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Characterisation of genetic structure of Dicentrarchus labrax larvae in two nurseries of the Gulf of Lions (NW Mediterranean)

Published online by Cambridge University Press:  05 April 2008

Bruno Guinand ,
Emilie Dujardin ,
Vincent Dufour  and
Costas S. Tsigenopoulos
Bruno Guinand
Affiliation:
Université Montpellier II, Institut des Sciences de l'Evolution de Montpellier, Biologie intégrative, UMR CNRS 5554, place E. Bataillon, cc63, 34095 Montpellier Cedex 5, France École Pratique des Hautes Études, Station Méditerranéenne de l'Environnement Littoral, quai de la Daurade, 34200 Sète, France
Emilie Dujardin
Affiliation:
Université Montpellier II, Institut des Sciences de l'Evolution de Montpellier, Biologie intégrative, UMR CNRS 5554, place E. Bataillon, cc63, 34095 Montpellier Cedex 5, France
Vincent Dufour
Affiliation:
Université Montpellier II, Institut des Sciences de l'Evolution de Montpellier, Biologie intégrative, UMR CNRS 5554, place E. Bataillon, cc63, 34095 Montpellier Cedex 5, France École Pratique des Hautes Études, Station Méditerranéenne de l'Environnement Littoral, quai de la Daurade, 34200 Sète, France
Costas S. Tsigenopoulos
Affiliation:
Hellenic Centre for Marine Research, Institute of Marine Biology and Genetics, PO Box 2214, Gournes Pediados, 71500 Heraklion, Crete, Greece
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Abstract

Despite extensive knowledge of the genetic structure of sea bass (Dicentrarchus labrax) populations, no studies have investigated genetic structure within early life stages, or compared such structure between such stages and (sub)adults. Using nine newly developed microsatellite loci, we investigated patterns of genetic variation and relatedness among juveniles that settled in two NW Mediterranean nursery grounds in close geographical proximity. There was no evidence for differentiation among samples at settlement (θ = -0.0010), and no significant genetic relatedness. Nevertheless, significant departures from Hardy-Weinberg equilibrium were detected in each sample, which could not be attributed exclusively to the presence of null alleles and to Wahlund effect. These results are compared with and discussed in relation to the genetic structure of adults described in the same area 10 years ago.

Keywords

Population geneticsEuropean sea bassEarly life stagesAdultsNursery ground
Type
Research Article
Information
Aquatic Living Resources , Volume 21 , Issue 1 , January 2008 , pp. 81 - 87
Copyright
© EDP Sciences, IFREMER, IRD, 2008

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