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Allozymes and nDNA markers show different levels of population differentiation in the mussel Mytilus edulis on British coasts

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Abstract

In order to test the hypothesis that natural selection can be operating on allozymes, six nuclear DNA markers were used to study population structure in six Mytilus edulis (Linnaeus, 1758) populations around the British Isles and the results compared with previous allozyme data from the same (two sites) or very close localities (the other four sites). Allozymes and nDNA markers show significant differentiation between populations at the P < 0.01 level, with the exception of the nDNA marker PLIIa. The results also indicate significant differences (modified version of the Lewontin–Krakauer test) between the two sets of markers which are about one order of magnitude higher for nDNA than for the allozyme loci. The bootstrap analysis was carried out to correct for the possibility that this difference is a sample size artefact. These results are consistent with the operation of balancing selection on allozymes or on loci in linkage disequilibrium with them.

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Acknowledgement

E.P.S. was supported by Grants from the Conselho Nacional de Pesquisas (CNPq)—Brazil and Overseas Research Students Awards Scheme (ORS/CVCP)—UK.

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Correspondence to Edson Pereira Silva.

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Handling editor: C. Sturmbauer

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Silva, E.P., Skibinski, D.O.F. Allozymes and nDNA markers show different levels of population differentiation in the mussel Mytilus edulis on British coasts. Hydrobiologia 620, 25–33 (2009). https://doi.org/10.1007/s10750-008-9612-9

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