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https://locus.ufv.br//handle/123456789/22345
Tipo: | Artigo |
Título: | The karyotypes of the thorny catfishes Wertheimeria maculata Steindachner, 1877 and Hassar wilderi Kindle, 1895 (Siluriformes: Doradidae) and their relevance in doradids chromosomal evolution |
Autor(es): | Dergam, Jorge A. Eler, Eduardo S. Vênere, Paulo C. Paiva, Lı́lian C. Miranda, Gabriela A. Oliveira, Alessandro A. |
Abstract: | We studied the karyotypes of two doradids, the rare and endangered Wertheimeria maculata and a derived Amazonian species, Hassar wilderi. Cytogenetic characterization was assessed using conventional staining (Giemsa), C-banding, and NOR banding. Both species had 2n = 58 chromosomes but differed in their chromosome formulae, 24 m + 14sm + 8st + 12a for W. maculata and 32 m + 16sm + 10st for H. wilderi. In W. maculata heterochromatin was mainly telomeric, and three chromosomes had a fully heterochromatic arm; in H. wilderi heterochromatin was also predominantly telomeric and evident in many more chromosomes. Hassar wilderi also presented one pair of homologues with a fully heterochromatic arm. In both species, nucleolar organizer regions were restricted to one pair of subtelocentric chromosomes. Assuming a basal position for W. maculata, we hypothesized that underlying conserved diploid and NOR-bearing chromosome numbers, chromosomal evolution in doradids has involved pericentric inversions and an increase of heterochromatic blocks. |
Palavras-chave: | Brazilian coastal basins Conservation genetics Cytotaxonomy South American biodiversity |
Editor: | Genetica |
Tipo de Acesso: | Springer Nature Switzerland AG. |
URI: | http://dx.doi.org/10.1007/s10709-006-0023-4 http://www.locus.ufv.br/handle/123456789/22345 |
Data do documento: | 8-Ago-2006 |
Aparece nas coleções: | Artigos |
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artigo.pdf Until 2100-12-31 | texto completo | 234,53 kB | Adobe PDF | Visualizar/Abrir ACESSO RESTRITO |
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