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Morphological Differentiation and Possible Origin of B Chromosomes in Natural Brazilian Population of Astyanax Scabripinnis (PISCES, CHARACIDAE)

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Abstract

Specimens of Astyanax scabripinnisfrom three different altitudes (1920, 1800 and 700 m) along the Ribeirão Grande stream in the Campos do Jordão region (São Paulo State, Brazil) were investigated. The same diploid number, 2n = 50, was detected in the three populations, with the following karyotypic constitution: 6M, 22SM, 10ST and 12A. The populations located at 1920 and 1800 m altitude presented a high incidence of B chromosomes varying in number (0–2), shape (meta- and submetacentrics), size (large and small) and sex-related frequency (they were more frequent among females). The two morphologically variant B chromosomes probably evolved from a metacentric macrochromosome, which is the most commonly observed B chromosome in several A. scabripinnispopulations.

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Authors and Affiliations

  1. Departamento de Genética e Evolução, Universidade Federal de São Carlos, Rodovia Washington Luis, Km 235, Caixa Postal 676, CEP 13565-905, São Carlos, SP, Brazil

    Daniela Morilha Néo & Luiz Antônio Carlos Bertollo

  2. Departamento de Genética e Evolução, Universidade Federal de São Carlos, Rodovia Washington Luis, Km 235, Caixa Postal 676, CEP 13565-905, São Carlos, SP, Brazil

    Orlando Moreira Filho

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  1. Daniela Morilha Néo
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  2. Luiz Antônio Carlos Bertollo
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  3. Orlando Moreira Filho
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Néo, D.M., Bertollo, L.A.C. & Filho, O.M. Morphological Differentiation and Possible Origin of B Chromosomes in Natural Brazilian Population of Astyanax Scabripinnis (PISCES, CHARACIDAE). Genetica 108, 211–215 (2000). https://doi.org/10.1023/A:1004157901097

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