Detailed insights into pan-European population structure and inbreeding in wild and hatchery Pacific oysters (Crassostrea gigas) revealed by genome-wide SNP data. ...

• Main Authors: Vendrami, David LJ, Houston, Ross D, Gharbi, Karim, Telesca, Luca, Gutierrez, Alejandro P, Gurney-Smith, Helen, Hasegawa, Natsuki, Boudry, Pierre, Hoffman, Joseph I
• Format: Article in Journal/Newspaper
• Language: English
• Published: Wiley 2019
• Subjects: Crassostrea gigas; Pacific oyster; aquaculture; genetic structure; high‐density genotyping array; inbreeding; restriction site‐associated DNA RAD sequencing; single nucleotide polymorphism SNP; Canada; Norway; Pacific; Antarc*; Antarctica
• Online Access: https://dx.doi.org/10.17863/cam.43556; https://www.repository.cam.ac.uk/handle/1810/296509

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 ...