Padrões de distribuição da fauna endoparasitária de peixes pimelodídeos das bacias hidrográficas dos rios Solimões, Cuiabá e Paraná.

Abstract

Studies related to the distribution and abundance of species is common in ecology, and has been a tendency in researches of fish parasitology. These researches allow us to infer which factors, biotic and/or abiotic, can present more influence in the communities of fish parasites. This work had as main objective to verify the similarity of the endoparasitary community of two fish species, using special distribution in macro scales. To achieve this purpose, two species of fish of the family Pimelodidae were chosen: Hemisorubim platyrhynchos and Sorubim lima, collected in three different geographical basin (Amazon river basin, Cuiaba river basin and high Parana river basin). These species are piscivores, consuming small fishes and some crustaceans and live in the deep regions of rivers and lakes. The results shows that the endoparasitary distribution of H. platyrhynchos and S. lima are not predictable in space, cause in each sampled location the endoparasitary populations presented different values of ecological descriptors (prevalence, mean intensity and mean abundance of parasisitism) dominance, richness and diversity of the specie.