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Geographic distribution of the cytotypes and karyotype results indicate that H. malabaricus …


Biology Articles » Biogeography » Cytogenetics and biogeography: considerations about the natural origin of Hoplias malabaricus (Characiformes, Erythrinidae) on the Iguaçu river

Abstract
- Cytogenetics and biogeography: considerations about the natural origin of Hoplias malabaricus (Characiformes, Erythrinidae) on the Iguaçu river

BIOLOGICAL AND APPLIED SCIENCES

Cytogenetics and biogeography: considerations about the natural origin of Hoplias malabaricus (Characiformes, Erythrinidae) on the Iguaçu river

 Marcelo Ricardo VicariI, *; Rubens PazzaI; Roberto Ferreira ArtoniII; Vladimir Pavan MargaridoIII; Luiz Antonio Carlos BertolloI

IUniversidade Federal de São Carlos; Departamento de Genética e Evolução; Via Washington Luís, km 235; C. P. 676; 13565-905; vicarimr@bol.com.br; São Carlos - SP - Brasil
IIUniversidade Estadual de Ponta Grossa; Departamento de Biologia Estrutural; Molecular e Genética; 84030-900; Ponta Grossa - PR - Brasil
IIIUniversidade Estadual do Oeste do Paraná; Centro de Ciências Biológicas e da Saúde; 85814-110; Cascavel - PR - Brasil

Hoplias malabaricus (trahyra) is a widespread fish species over the Neotropical region with diversified inter-populational karyotypes (cytotypes), which may correspond to a species complex. Despite the wide distribution in the South American basins, some authors have questioned its natural origin in the Iguaçu river, an important Brazilian river basin which is characterized by several endemic fish species. We have analyzed the karyotype of H. malabaricus from different collection sites of this river, by conventional and banding methods. Our results, in addition to our previous data concerning geographic distribution of the cytotypes, contribute to better understand the origin of H. malabaricus on the Iguaçu river, reinforcing the proposition that it is a natural fish species in this river basin.

Key words: Chromosome evolution, karyotypes distribution, endemism

Braz. arch. biol. technol. vol.49 no.2  Curitiba Mar. 2006.


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