Regional environmental pressure influences population differentiation in turbot (Scophthalmus maximus)

Vandamme, S.G., Maes, G.E., Raeymaekers, J.A.M., Cottenie, K., Imsland, A.K., Hellemans, B., Lacroix, G., Mac Aoidh, E., Martinsohn, J.T., Martínez, P., Robbens, J., Vilas, R., and Volckaert, F.A.M. (2014) Regional environmental pressure influences population differentiation in turbot (Scophthalmus maximus). Molecular Ecology, 23 (3). pp. 618-636.

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Abstract

Unravelling the factors shaping the genetic structure of mobile marine species is challenging due to the high potential for gene flow. However, genetic inference can be greatly enhanced by increasing the genomic, geographic or environmental resolution of population genetic studies. Here we investigated the population structure of turbot (Scophthalmus maximus) by screening 17 random and gene-linked markers in 999 individuals at 290 geographical locations throughout the Northeast Atlantic Ocean. A seascape genetics approach with the inclusion of high resolution oceanographic data was used to quantify the association of genetic variation with spatial, temporal and environmental parameters. Neutral loci identified three subgroups: an Atlantic group, a Baltic Sea group and one on the Irish Shelf. The inclusion of loci putatively under selection suggested an additional break in the North Sea, subdividing southern from northern Atlantic individuals. Environmental and spatial seascape variables correlated marginally with neutral genetic variation, but explained significant proportions (respectively 8.7 % and 10.3 %) of adaptive genetic variation. Environmental variables associated with outlier allele frequencies included salinity, temperature, bottom shear stress, dissolved oxygen concentration and depth of the pycnocline. Furthermore, levels of explained adaptive genetic variation differed markedly among basins (3% vs 12% in the North and Baltic Sea, respectively). We suggest that stable environmental selection pressure contributes to relatively strong local adaptation in the Baltic Sea. Our seascape genetic approach using a large number of sampling locations and associated oceanographic data proved useful for the identification of population units as the basis of management decisions.

Item ID: 30704
Item Type: Article (Research - C1)
ISSN: 1365-294X
Keywords: adaptive genetic variation; microsatellite; oceanography; population structure; Scophthalmus maximus; seascape genetics
Date Deposited: 03 Jan 2014 01:07
FoR Codes: 06 BIOLOGICAL SCIENCES > 0604 Genetics > 060411 Population, Ecological and Evolutionary Genetics @ 70%
04 EARTH SCIENCES > 0405 Oceanography > 040501 Biological Oceanography @ 30%
SEO Codes: 83 ANIMAL PRODUCTION AND ANIMAL PRIMARY PRODUCTS > 8302 Fisheries - Wild Caught > 830204 Wild Caught Fin Fish (excl. Tuna) @ 50%
96 ENVIRONMENT > 9608 Flora, Fauna and Biodiversity > 960808 Marine Flora, Fauna and Biodiversity @ 50%
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