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Genetica

, 130:99 | Cite as

The karyotypes of the thorny catfishes Wertheimeria maculata Steindachner, 1877 and Hassar wilderi Kindle, 1895 (Siluriformes: Doradidae) and their relevance in doradids chromosomal evolution

  • Eduardo S. Eler
  • Jorge A. Dergam
  • Paulo C. Vênere
  • Lílian C. Paiva
  • Gabriela A. Miranda
  • Alessandro A. Oliveira
Brief Report

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.

Keywords

Brazilian coastal basins Conservation genetics Cytotaxonomy South American biodiversity 

Notes

Acknowledgements

The authors wish to thank two anonymous reviewers for helpful comments, Silvia G. Pompolo for using her image processing lab, and Claudio Oliveira for allowing access to his Neotropical fish database. Emily Toriani corrected the final English version. This work was partially supported by CNPq, Universidade Federal de Viçosa, and Fundação de Amparo a Pesquisa de Mato Grosso/FAPEMAT.

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Copyright information

© Springer Science+Business Media B.V. 2006

Authors and Affiliations

  • Eduardo S. Eler
    • 1
  • Jorge A. Dergam
    • 2
  • Paulo C. Vênere
    • 3
  • Lílian C. Paiva
    • 2
  • Gabriela A. Miranda
    • 2
  • Alessandro A. Oliveira
    • 2
  1. 1.Genética, Conservação e Biologia Evolutiva – Instituto Nacional de Pesquisas da AmazôniaManausBrazil
  2. 2.Departamento de Biologia AnimalUniversidade Federal de ViçosaViçosaBrazil
  3. 3.Departamento de Ciências Biológicas e da SaúdeInstituto de Ciências e Letras do Médio Araguaia, Universidade Federal de Mato GrossoPontal do AraguaiaBrazil

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