Marine reserves and the evolutionary effects of fishing on size at maturation

Miethe, T., Dytham, C., Dieckmann, U. ORCID:, & Pitchford, J.W. (2010). Marine reserves and the evolutionary effects of fishing on size at maturation. ICES Journal of Marine Science 67 (3) 412-425. 10.1093/icesjms/fsp248.

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Size-selective fishing may induce rapid evolutionary changes in life-history traits such as size at maturation. A major concern is that these changes will reduce population biomass and detrimentally affect yield and recruitment. Although marine reserves have been proposed as a tool for fisheries managemnt, their evolutionary implications have as yet attracted little scrutiny. A simple model is used to investigate whether marine reserves can be expected to mitigate the evolutionary impacts of fishing on maturation size. The adaptive dynamics of size at maturation are analysed based on a stage-sructured population model including size-selective fishing and marine reserves with different retention rates. As has been shown before, imposing greater fishing mortality on the largest individuals promotes an evolutionary change towards smaller maturation size. In the model, protecting part of a fish stock using a marine reserve can prevent such fisheries-induced evolution, and this protection critically depends on the type and extent of movement between the reserve and the fished area. Specifically, although the frequent movement of large adults increases catches of large adult fish outside a marine reserve, it also reduces the reserves effectiveness in preventing fisheries-induced evolution. In contrast, when there is exchange between protected and fished areas through juvenile export alone, a marine reserve can effectively prevent evolution towards smaller maturation size, but does so at the expense of reducing the yield of large adult fish. Differences in the movement behaviour of successive life stages need to be considered for marine reserves, to help make fisheries more sustainable evolutionarily.

Item Type: Article
Uncontrolled Keywords: Connectivity; Fitness; Life-history evolution; Metapopulation; Size-structured model; Spillover
Research Programs: Evolution and Ecology (EEP)
Bibliographic Reference: ICES Journal of Marine Science; 67(3):412-425 (April 2010) (Published online 03 November 2009)
Depositing User: IIASA Import
Date Deposited: 15 Jan 2016 08:44
Last Modified: 27 Aug 2021 17:21

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