Genetic characterization of striped sea bream (Lithognathus mormyrus) populations on both sides of a boundary area between eastern and western Mediterranean basins

Hammami I., Bahri-Sfar L., Kaouèche M., Ben Hassine O.K.

Date de parution: juin 2007
Volume: 31
Number: 2
Pagination: 133-137
Editeur: Société Française d'Ichtyologie

The allozymic analysis was used to investigate intra-species genetic variability and structure in striped sea bream, Lithognathus mormyrus (Linnaeus, 1758), captured from marine and lagoon localities belonging to the East of Tunisian coasts. Six polymorphic loci were scored among the thirteen loci identified (Est-1, Est-2, Got-2, Mdh-3, Pgm and Sod). The mean number of alleles per locus, the proportion of polymorphic locus and the mean heterozygosity showed the existence of low variability, which was equally distributed among studied samples. An applied test on the four samples showed significant departure from the Hardy-Weinberg equilibrium (ƒ = 0.243; p < 0.001). The interpopulation genetic variability revealed a high degree of genetic homogeneity (Fst = 0.017) and the absence of a North/South differentiation.

Mots-clés: Allozymes - Genetic variability - Lithognathus mormyrus - MED - Siculo-Tunisian strait - Sparidae
PDF visible pour tous