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The Journal of Heredity 1999:90(6)
© 1999 The American Genetic Association 90:591-596

Genetic study of the Atlantic/Mediterranean transition in sea bass (Dicentrarchus labrax)

M Naciri3, C Lemaire1, P Borsa1,2, and F Bonhomme1,*

1Laboratoire Génome, Populations, Interactions, Université Montpellier II, Sète, France 2Institut de Recherche pour le Développement, France 3Laboratoire de Biologie et Zoologie Générale, Université Mohamed V, Rabat, Morocco *Corresponding author E-mail: bonhomme@univ-montp2.fr

We report on the genetic differentiation among populations of the common (or European) sea bass (Dicentrarchus labrax) from the North Sea, Britanny, Portugal, Morocco, the Alboran Sea, and the western Mediterranean. Based on allele-frequency variation at six microsatellite loci, a distance free inferred from Reynold's coancestry coefficient showed that sea bass populations clustered into two distinct groups of populations, an Atlantic group which includes the Alboran Sea east of Gibraltar Strait, and a western Mediterranean group. While no clear geographical pattern emerged within each of these two entities, the sharp transition led us to postulate that the divide may correspond to the Almeria-Oran oceanographic front. This divide was evidenced by a small but highly significant FST (0.018, P<.001), corresponding at equilibrium to an average effective number of migrants Nm on the order of 14 individuals per generation. We emphasize the idea that the passive retention of larvae on either side of the oceanographic front is not a sufficient explanation for the persistence of this divide.


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