%0 Journal Article
%T Fish-assemblage structure of the Corumbatai river basin, S£¿o Paulo State, Brazil: characterization and anthropogenic disturbances
%A Cetra
%A M.
%A Petrete Jr.
%A M.
%J Brazilian Journal of Biology
%D 2006
%I Scientific Electronic Library Online
%R 10.1590/S1519-69842006000300007
%X the corumbata¨ª river is one of the main tributaries of the right margin of the piracicaba river, itself a tributary of tiet¨º river. the corumbata¨ª is part of the paran¨¢ river basin and is regionally important not only because of its good-quality water but also because the local landscape has unique features. this study aimed to characterize the fish assemblage of the corumbata¨ª in order to provide background data for evaluating its environmental status. for this purpose, within the corumbatai river basin 4 of the main rivers were chosen, along which 3 sampling points each were established. twenty-four samplings were carried out during march-july and september-december 2001. diversity measures were used to evaluate biotic data. a linear ancova model was used to test the hypothesis of a spatio-temporal variation in the fish assemblage, with species richness as the response variable, river order as the factor, and temperature and the natural logarithm of number of individuals as covariates. this analysis showed a spatio-temporal variation in agreement with various concepts, e.g., the specie-area relationship and the river continuum, which have been exhaustively discussed in the literature. when compared to those of the other rivers, data from the ribeir£¿o claro river showed a different pattern, probably due to human interference, and exemplifying aquatic habitat fragmentation that might have led to isolation of local fish populations.
%K paran¨¢ river basin
%K corumbata¨ª river
%K fish assemblage
%K species diversity
%K habitat fragmentation.
%U http://www.scielo.br/scielo.php?script=sci_abstract&pid=S1519-69842006000300007&lng=en&nrm=iso&tlng=en