A estrutura das comunidades de peixes das Bacias dos Rios Cuiabá e Negro, Pantanal, Brasil

Abstract

This thesis aims to test effect of multiple scales in mosaic on the landscape pattern of organization of assemblages of fish in the Pantanal. The samples were taken from 2005 to 2010 in lakes in the Cuiabá River and from 2005 to 2006 in the Negro River. In 2009 and 2010 they were also sampled the littoral zone of the main River Cuiabá. The samples in Cuiabá River showed that the basin has a rich ichthyofauna, with higher values in vegetated lakes wh n compared to non-vegetated rivers. The high species richness in the Cuiabá River basin was far higher than the Negro River, with estimates of 222 species for the first and 60 for the second. The Cuiabá River basin showed also higher diversity values Alfa, Shannon, Simpson, but both rivers showed similar abundances curves. The pattern of spatial distribution of nesting diversity was similar, with major contributions from the meso and beta diversity macroescalas. This indicates that the key processes are the same in both basins, although not overlapping the lagoons. In relation to biological conservation, this study shows the importance of these coastal areas for the maintenance of diversity.