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Distribution of a supernumerary chromosome system and aspects of karyotypic evolution in the genus Prochilodus (Pisces, Prochilodontidae)

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Abstract

A cytogenetic study on eight species of the genus Prochilodus, family Prochilodontidae, from different hydrographic basins of Brazil is reported. All species had a diploid number of 2n=54 and NF=108. Supernumerary heterochromatic chromosomes of variable frequency were detected in Prochilodus scrofa and in P. cearensis. To determine the occurrence and frequency of the supernumerary chromosomes in P. scrofa, specimens from different localities belonging to the basin of the Paraná river were analysed. The high karyotypic similarity detected demonstrated that, at least in these eight species, evolution occurred without marked changes in chromosome macrostructure.

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Authors and Affiliations

  1. Departamento de Zootecnia, Faculdade de Medicina Veterinária UFF, Rua Vital Brasil Filho, 64, 24.230, Niteroi, RJ., Brasil

    E. Pauls

  2. Departamento de Ciências Biológicas, Universidade Federal de São Carlos, Caixa Postal 676, 13.560, São Carlos, SP., Brasil

    L. A. C. Bertollo

Authors
  1. E. Pauls
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  2. L. A. C. Bertollo
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Pauls, E., Bertollo, L.A.C. Distribution of a supernumerary chromosome system and aspects of karyotypic evolution in the genus Prochilodus (Pisces, Prochilodontidae). Genetica 81, 117–123 (1990). https://doi.org/10.1007/BF00226450

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  • DOI: https://doi.org/10.1007/BF00226450

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