Fisheries-induced neutral and adaptive evolution in exploited fish populations and consequences for their adaptive potential

Marty L, Dieckmann U, & Ernande B (2015). Fisheries-induced neutral and adaptive evolution in exploited fish populations and consequences for their adaptive potential. Evolutionary Applications 8 (1): 47-63. DOI:10.1111/eva.12220.

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Abstract

Fishing may induce neutral and adaptive evolution affecting life-history traits, and molecular evidence has shown that neutral genetic diversity has declined in some exploited populations. Here we theoretically study the interplay between neutral and adaptive evolution caused by fishing. An individual-based eco-genetic model is devised that includes neutral and functional loci in a realistic ecological setting. In line with theoretical expectations, we find that fishing induces evolution towards slow growth, early maturation at small size, and higher reproductive investment. We show, first, that the choice of genetic model (based on either quantitative genetics or gametic inheritance) influences the evolutionary recovery of traits after fishing ceases. Second, we analyse the influence of three factors possibly involved in the lack of evolutionary recovery: the strength of selection, the effect of genetic drift and the loss of adaptive potential. We find that evolutionary recovery is hampered by an association of weak selection differentials with reduced additive genetic variances. Third, the contribution of fisheries-induced selection to the erosion of functional genetic diversity clearly dominates that of genetic drift only for the traits related to maturation. Together, our results highlight the importance of taking into account population genetic variability in predictions of eco-evolutionary dynamics.

Item Type: Article
Uncontrolled Keywords: fisheries-induced evolution; life-history traits; eco-genetic model; genetic drift; natural selection and contemporary evolution; genetic markers; effective population size; genetic erosion
Research Programs: Evolution and Ecology (EEP)
Bibliographic Reference: Evolutionary Applications; 8(1):47-63 (January 2015)(Published online 15 October 2014)
Depositing User: IIASA Import
Date Deposited: 15 Jan 2016 08:53
Last Modified: 07 Sep 2016 07:54
URI: http://pure.iiasa.ac.at/11523

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