Changes in the genetic structure of Atlantic salmon populations over four decades reveal substantial impacts of stocking and potential resiliency
| Type | Article | ||||||||
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| Date | 2013-07 | ||||||||
| Language | English | ||||||||
| Author(s) | Perrier Charles1, 2, 3, 4, Guyomard Rene4, Bagliniere Jean-Luc2, 3, Nikolic Natacha5, Evanno Guillaume2, 3 | ||||||||
| Affiliation(s) | 1 : Univ Laval, Inst Biol Integrat & Syst, Quebec City, PQ G1K 7P4, Canada. 2 : INRA, UMR Ecol & Hlth Ecosyst 0985, F-35042 Rennes, France. 3 : Agrocampus Ouest, F-35042 Rennes, France. 4 : INRA, UMR Genet Anim & Biol Integrat 1313, F-78350 Jouy En Josas, France. 5 : IFREMER, Le Port 97822, Reunion. |
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| Source | Ecology And Evolution (2045-7758) (Wiley-blackwell), 2013-07 , Vol. 3 , N. 7 , P. 2334-2349 | ||||||||
| DOI | 10.1002/ece3.629 | ||||||||
| WOS© Times Cited | 43 | ||||||||
| Keyword(s) | Conservation, population genetics, Salmo salar, stocking, temporal stability | ||||||||
| Abstract | While the stocking of captive-bred fish has been occurring for decades and has had substantial immediate genetic and evolutionary impacts on wild populations, its long-term consequences have only been weakly investigated. Here, we conducted a spatiotemporal analysis of 1428 Atlantic salmon sampled from 1965 to 2006 in 25 populations throughout France to investigate the influence of stocking on the neutral genetic structure in wild Atlantic salmon (Salmo salar) populations. On the basis of the analysis of 11 microsatellite loci, we found that the overall genetic structure among populations dramatically decreased over the period studied. Admixture rates among populations were highly variable, ranging from a nearly undetectable contribution from donor stocks to total replacement of the native gene pool, suggesting extremely variable impacts of stocking. Depending on population, admixture rates either increased, remained stable, or decreased in samples collected between 1998 and 2006 compared to samples from 1965 to 1987, suggesting either rising, long-lasting or short-term impacts of stocking. We discuss the potential mechanisms contributing to this variability, including the reduced fitness of stocked fish and persistence of wild locally adapted individuals. | ||||||||
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