Data/hora: 10/06/2024 06:34:59

Provedor de dados: | Neotropical Ichthyology
País: | Brazil
Título: | Cytogenetic and comparative morphology of two allopatric populations of Astyanax altiparanae Garutti &amp;amp; Britski, 2000 (Teleostei: Characidae) from upper rio Paraná basin
Autores: | Domingues,Manoela de S.; Vicari,Marcelo R.; Abilhoa,Vinícius; Wamser,João P.; Cestari,Marta M.; Bertollo,Luiz A. C.; Almeida,Mara C. de; Artoni,Roberto F.
Data: | 2007-03-01
Ano: | 2007
Palavras-chave: | Tetra; Karyotype evolution; Distribution; Morphometry.
Resumo: | The recently described fish species, Astyanax altiparanae (tetra) is common in the upper rio Paraná basin, and has been reported in the Iguaçu basin. However, its natural origin in the rio Iguaçu is questionable. In the present work, karyotypical and morphological features of two populations of Astyanax altiparanae from the upper rio Tibagi and upper rio Iguaçu were compared. Both populations showed 2n=50 chromosomes and differences in their karyotype formula, NOR-bearing chromosomes and location of heterochromatin. Morphometric data from both populations were analyzed through free-size canonical variables. Cytogenetic and morphological results were mostly coincident showing exclusive markers that reflect their degree of populational isolation. In addition to other geographic, morphological and molecular data for A. altiparanae populations from the lower rio Iguaçu and rio Paraná tributaries upstream from the Itaipu Dam (South Brazil), the present results indicate that the two populations analyzed in this study belong to different stocks. The presence of this species along the rio Iguaçu basin would be a consequence of a complex and poorly understood evolutionary history.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252007000100005
Editor: | Sociedade Brasileira de Ictiologia
Relação: | 10.1590/S1679-62252007000100005
Formato: | text/html
Fonte: | Neotropical Ichthyology  v.5 n.1 2007
Fonte: | info:eu-repo/semantics/openAccess