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Genomic reticulation indicates mixed ancestry in Southern-Hemisphere Mytilus spp. mussels
Borsa, P.; Daguin, C.; Bierne, N. (2007). Genomic reticulation indicates mixed ancestry in Southern-Hemisphere Mytilus spp. mussels. Biol. J. Linn. Soc. 92(4): 747-754
In: Biological Journal of the Linnean Society. Academic Press: London; New York. ISSN 0024-4066, more
Peer reviewed article  

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Keywords
    DNA; Genetic polymorphism; Geographical distribution; Hybridization; Polymorphism (biological); Mytilus edulis Linnaeus, 1758 [WoRMS]; Mytilus galloprovincialis Lamarck, 1819 [WoRMS]; Marine

Authors  Top 
  • Borsa, P.
  • Daguin, C.
  • Bierne, N.

Abstract
    Previous surveys of allozyme variation in smooth-shell Mytilus spp. mussels have reported the presence in the Southern Hemisphere of bothMytilus edulis and Mytilus galloprovincialis mussels. In the present study, nuclear DNA markers mac-1 and Glu-5'/Glu-3', both diagnostic for Northern-Hemisphere M. edulis and M. galloprovincialis, were used to further characterize the nuclear genomes of M. edulis from Kerguelen and M. galloprovincialis from Tasmania. Genomic reticulation was observed, with typical M. edulis allelomorphs fixed in both populations at locus mac-1 whereas, at locus Glu-5'/Glu-3', allelomorphs characteristic of M. galloprovincialis were present in Kerguelen and nearly fixed in Tasmania. Kerguelen mussels had a genome of mixed M. edulis and M. galloprovincialis ancestry without evidence of barriers to merging as shown by Hardy-Weinberg and linkage equilibrium. Tasmanian mussels possessed a predominantlyM. galloprovincialis genomic background introgressed by M. edulis allelomorphs at locus mac-1. Genetic drift superimposed on ancient hybridization and introgression may explain the genomic reticulation observed in both Kerguelen and Tasmanian mussels. There was no evidence of a recent introduction of Northern-Hemisphere M. galloprovincialis or M. edulis to Kerguelen or Tasmania.

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