Experimental harvesting of fish populations drives genetically based shifts in body size and maturation

Van Wijk, S.J., Taylor, M.I., Creer, S., Dreyer, C., Rodrigues, F.M., Ramnarine, I.W., Van Oosterhout, C. and Carvalho, G.R. (2013) Experimental harvesting of fish populations drives genetically based shifts in body size and maturation. Frontiers in Ecology & the Environment, 11 (4). pp. 181-187. ISSN 1540-9295

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Abstract

Size-selective harvesting in commercial fisheries can induce rapid changes in biological traits. While experimental and wild harvested populations often exhibit clear shifts in body size and maturation associated with fishing pressure, the relative contributions of genetic and environmental factors to these shifts remain uncertain and have been much debated. To date, observations of so-called fisheries-induced evolution (FIE) have been based solely on phenotypic measures, such as size data. Genetic data are hitherto lacking. Here, we quantify genetic versus environmental change in response to size-selective harvesting for small and large body size in guppies (Poecilia reticulata) across three generations of selection. We document for the first time significant changes at individual genetic loci, some of which have previously been associated with body size. In contrast, variation at neutral microsatellite markers was unaffected by selection, providing direct genetic evidence for rapid evolution induced by size-selective harvesting. These findings demonstrate FIE in an experimental system, with major implications for the sustainability of harvested populations, as well as impacts on size-structured communities and ecosystem processes. These findings highlight the need for scientists and managers to reconsider the capacity of harvested stocks to adapt to, and recover from, harvesting and predation. © 2013 The Ecological Society of America.

Item Type: Article
Faculty \ School: Faculty of Science > School of Biological Sciences
Faculty of Science > School of Environmental Sciences
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Depositing User: Katherine Humphries
Date Deposited: 21 Feb 2013 14:19
Last Modified: 02 Oct 2020 23:27
URI: https://ueaeprints.uea.ac.uk/id/eprint/41483
DOI: 10.1890/120229

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