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- Title
Loss of SNP genetic diversity following population collapse in a recreational walleye (Sander vitreus) fishery.
- Authors
Allen, Brandon E.; Bowles, Ella; Morris, Matthew R.J.; Rogers, Sean M.
- Abstract
Walleye (Sander vitreus) are in demand as a commercially and recreationally harvested freshwater fish in Canada. Managed populations may exhibit different phenotypic and genetic signatures from their natural counterparts. In Alberta, Canada, this fishery is recovering from population collapses attributed to intensive recreational angling. We hypothesized that historical population collapses would be associated with signatures of reduced genetic diversity. To address this question, we sampled six walleye lakes in northern Alberta, including historical tissue samples for one population, and used genotyping-by-sequencing to characterize 1081 single nucleotide polymorphisms (SNPs). Lakes were identified as unique genetic clusters except for two lakes that unexpectedly exhibited signs of genetic clustering. Using historical DNA samples, 428 homologous SNPs characterized in walleye between pre- and postpopulation collapse exhibited significant reductions in multiple estimates of genetic diversity. Collectively, our results illustrate that genotype-by-sequencing methods that integrate historical and contemporary samples in association with managed populations provide insight into the consequences of harvest pressure causing collapse.
- Subjects
BIODIVERSITY; WALLEYE (Fish); WALLEYE fishing; FISH genetics; ENDANGERED species
- Publication
Canadian Journal of Fisheries & Aquatic Sciences, 2018, Vol 75, Issue 10, p1644
- ISSN
0706-652X
- Publication type
Article
- DOI
10.1139/cjfas-2017-0164