ICTIOFAUNA, CONSERVAÇÃO E INTERFERÊNCIAS ANTROPOGÊNICAS EM RIACHOS DO ALTO DA BACIA DO RIO PARANÁ EM GOIÁS, REGIÃO CENTROOESTE

Abstract

This study was conducted in the basin of the João Leite River, which integrates the high Paraná River basin in the southwest of the Goiás State. This river has origin in the Ouro Verde county and it empties in the Meia Ponte River, its basin shelter about 1.600.000 inhabitants distributed in seven counties. The weather is classified as hot and sub-humid with four or five dry months. The predominant covering vegetation is the Cerrado, a savanna vegetation type. This study aims to i) compare the fish assemblages of four creeks located into a conservation unit (Altamiro de Moura Pacheco Ecological State Park) with this of six creeks presents in not preserved areas in the same basin; and ii) determine the fish-environment interaction considering 24 creeks of the sub-basin of the River João Leite. Fish sampling was carried through in the low water period using electric fishing in stretches of 50m, where the environmental parameters were measured with portable equipment (pH, conductivity, turbidity) and through satellite s images (size of the drainage, grazing, urban and covering vegetation areas). The comparison of fish assemblages was given through a cluster analysis followed by a Morisita-Horn index, and the quality of the aquatic environment was evaluated by the method of ABC curves , whereas the relation fish-environment was determined by multiple regression analysis, method stepwise. The preserved creeks present a richness average bigger than this in creeks not preserved, but in both the assemblages suffer influence of natural or anthropogenic disturbances. The multiple regression analysis indicates that of the seven parameters analyzed, only the pH and covering vegetation of the basin structure the ichthyofauna of the creeks and is related to the changes of the landscape of anthropic origin in this studied basin.