Shape and size variation of Jenynsia lineata (Jenyns 1842) (Cyprinodontiformes: Anablepidae) from different coastal environments

摘要: A key question in ecological speciation is to understand the causes and consequences of phenotypic divergence among populations. In this work, we analyzed body shape size variation Jenynsia lineata across different coastal habitats along Atlantic coast South America. We hypothesized that J. presents morphological variations inhabit contrasting environments these adaptations are sex specific. 13 populations from five habitats, using linear geometric morphometry, tested correlation with environmental variables which factors may influence variation. showed differences populations, specific each sex. While females a caudal peduncle correlated water current, did not find such trait males. Alternatively, individuals marine rocky pools have convex curvature dorsal profile larger sizes, both sexes. With results, describe discuss uncommon habitat-dependent sexual dimorphism Neotropical livebearer fish.