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- Title
Disentangling stocking introgression and natural migration in brown trout: survival success and recruitment failure in populations with semi-supportive breeding J. Wollebæk et al. Stocking introgression and natural migration.
- Authors
WOLLEBÆK, JENS; HEGGENES, JAN; RØED, KNUT H
- Abstract
1. Introgression into natural salmonid populations from stocked conspecifics has been widely studied. Outcomes vary from no effect even after decades of stocking, to population replacement after only a couple of generations. Potential introgression caused by semi-supportive breeding (i.e. using a mixture of local strains as brood stock) is, however, less well studied. 2. We investigated population structure of brown trout ( Salmo trutta) in a regulated alpine lake with three natural, environmentally contrasting tributaries used as spawning and rearing habitat. Massive semi-supportive breeding of admixed local strains has been implemented for decades. Stocked trout represented c. 17% of the total lake population, and a substantial post-release survival reflects a considerable potential for introgression. However, the mark-recapture studies indicate no spawning runs of stocked fish. 3. Using 13 polymorphic microsatellite loci, we found natural straying and non-native reproduction, especially among wild populations inhabiting environmentally unstable habitat. Retained genetic structure across tributaries indicated low reproductive success of wild-born non-natives. Moreover, the genetic structure among tributaries has probably not been influenced by semi-supportive breeding, because of recruitment failure of stocked trout.
- Subjects
BROWN trout; SALMONIDAE; BREEDING; HABITATS; MICROSATELLITE repeats
- Publication
Freshwater Biology, 2010, Vol 55, Issue 12, p2626
- ISSN
0046-5070
- Publication type
Article
- DOI
10.1111/j.1365-2427.2010.02485.x