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The evolutionary pressure from fishing on size at maturation of Baltic cod

Author

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  • Andersen, K.H.
  • Farnsworth, K.D.
  • Thygesen, U.H.
  • Beyer, J.E.

Abstract

Recent observations suggest fishing pressure is driving the evolution of smaller female maturation size in some fish stocks. We construct a general size-based theoretical framework to derive the rate and ultimate destination of this evolution based on life-history, community ecology and evolutionary theory. For Baltic cod (Gadus morhua), we find a maximum evolutionary rate of approximately −36 g/generation (−0.072 Haldanes) and optimum maturation size <250 g (mean≈50 g). Whilst this is consistent with many previous observations, it is substantially less than observed in rapidly declining cod stocks, suggesting additional evolutionary processes may affect them. Analysis of management remedies finds only an effective ban on fishing will halt the evolution. Unable to maximise fitness, the fish will remain under evolutionary stress for the foreseeable future.

Suggested Citation

  • Andersen, K.H. & Farnsworth, K.D. & Thygesen, U.H. & Beyer, J.E., 2007. "The evolutionary pressure from fishing on size at maturation of Baltic cod," Ecological Modelling, Elsevier, vol. 204(1), pages 246-252.
    • Handle: RePEc:eee:ecomod:v:204:y:2007:i:1:p:246-252
    DOI: 10.1016/j.ecolmodel.2007.01.002
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    References listed on IDEAS

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    1. Geoffrey B. West & James H. Brown & Brian J. Enquist, 2001. "A general model for ontogenetic growth," Nature, Nature, vol. 413(6856), pages 628-631, October.
    2. Esben M. Olsen & Mikko Heino & George R. Lilly & M. Joanne Morgan & John Brattey & Bruno Ernande & Ulf Dieckmann, 2004. "Maturation trends indicative of rapid evolution preceded the collapse of northern cod," Nature, Nature, vol. 428(6986), pages 932-935, April.
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    Cited by:

    1. Cabral, Reniel B. & Aliño, Porfirio M. & Lim, May T., 2013. "A coupled stock-recruitment-age-structured model of the North Sea cod under the influence of depensation," Ecological Modelling, Elsevier, vol. 253(C), pages 1-8.
    2. Andersen, K.H. & Beyer, J.E. & Pedersen, M. & Andersen, N.G. & Gislason, H., 2008. "Life-history constraints on the success of the many small eggs reproductive strategy," Theoretical Population Biology, Elsevier, vol. 73(4), pages 490-497.
    3. Kuparinen, Anna & Björklund, Mats, 2011. "Theory put into practice: An R implementation of the infinite-dimensional model," Ecological Modelling, Elsevier, vol. 222(12), pages 2027-2030.
    4. dos Santos, R.V.R. & Martins, S.G.F. & Pompeu, P.S., 2012. "An individual-based model for evolutionary effects of selective fishing applied to Pseudoplatystoma corruscans," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 391(21), pages 5112-5120.

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