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Genetic structure of brown trout (Salmo trutta, L.) populations from south-western France: data from mitochondrial control region variability

Authors

  • D. Aurelle,

    1. Laboratoire Génome et Populations, CNRS UPR 9060, Université Montpellier II, France
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  • P. Berrebi

    Corresponding author
    1. Laboratoire Génome et Populations, CNRS UPR 9060, Université Montpellier II, France
      P. Berrebi. *Present address: ERS 2011 ‘Ecosystèmes Lagunaires’, Equipe ‘Ecologie fonctionnelle et évolutive des poissons’, Université Montpellier II, CP 093, Place E. Bataillon, 34095 Montpellier Cedex 5, France. Fax: +334 67 14 37 19; E-mail:berrebi@crit.univ-montp2.fr
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P. Berrebi. *Present address: ERS 2011 ‘Ecosystèmes Lagunaires’, Equipe ‘Ecologie fonctionnelle et évolutive des poissons’, Université Montpellier II, CP 093, Place E. Bataillon, 34095 Montpellier Cedex 5, France. Fax: +334 67 14 37 19; E-mail:berrebi@crit.univ-montp2.fr

Abstract

The genetic relationships between several French Atlantic populations of brown trout were analysed using polymerase chain reaction–single-strand conformation polymorphism and sequencing of two parts of the mitochondrial control region. Ten mitochondrial haplotypes were identified, separated by a small number of mutations. The distribution of these haplotypes confirmed our hypothesis of the existence of two genetically well-differentiated groups of populations in this area, which has already been suggested using nuclear markers. Nuclear and mitochondrial markers, however, show different patterns of genetic differentiation: some populations which belong to one group according to allozyme results appear to be part of the other when using mitochondrial DNA. The origin of these different forms is discussed; they seem to belong to the Atlantic grouping. Nevertheless, the hypothesis of an ancestral and a modern form suggested for northern populations does not appear valid in this particular case.

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