo,Francisco Gerson.
Data: | 2010-01-01
Ano: | 2010
Palavras-chave: | Spatial patterns; Physico-chemical variables; Reservoirs.
Resumo: | We analysed changes in the fish assemblage structure along a longitudinal gradient of the Paraíba do Sul River and Funil Reservoir. We tested the hypothesis that shifts from lotic to lentic environment affect the richness and structure of the assemblage which are modulated by seasonal rainfall changes. Standardised monthly samplings were carried out from October 2006 to September 2007 in four zones: 1) river upstream from the reservoir; 2) upper part of the reservoir; 3) lower part of the reservoir, and 4) river downstream from the reservoir. Fishes were caught using gillnets deployed for 15 hours. We collected a total of 4550 specimens, representing 35 species and 5 orders. The highest richness and diversity were recorded in zone 2, the transitional zone between river and reservoir. In this ecotone, lotic and lentic species overlap. Greater abundance and biomass was recorded in the river upstream from the reservoir (zone 1); however, there are no differences between the zones in the structure of assemblages during the wet season. During the dry season, the assemblage structure is more differentiated between zones, although no differences in abundance and biomass occur. The seasonal flow of the river is the major driving factor to influence the fish assemblage structure along the longitudinal gradient from the river to the reservoir.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252010000300004
Editor: | Sociedade Brasileira de Ictiologia
Relação: | 10.1590/S1679-62252010000300004
Formato: | text/html
Fonte: | Neotropical Ichthyology  v.8 n.3 2010
Fonte: | info:eu-repo/semantics/openAccess