Natural hybridization of two species of tetraploid barbels: Barbus meridionalis and Barbus barbus (Osteichtyes, Cyprinidae) in southern France |
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Authors: | PATRICK BERREBI GHISLAINE CATTANEO-BERREBI NATHALIE LE BRUN |
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Affiliation: | Laboratoire Génome et Populations (URA 1493, CNRS), C.C. 63, UniversitéMontpellier II, USTL, Place E. Bataillon, 34095 Montpellier cedex 05, France;Laboratoire de Parasitologie Comparée (URA 698, CNRS), UniversitéMontpellier II, USTL, Place E. Bataillon, 34095 Montpellier cedex 05, France |
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Abstract: | Natural hybridization of Barbus barbus and B. meridionalis has been demonstrated in southern France. A genetical study (isozyme electrophoresis) of these species and their hybrids revealed the characteristics of hybridization. Ten enzyme markers and five morphological parameters were used to distinguish between the two parent species. Enzymatic divergence between the parent species included fixed allelic differences at certain loci and reduction in enzymatic activity, including the silencing of certain genes. A morphological study revealed a good correlation between the isozyme markers and morphological characters. Backcrosses were observed and this raises the question of the integrity of the parent species. |
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Keywords: | Duplicate gene expression isozymes biometry |
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