LONGITUDINAL INFLUENCE OF DAMS ON THE FISH FAUNA STRUCTURE IN SMALL ORDER STREAM

• Autor(a) principal: Tozzo, Robson Alexandre
• Data de Publicação: 2017
• Outros Autores: Frota, Augusto, Ota, Renata Rúbia, de Souza, Fagner
• Tipo de documento: Artigo
• Idioma: por
• Título da fonte: Biota Amazônia
• Texto Completo: https://periodicos.unifap.br/index.php/biota/article/view/3096

To evaluate the environmental differences between the region upstream and downstream of dams, we aimed to inventory and to compare the ichthyofauna and the ecological parameters in two sampled areas (córrego Japira, upstream, and córrego Água do Xaxim, downstream of the dams), located in the rio Tibagi basin, system of upper rio Paraná basin. The ecological parameters used were: abundance, species richness and diversity, evenness and dominance. We used an ANOVA to compare the ecological parameters between the streams. There was great dominance of Poecilia reticulata in both streams, but the córrego Água do Xaxim showed higher values of richness, diversity, and evenness and lower values of abundance and dominance compared to the córrego Japira values. Only the abundance (p = 0.0049), evenness (p = 0.0190) and dominance (p = 0.0392) showed significant differences between the streams. Furthermore, the environmental quality of the córrego Água do Xaxim was preserved, while the córrego Japira  was impacted. The differences between the parameters associated with the environmental quality damaged by the dam, led us to infer that the córrego Japira has been suffering with ecological impacts and emphasizes the need for conservation actions.Keywords: Upper rio Paraná basin, upstream, downstream, ecological parameters.