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URI permanente para esta coleçãohttps://locus.ufv.br/handle/123456789/11816

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2016 - 20172

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Assunto: search.filters.subject.Ecological genetics

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Agora exibindo 1 - 2 de 2
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    Morphological and genetic divergence of a small stream fish species along a watershed
    (Biochemical Systematics and Ecology, 2016-10) Resende, Snaydia Viegas; Kavalco, Karine Frehner; Pazza, Rubens
    Piabina argentea is a species of Characidae family that is widely distributed in the hydrographic basins of the São Francisco and Paraná Rivers and in some Atlantic coastal drainages of South America. The genus contains only one other species, which is restricted to the Tietê River headwaters (the Upper Paraná River Basin) and is considered monophyletic within the Stevardiinae subfamily. Despite the apparent morphological conservation of at least six well-structured clades, great genetic distance revealed by DNA barcoding has already been reported. In an attempt to evaluate the effect of the watershed of the two river basins in the Arc of Upper Paranaíba region (Upper Paraná and São Francisco River basins), we analyzed the populations from both basins using mitochondrial DNA sequences and morphometry and constructed a distribution scenario for the species in both basins.
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    Parallel evolution evidenced by molecular data in the banded- tetra (Astyanax fasciatus)
    (Biochemical Systematics and Ecology, 2017-02) Pazza, Rubens; Cruvinel, Letícia Aparecida; Kavalco, Karine Frehner
    Astyanax is well known as a model for developmental biology studies, particularly with regard to Mexico's cave populations. More than 130 species of Astyanax are already known, most of which live in South America. The occurrence of cryptic species and species complexes elucidated by chromosomal and genetic studies demonstrates that the relationship between morphology and molecular evolution is quite complex within this group. In this work, we demonstrate that morphology does not follow the path of vicariant processes observed in Astyanax fasciatus populations, which separated about three million years ago, although molecular data suggests its separation in two species.