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B-chromosome frequency stability in Prochilodus lineatus (Characiformes, Prochilodontidae)

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Abstract

The genus Prochilodus includes individuals ranging in size from medium to large, being highly relevant for commercial and subsistence fishing. Prochilodus species have a diploid number of 2n = 54 chromosomes and up to seven supernumerary (B) microchromosomes. Previous research has shown that B frequency increased drastically in the Mogi-Guaçu river population of Prochilodus lineatus in the early 1980s, whereas it remained about constant in the 1990s. Here we analyses B frequency in this population during the 2003–2007 period and have found that frequency has not changed significantly since 1987, and that these B chromosomes do not show the intra-individual variation in number that characterized them in the 1980s. This indicates that these B chromosomes have been neutralized, after their invasion, through their mitotic stabilization.

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Acknowledgments

F.P.F. was supported by a fellowship from Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP). This work was supported by grants from Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP).

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Authors and Affiliations

  1. Departamento Ciências Biológicas, Faculdade de Ciências, Universidade Estadual Paulista (UNESP), Campus de Bauru, Av. Engenheiro Luiz Edmundo C. Coube, s/n, Bauru, SP, 17033-360, Brazil

    Tatiana Aparecida Voltolin, Jehud Bortolozzi & Fabio Porto-Foresti

  2. Departamento de Morfologia, Instituto de Biociências, Universidade Estadual Paulista (UNESP), Campus de Botucatu, Botucatu, SP, 18618-000, Brazil

    Claudio Oliveira & Fausto Foresti

  3. Instituto Chico Mendes de Conservação da Biodiversidade, Centro Nacional de Pesquisa e Conservação de Peixes Continentais, CEPTA/ICMBIO, Pirassununga, São Paulo, Brazil

    José Augusto Senhorini

Authors
  1. Tatiana Aparecida Voltolin
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  2. José Augusto Senhorini
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  3. Claudio Oliveira
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  4. Fausto Foresti
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  5. Jehud Bortolozzi
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  6. Fabio Porto-Foresti
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Correspondence to Fabio Porto-Foresti.

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Voltolin, T.A., Senhorini, J.A., Oliveira, C. et al. B-chromosome frequency stability in Prochilodus lineatus (Characiformes, Prochilodontidae). Genetica 138, 281–284 (2010). https://doi.org/10.1007/s10709-009-9420-9

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  • DOI: https://doi.org/10.1007/s10709-009-9420-9

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