%0 Journal Article
%T Morphological variation in populations of Tetragonopterus argenteus Cuvier, 1817 (Characiformes, Characidae) from Madeira and Paraguay river basins Varia  o morfol¨®gica em popula  es de Tetragonopterus argenteus Cuvier, 1817 (Characiformes, Characidae) das bacias dos rios Madeira e Paraguai
%A Oscar Akio Shibatta
%A Willian Massaharu Ohara
%J Semina : Ci¨ºncias Biol¨®gicas e da Sa¨²de
%D 2007
%I Universidade Estadual de Londrina
%X The saua Tetragonopterus argenteus is endemic to South America. It has a wide geographic distribution and occurs in different Brazilian basins, such as those of the Madeira and Paraguay rivers. In this work, it was noticed that populations from these basins have morphological variations between them, indicating a possible geographic isolation. Specimens were studied using twelve morphological characters that were submitted to the canonical variates and body proportion analysis. In the canonical variate analysis, the populations from the Madeira and Paraguay river basins were differentiated by caudal peduncle depth, eye diameter, pre-ventral distance, body height, snout length and head length. In the body proportion analysis, the population of Madeira river basin presented head length, orbital diameter, pre-dorsal distance, dorsal-fin length, pre-ventral distance, body height and caudal peduncle height, smaller than those of the population from Paraguay river basin. These results allowed the recognition of intra-specific variation amplitude, that could become an important instrument for management and conservation of this species. O sau¨¢ Tetragonopterus argenteus ¨¦ end¨ºmico da Am¨¦rica do Sul, apresenta ampla distribui  o geogr¨¢fica e ocorre em v¨¢rias bacias brasileiras, entre elas as dos rios Madeira e Paraguai. Neste trabalho foi observado que as popula  es dessas bacias apresentam varia  es morfol¨®gicas que, provavelmente, representam isolamento geogr¨¢fico. Exemplares foram estudados atrav¨¦s de 12 caracteres morfol¨®gicos e submetidos ¨¤s an¨¢lises de vari¨¢veis can nicas e de propor  es corporais. Na an¨¢lise das vari¨¢veis can nicas, as popula  es das bacias dos rios Madeira e Paraguai diferenciaram-se pelo diametro do olho, distancia pr¨¦-ventral, altura do corpo, comprimento do focinho, altura do ped¨²nculo caudal e comprimento da cabe a. Na an¨¢lise das propor  es corporais, a popula  o da bacia do rio Madeira apresentou comprimento da cabe a, diametro do olho, distancia pr¨¦-dorsal, comprimento da base da nadadeira dorsal, distancia pr¨¦ ventral, altura do corpo e altura do ped¨²nculo caudal, menores que os das popula  es da bacia do rio Paraguai. Esses resultados possibilitam o reconhecimento da amplitude da varia  o intra-espec¨ªfica, que poder¨¢ ser um importante instrumento para o manejo e conserva  o dessa esp¨¦cie de peixe.
%K Regi o Neotropical
%K Peixes
%K Tetragonopterinae
%K Morfometria multivariada
%K End¨ºmico.
%U http://www.uel.br/revistas/uel/index.php/seminabio/article/view/3483