CARACTERIZAÇÃO DA ASSEMBLÉIA DE PEIXES DA SUB-BACIA DO RIO CLARO E SUAS RELAÇÕES COM OS PADRÕES DE OCUPAÇÃO HUMANA NO SUDOESTE DO ESTADO DE GOIÁS BRASIL

Abstract

In order to characterize the fish fauna of the Claro river sub-basin as well as to establish a distributional pattern based on the hypothesis of the ichtyofaunistic differentiation promoted by the segmentation of the river by possible natural barriers, six stretches along this river and the confluence of its main tributaries were sampled in December 2005 (rainy season). The collecting sites were chosen on the basis of the presence of waterfalls or rapids along the river. There were 372 specimens collected distributed in 4 orders, 15 families, 5 subfamilies, 32 genera, and 48 species. The animals were collected with the use of nets with mashes varying from 12 and 90 mm between knots, coop with funneled entrances and throw nets. The primary data were correlated with available data of the same nature from other localities within the Paranaíba river basin, upper Paraná hydrographic region. The indexes of constancy, dominance, abundance, richness, similarity, and diversity of species were considered, besides the curve of rarefaction of species analysis and detrended correspondence analysis (DCA). Generally the data supports a differentiation among stretches, which suggests a correlation with the rapids that establish a negative gradient of species upstream of Claro river. The higher indexes were attributed to Point 2, where there are tributaries of several categories therefore the importance of the management and preservation of these environments.