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Subtle genetic differentiation in a high gene flow marine species (Pomatoschistus minutus) living in a dynamic environment
Pampoulie, C.; Gysels, E.S.; Hellemans, B.; Maes, G.E.; Leentjes, V.; Jones, A.G.; Volckaert, F.A.M.J. (2003). Subtle genetic differentiation in a high gene flow marine species (Pomatoschistus minutus) living in a dynamic environment, in: Hogere trofische niveaus in de Zuidelijke Noordzee 'TROPHOS': wetenschappelijk verslag voor de periode van 01/02/2002-31/01/2003. pp. 18-47

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  • Pampoulie, C.
  • Gysels, E.S., meer
  • Hellemans, B., meer
  • Maes, G.E., meer
  • Leentjes, V.
  • Jones, A.G.
  • Volckaert, F.A.M.J., meer

    We assessed genetic differentiation and diversity in 15 populations of sand goby (Pomatoschistus minutus) within the Southern Bight of the North Sea, using seven microsatellite and thirteen allozyme loci. While no significant differentiation was observed with allozymes, microsatellite loci revealed a moderate level of differentiation (overall FST=0.026; overall RST=0.058). The hierarchical analysis of molecular variance revealed a significant differentiation (p<0.01) between Oosterschelde, Westerschelde, coastal and offshore samples with microsatellites but not with allozymes. This structure was confirmed by multidimensional scaling analysis based on Nei and µ² genetic distances. The comparison of the different estimators (FST and RST) of differentiation lead us to conclude that this genetic structure was mainly due to an historical event, namely colonisation of the estuary during its establishment, and to restricted actual gene flow. Therefore, using all of these loci, we found that the 15 natural populations of the sand goby can be clustered into two different breeding units, namely the Oosterschelde and coastal populations. Despite this clear distinction, there were indications of an actual complex dynamic local structure that would bear further examination to understand the processes involved in the differentiation of these two breeding units.

  • Populatiestructuur en verspreiding in de Noordzee van Pomatoschistus grondels, meer

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