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Chromosomal evidence of population subdivision in the freshwater fish Leporinus elongatus in the Upper Paraná River basin 74
Molina,Wagner Franco; Shibatta,Oscar; Galetti Jr.,Pedro Manoel.
Cytogenetic analyses performed in populations of the Neotropical freshwater fish Leporinus elongatus of the Upper Paraná River basin showed a chromosome polymorphism involving heterochromatic segments of the nucleolar organizing pair in this species. The NOR-bearing chromosome pair was characterized by two phenotypes identified by the absence (C¹) or presence (C²) of a heterochromatic segment located in an interstitial position of the long arm in this pair. The meiotic segregation of these variations results in three distinct cytotypes, C¹C¹, C¹C² and C²C². Both populations were in Hardy-Weinberg equilibrium. Sex-related cytotype divergence was identified and multivariate analyses revealed that the C²C² individuals presented morphometric differentiation...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Characiformes; Anostomidae; Heterochromatin; Chromosome polymorphism.
Ano: 2008 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572008000200020
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