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Genetic differentiation of Diplodus sargus (Pisces: Sparidae) populations in the south-west Mediterranean

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Allozyme analysis of tissue samples of 1249 white sea bream Diplodus sargus from five localities of the south-west Mediterranean revealed a high degree of genetic polymorphism. The observed heterozygosity ranged from 0.4182 (Cape of Palos) to 0.3138 (Tabarca). Several populations were characterized by unique alleles. Examination of the spatial structure was performed using Nei's distances and F-statistics, and indicated genetic differences between groups. One group, which clustered Tabarca and Guardamar, could be explained by the small geographical distance between them. Mazarrón and Cape of Palos samples showed genetic divergence from other samples (Guardamar, Tabarca and Águilas) and this difference may be as a result of local current systems and larval dispersal. © 2004 The Linnean Society of London, Biological Journal of the Linnean Society, 2004, 82, 249–261.
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Keywords: Mediterranean Sea; allozyme; gene pool; genetic structure

Document Type: Research Article

Affiliations: 1: Departamento de Ecología e Hidrología. Facultad de Biología, Universidad de Murcia, Campus de Espinardo, 30100 Murcia, Spain 2: Ecole Pratique des Hautes Etudes-ESA CNRS (8046), Laboratoire d’Ichtyoécologie, Tropicale et Méditerranéenne, Université de Perpignan, F-66860 Perpignan cedex, France

Publication date: 2004-06-01

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