Distribution and morphological diversity of Astyanax rivularis Lütken, 1874 (Teleostei Characiformes) in the upper S?o Francisco River basin, Brazil

摘要

Astyanax S.F. Baird et Girard, 1854 (Teleostei Characiformes) is one of the most well characterizedof the neotropical ichthyofauna and is composed of fish with great ability to adapt todifferent environmental conditions and a wide spectrum of interaction in fish assemblagesdue to its structure and population density. This study presents the geographical distributionand morphological diversity of Astyanax rivularis Lütken, 1874, a fish historically complexand extremely diverse, in tributary streams of the left side of upper S?o Francisco River.