Abstract
The fishes of the present study were collected in the headwater streams of the Sorocaba, Paranapanema and Ribeira de Iguape river basins during the dry period in 2010. A total of 2892 fishes, grouped in 53 species, were captured. The composition of the ichthyofauna captured in the streams of Sorocaba and Paranapanema river basin was greatly similar. On the other hand, the fish fauna of the streams of Ribeira de Iguape river basin were quite different from the ones captured in the others basins, with the occurrence of endangered species (Isbrueckerichthys epakmos and I. duseni) and exotic species (Misgurnus anguillicaudatus). The previous list of fish for the Sorocaba river basin increased with the addition of seven species of Characiformes, one Gymnotiformes and four Siluriformes.
Highlights
Despite knowing that no species of fish is totally extinct in the aquatic ecosystem of São Paulo state, we know that the small headwater streams are quickly and negatively being altered by anthropogenic interventions in their drainage basins (Castro and Menezes 1998)
Drainage basin is separated topographically by the Serra de Paranapiacaba that represents a geographical barrier of the adjacent basins of Sorocaba, Paranapanema and Ribeira de Iguape rivers
The specific composition of the streams of the Ribeira de Iguape river basin was quite different from the ones captured in the Sorocaba and Paranapanema basins (ISRI-S = 0.27 and ISRI-P = 0.31)
Summary
Despite knowing that no species of fish is totally extinct in the aquatic ecosystem of São Paulo state, we know that the small headwater streams are quickly and negatively being altered by anthropogenic interventions in their drainage basins (Castro and Menezes 1998). The Ribeira de Iguape river basin has native vegetation and a high number of Conservation Units in a large portion of its area.
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