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Environmental factors correlate with hybridization in stocked brook charr (Salvelinus fontinalis)

Marie, Amandine D. and Bernatchez, L. and Garant, D. (2012) Environmental factors correlate with hybridization in stocked brook charr (Salvelinus fontinalis). Canadian Journal of Fisheries and Aquatic Sciences, 69 (5). pp. 884-893. ISSN 0706-652X

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Abstract

Stocking is a common practice throughout the world that may increase hybridization between wild and domesticated populations. Stocking intensity alone does not always fully explain the observed patterns of hybridization, suggesting that the intensity of hybridization may be modulated by environmental factors. Using brook charr (i.e., brook trout, Salvelinus fontinalis) as a model, the objective of this study was to assess the relative effect of environmental factors and stocking intensity on the level of hybridization observed within brook charr from 15 lacustrine populations of two wildlife reserves in Quebec, Canada. The level of hybridization significantly increased with (i) the number of stocking events, (ii) a reduction in both surface area and maximum depth of lakes, and (iii) a reduction in dissolved oxygen and an increase in temperature and pH. These results suggest that levels of hybridization were affected by the availability and quality of lacustrine habitats as well as by the extent of propagule pressure. Our study provides the first demonstration that knowledge of environmental features may help predict the effects of stocking on the genetic integrity of wild populations.

Item Type: Journal Article
Subjects: S Agriculture > SH Aquaculture. Fisheries. Angling
Divisions: Faculty of Science, Technology and Environment (FSTE) > School of Marine Studies
Depositing User: USP RSC Assistant
Date Deposited: 29 Jan 2018 15:19
Last Modified: 29 Jan 2018 15:19
URI: http://repository.usp.ac.fj/id/eprint/10296
UNSPECIFIED

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