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Cytogenetic and Morphometric Analysis in the Species <I>Astyanax altiparanae</I> Garutti & Britski, 2000 (Teleostei, Characidae) from the Iguatemi River Basin, Brazil

2014; Institute of Systematics and Evolution of Animals, Polish Academy of Sciences; Volume: 62; Issue: 3 Linguagem: Inglês

10.3409/fb62_3.193

1734-9168

Carlos Alexandre Fernandes, Rafael Henrique da Rocha, Dayani Bailly, Zaira da Rosa Guterres, Diandra Soares Alves, Isabel Cristina Martins-Santos,

Fish Biology and Ecology Studies

The genus Astyanax is relatively common and encompasses various similar taxa forming a highly complex group that is difficult to precisely delimit. The present study aims to analyze cytogenetically and morphologically specimens of A. altiparanae belonging to distinct populations of the Iguatemi River Basin, Mato Grosso do Sul State, Brazil, for a better understanding of the evolutionary processes in this fish group. This study analysed 32 specimens of Astyanax altiparanae from Iguatemi River basin, MS, Brazil: 24 from the Agua Boa stream and 8 from the Santa Maria stream. All specimens showed a diploid number equal to 50 chromosomes with differences in the karyotypic formula and types of chromosomes bearing the NOR between the two localities. The constitutive heterochromatin showed interstitial markings evident in the region of some chromosomes in both populations. In the morphometric analysis, the first three axes were retained for interpretation which together explained 81% of variance, showing morphometric distinction between populations. Chromosomal and morphometric data obtained may be useful for taxonomic and phylogenetic studies in this group of fish.