Loss of genetic integrity in wild lake trout populations following stocking: insights from an exhaustive study of 72 lakes from Québec, Canada
Version of Record online: 15 MAY 2014
© 2014 The Authors. Evolutionary Applications published by John Wiley & Sons Ltd.
This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
Volume 7, Issue 6, pages 625–644, June 2014
How to Cite
Valiquette, E., Perrier, C., Thibault, I. and Bernatchez, L. (2014), Loss of genetic integrity in wild lake trout populations following stocking: insights from an exhaustive study of 72 lakes from Québec, Canada. Evolutionary Applications, 7: 625–644. doi: 10.1111/eva.12160
- Issue online: 27 JUN 2014
- Version of Record online: 15 MAY 2014
- Manuscript Accepted: 17 MAR 2014
- Manuscript Received: 5 NOV 2013
- Natural Sciences and Engineering Research Council of Canada (NSERC)
- Fonds québécois de recherche sur la nature et les technologies (FRQNT)
- Réseau Aquaculture Québec
- Canadian Research Chair in genomics and conservation of aquatic resources
- conservation genetics;
- fisheries management;
- genetic integrity;
- individual assignment;
Stocking represents the most important management tool worldwide to increase and sustain commercial and recreational fisheries in a context of overexploitation. Genetic impacts of this practice have been investigated in many studies, which examined population and individual admixture, but few have investigated determinants of these processes. Here, we addressed these questions from the genotyping at 19 microsatellite loci of 3341 adult lake trout (Salvelinus namaycush) from 72 unstocked and stocked lakes. Results showed an increase in genetic diversity and a twofold decrease in the extent of genetic differentiation among stocked populations when compared to unstocked. Stocked populations were characterized by significant admixture at both population and individual levels. Moreover, levels of admixture in stocked populations were strongly correlated with stocking intensity and a threshold value of total homogenization between source and stocked populations was identified. Our results also suggest that under certain scenarios, the genetic impacts of stocking could be of short duration. Overall, our study emphasizes the important alteration of the genetic integrity of stocked populations and the need to better understand determinants of admixture to optimize stocking strategies and to conserve the genetic integrity of wild populations.