Borsa Philippe auteur aut IRD Daguin C. auteur aut IRD Bierne N. auteur aut IRD text journalArticle eng text/pdf born digital access Previous surveys of allozyme variation in smooth-shell Mytilus spp. mussels have reported the presence in the Southern Hemisphere of both Mytilus 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 predominantly M. 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. specialized antitropical distribution geographical structure hybridization introgression intron length polymorphism nuclear DNA 034 020 92 4 747-754 2007 0024-4066 https://www.documentation.ird.fr/hor/fdi:010040877 10.1111/j.1095-8312.2007.00917.x 0024-4066 [F B010040877] https://www.documentation.ird.fr/hor/fdi:010040877 https://www.documentation.ird.fr/intranet/publi/2008/01/010040877.pdf Accès réservé (Intranet de l'IRD) IRD - Base Horizon / Pleins textes 2008-02-22 2017-08-23 fdi:010040877 fre