Detailed insights into pan-European population structure and inbreeding in wild and hatchery Pacific oysters (Crassostrea gigas) revealed by genome-wide SNP data
|Author(s)||Vendrami David L. J.1, Houston Ross D.2, 3, Gharbi Karim4, Telesca Luca5, 6, Gutierrez Alejandro P.2, 3, Gurney-Smith Helen7, Hasegawa Natsuki8, Boudry Pierre9, Hoffman Joseph I.1, 6|
|Affiliation(s)||1 : Bielefeld Univ, Dept Anim Behav, Bielefeld, Germany.
2 : Univ Edinburgh, Roslin Inst, Edinburgh, Midlothian, Scotland.
3 : Univ Edinburgh, Royal Dick Sch Vet Studies, Edinburgh, Midlothian, Scotland.
4 : Univ Edinburgh, Ashworth Labs, Edinburgh Genom, Edinburgh, Midlothian, Scotland.
5 : Univ Cambridge, Dept Earth Sci, Cambridge, England.
6 : British Antarctic Survey, Cambridge, England.
7 : Vancouver Isl Univ, Dept Fisheries & Aquaculture, Nanaimo, BC, Canada.
8 : Japan Fisheries Res Agcy, Natl Res Inst Aquaculture, Minamiise, Japan.
9 : UBO, CNRS, IRD, Ifremer,Lab Sci Environm Marin, Plouzane, France.
|Source||Evolutionary Applications (1752-4571) (Wiley), 2019-03 , Vol. 12 , N. 3 , P. 519-534|
|WOS© Times Cited||23|
|Keyword(s)||aquaculture, Crassostrea gigas, genetic structure, high-density genotyping array, inbreeding, Pacific oyster, restriction site-associated DNA (RAD) sequencing, single nucleotide polymorphism (SNP)|
Cultivated bivalves are important not only because of their economic value, but also due to their impacts on natural ecosystems. The Pacific oyster (Crassostrea gigas) is the world's most heavily cultivated shellfish species and has been introduced to all continents except Antarctica for aquaculture. We therefore used a medium-density single nucleotide polymorphism (SNP) array to investigate the genetic structure of this species in Europe, where it was introduced during the 1960s and has since become a prolific invader of coastal ecosystems across the continent. We analyzed 21,499 polymorphic SNPs in 232 individuals from 23 localities spanning a latitudinal cline from Portugal to Norway and including the source populations of Japan and Canada. We confirmed the results of previous studies by finding clear support for a southern and a northern group, with the former being indistinguishable from the source populations indicating the absence of a pronounced founder effect. We furthermore conducted a large-scale comparison of oysters sampled from the wild and from hatcheries to reveal substantial genetic differences including significantly higher levels of inbreeding in some but not all of the sampled hatchery cohorts. These findings were confirmed by a smaller but representative SNP dataset generated using restriction site-associated DNA sequencing. We therefore conclude that genomic approaches can generate increasingly detailed insights into the genetics of wild and hatchery produced Pacific oysters.