Regional patterns of microsatellite variation in <Emphasis Type="Italic">Mytilus galloprovincialis</Emphasis> from the Iberian Peninsula |
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Authors: | Angel P Diz Pablo Presa |
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Institution: | (1) Faculty of Marine Sciences—ECIMAT, Department of Biochemistry, Genetics and Immunology, University of Vigo, 36310 Vigo, Spain;(2) Department of Genetics, University of Swansea, School of Medicine, Singleton Park, Swansea, SA2 8PP, UK |
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Abstract: | The Almería-Oran Oceanographic Front (AOOF) has been proposed as an effective marine barrier to gene flow between the NE Atlantic
Ocean and the Mediterranean Sea for several species. Previous studies using allozymes and mitochondrial DNA have reported
a scenario of secondary intergradation between populations of Mytilus galloprovincialis from those basins, with the allelic frequencies of some loci showing abrupt clinal patterns across the AOOF. In this study,
we aimed at testing the congruence between six neutral polymorphic microsatellites versus previous data on allozymes and mtDNA-RFLPs,
at depicting the population structure of this species in the Iberian Peninsula. Microsatellite genotyping was scored on 17
samples of mussels collected in the Iberian coast, including some areas not sampled before. Microsatellites exhibited larger
intrabasin diversity (F
SC = 1.72%,
), similar interbasin differentiation (F
CT = 2.81%) and fewer allelic clines than allozymes or mtDNA haplotypes. These results fully support the scenario of secondary
intergradation with some ongoing gene flow between basins, as proposed in previous analyses. Moreover, this congruence between
markers and analyses separated by a 12-year period (1988–2000) confirm the temporal stability of this marine barrier at shaping
the Iberian phylogeographic break in M. galloprovincialis. In addition, the genetic continuity between the NE Atlantic (Portugal) and the Alboran Sea seems to be warranted across the
Gulf of Cadiz and the Gibraltar strait after the present microsatellite data.
Electronic supplementary material The online version of this article (doi:) contains supplementary material, which is available to authorized users. |
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