ECOMORPHOLOGICAL VARIATION IN Hypostomus ancistroides (IHERING, 1911) POPULATIONS OF THE UPPER PARANÁ RIVER BASIN

• Autor(a) principal: de Souza, Fagner
• Data de Publicação: 2023
• Outros Autores: Altoé, Guilherme Guerino, da Silva Camargo, Paulo Ricardo, da Silva, Roenilson Gaia, Frota, Augusto
• Tipo de documento: Artigo
• Idioma: por
• Título da fonte: Biota Amazônia
• Texto Completo: https://periodicos.unifap.br/index.php/biota/article/view/6655
• topic: Barramentos; cascata de reservatórios; morfologia; rio Ivaí; rio Paranapanema

Hypostomus ancistroides (Ihering, 1911) is a widely distributed species in the upper Paraná river basin and is also one of the most abundant species of this hydrographic region. Considering the premise that isolated populations in environments with distinct environmental characteristics may be influenced by intrinsic abiotic and biotic factors of the site, which culminate in the selection of certain adaptive attributes of an ecological character, we have tested the hypothesis that populations of H. ancistroides resident in different basins present differences in ecomorphological attributes. A total of 150 individuals of H. ancistroides from 10 different basins were analyzed within the upper Paraná River system. Fifteen specimens of H. ancistroides from each population were used to test the differences. Twenty-six morphometric measures were taken and six areas were calculated, so that 22 ecomorphological indices were calculated. In order to demonstrate ecomorphological differences between the specimens, we performed Canonical Variate Analysis (CVA) and a post hoc test of paired comparisons of Hotelling. All comparative relationships among populations showed significant differences. The factors that influenced the population variations were credited to the hydrodynamic differences in the longitudinal dimension of the rivers provided, mainly, by cascade of reservoirs and their consequences.Keywords: Cascade of reservoirs; dams; Ivaí River; morphology; Paranapanema River.