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Low effective population size and evidence for inbreeding in an overexploited flatfish, plaice (Pleuronectes platessa L.)
Hoarau, G.; Boon, E.; Jongma, D.N.; Ferber, S.; Palsson, J.; van der Veer, H.W.; Rijnsdorp, A.D.; Stam, W.T.; Olsen, J.L. (2005). Low effective population size and evidence for inbreeding in an overexploited flatfish, plaice (Pleuronectes platessa L.). Proc. - Royal Soc., Biol. Sci. 272: 497-503
In: Proceedings of the Royal Society of London. Series B. The Royal Society: London. ISSN 0962-8452, more
Peer reviewed article  

Available in Authors 

Keywords
    Fishery management; Flatfish fisheries; Inbreeding; Marine fish; Plaice; Satellite sensing; Pleuronectes platessa Linnaeus, 1758 [WoRMS]; ANE, North Sea [Marine Regions]; Marine

Authors  Top 
  • Hoarau, G.
  • Boon, E.
  • Jongma, D.N.
  • Ferber, S.
  • Palsson, J.
  • van der Veer, H.W.
  • Rijnsdorp, A.D., more
  • Stam, W.T., more
  • Olsen, J.L., more

Abstract
    Overexploitation and subsequent collapse of major worldwide fisheries has made it clear that marine stocks are not inexhaustible. Unfortunately, the perception remains that marine fishes are resilient to large population reductions, as even a commercially ‘collapsed’ stock will still consist of millions of individuals. Coupled with this notion is the idea that fisheries can, therefore, have little effect on the genetic diversity of stocks. We used DNA from archived otoliths collected between 1924 and 1972 together with 2002 juvenile's tissue to estimate effective population size (Ne) in plaice (Pleuronectes platessa). Ne was estimated at 20000 in the North Sea and 2000 in Iceland. These values are five orders of magnitude smaller than the estimated census size for the two locations. Populations examined between 1924 and 1960 were in Hardy-Weinberg equilibrium, whereas populations examined after approximately 1970 were not. Extensive testing was performed to rule out genotyping artefacts and Wahlund effects. The significant heterozygote deficiencies found from 1970 onward were attributed to inbreeding. The emergence of inbreeding between 1950 and 1970 coincides with the increase in fishing mortality after World War II. Although the biological mechanisms remain speculative, our demonstration of inbreeding signals the need for understanding the social and mating behaviour in commercially important fishes.

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