Putting turbot on the map: environmental determinants, philopatry and high dispersal potential shed new light on population structure

Sara Vandamme, Gregory E. Maes, Els Torreele, Johan Robbens, Filip A.M. Volckaert

    Onderzoeksoutput: Hoofdstuk in Boek/Rapport/CongresprocedureC3: Congres abstract

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    Research agrees that major declines in stock status are common, including many flatfish stocks. Despite the large human impact on fish stocks, both directly and indirectly, the source of degradation cannot be understood and successfully controlled, without understanding the behaviour of individuals and their interaction with these changes. In the past few years, many studies have suggested that several mechanisms may explain how population structure evolves in an environment without obvious physical boundaries to gene flow. First of all, currents may be complex and oceanographic eddies and fronts may prevent mixing and diffusion of pelagic larvae. Moreover, hydrodynamic and bathymetric barriers have been shown to influence population structure of some marine organisms. Secondly, as a result of the historical separation of ocean basins and persistent oceanographical constraints, phylogeographical structure may persist. Finally, environmental transitions have also been associated with genetic divergence, suggesting that populations are locally adapted to their native environment.
    Here, we investigate the population structure of turbot at local and microgeographical scales in the northeast Atlantic Ocean. Turbot (Scophthalmus maximus L.) has a broad geographical distribution and distinct ecological preferences. The diversity of life-history strategies across its range offer an opportunity to evaluate their effect on the genetic divergence of populations. We evaluate through spatio-temporal sampling and analysis of EST-markers the subtle structure of turbot. This strategy permits us to make inferences about the evolutionary dynamics of putative adaptive population divergence and provided unique information about the relative importance of various evolutionary and environmental forces at fine geographical scales. Moreover, short-term temporal sampling provided insights into the stability of previously observed regional genetic breaks.
    TitelAbstract Book ICES ASC 2012
    StatusGepubliceerd - sep-2012

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