Variação ecomorfológica de peixes bentônicos em três córregos nabacia do alto rio Paraná

The morphology and life habits of benthic fish is a consequence of theirrelationship with environment in which it is inserted. In this context, the study of this interaction is called Ecomorphology, which aims to identify the pressure that the environment exerts on the phenotypic characteristics of animals. Thus, thehypothesized tested was that qualittive environmental characteristic influence in distinct forms the inter and intraspecific ecomorphological variations. For this, weaimed to analyse ecomorphological variations among benthonic fish species from the three streams of different sub-basins in the Upper Paraná River region. We wereperfomed body linear measurements, and were calculated eye and fins areas. The indexes were calculated based in measurements and body areas, and after a Principal Component Analysis (PCA) was performed. Based in results, the hypothesis was partially corroborated, because the benthic fish populations showedvariations only in each stream interspecific relationship, followed the trend of habitat characteristics and use.