Influence of different types of margins in the fish assemblage from an urban river

The presence or absence of a fish species may be associated with the physical and chemical characteristics water, in addition to state preservation riparian zone. This study examined whether taxonomic composition an urban river varies along three zone conditions: preserved, intermediate degraded. Six stretches Sorocaba/São Paulo River were selected for this study, monthly sampling being carried out from June 2019 February 2020. samplings aid sieve, dip net, trawl. Regarding types margins environmental variables, Principal Component Analysis explained 97.49% data variation, axis 1, which 91.85% total was formed by variables conductivity dissolved solids. Axis 2, 5.64% Sun Rays% Siltation%, inversely proportional Riparian Forest%. For ichthyofauna, samples consisted 50,983 distributed 5 orders, 8 families, 12 species. Cyprinodontiformes had highest abundance, 96.96% number individuals, followed Siluriformes (2.39%), sum other orders did not reach 1% collected. According each type margin, it possible register 11,592 individuals Margin A í S=8 species, 2 exclusive (Corydoras flaveolus Hoplosternum littorale) 3 exotic (Coptodon rendalli, Pterygoplichthys ambrosettii, Poecilia reticulata), latter dominant all margins. B preservation, 19,645 sampled, S=5 no only more tolerant native such as Hoplias malabaricus Hypostomus ancistroides. C degraded, 19,746 recorded, largest (S=10), margin (Psalidodon fasciatus, Rhamdia Quelen, Geophagus brasiliensis). pairwise comparison (similarity percentage) showed that assemblage structure different Canonical Correspondence 92.46% showing relationship data. It is evident importance micro-habitats still present locals since anthropic pressures cause great loss diversity, especially sensitive