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Appears in Collections:Aquaculture Journal Articles
Peer Review Status: Refereed
Title: Parallel evolution and adaptation to environmental factors in a marine flatfish: Implications for fisheries and aquaculture management of the turbot (Scophthalmus maximus)
Author(s): Prado, Fernanda Dotti do
Vera, Manuel
Hermida, Miguel
Bouza, Carmen
Pardo, Belen G
Vilas, Roman
Blanco, Andres
Fernandez, Carlos
Maroso, Francesco
Maes, Gregory E
Turan, Cemal
Volckaert, Filip A M J
Taggart, John
Carr, Adrian
Ogden, Rob
Keywords: adaptive variation
conservation genetics
population structure
RAD sequencing
Issue Date: 30-Sep-2018
Citation: Prado FDd, Vera M, Hermida M, Bouza C, Pardo BG, Vilas R, Blanco A, Fernandez C, Maroso F, Maes GE, Turan C, Volckaert FAMJ, Taggart J, Carr A & Ogden R (2018) Parallel evolution and adaptation to environmental factors in a marine flatfish: Implications for fisheries and aquaculture management of the turbot (Scophthalmus maximus). Evolutionary Applications, 11 (8), pp. 1322-1341.
Abstract: Unraveling adaptive genetic variation represents, in addition to the estimate of population demographic parameters, a cornerstone for the management of aquatic natural living resources, which, in turn, represent the raw material for breeding programs. The turbot (Scophthalmus maximus) is a marine flatfish of high commercial value living on the European continental shelf. While wild populations are declining, aquaculture is flourishing in southern Europe. We evaluated the genetic structure of turbot throughout its natural distribution range (672 individuals; 20 populations) by analyzing allele frequency data from 755 single nucleotide polymorphism discovered and genotyped by double‐digest RAD sequencing. The species was structured into four main regions: Baltic Sea, Atlantic Ocean, Adriatic Sea, and Black Sea, with subtle differentiation apparent at the distribution margins of the Atlantic region. Genetic diversity and effective population size estimates were highest in the Atlantic populations, the area of greatest occurrence, while turbot from other regions showed lower levels, reflecting geographical isolation and reduced abundance. Divergent selection was detected within and between the Atlantic Ocean and Baltic Sea regions, and also when comparing these two regions with the Black Sea. Evidence of parallel evolution was detected between the two low salinity regions, the Baltic and Black seas. Correlation between genetic and environmental variation indicated that temperature and salinity were probably the main environmental drivers of selection. Mining around the four genomic regions consistently inferred to be under selection identified candidate genes related to osmoregulation, growth, and resistance to diseases. The new insights are useful for the management of turbot fisheries and aquaculture by providing the baseline for evaluating the consequences of turbot releases from restocking and farming.
DOI Link: 10.1111/eva.12628
Rights: © 2018 The Authors. Evolutionary Applications published by John Wiley & Sons Ltd This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
Notes: Additional co-authors: Einar Eg Nielsen, The Aquatrace Consortium, and Paulino Martínez

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