Size reductions and genomic changes within two generations in wild walleye populations: associated with harvest?

Evolutionary Applications
Ella BowlesDylan J Fraser

Abstract

The extent and rate of harvest-induced genetic changes in natural populations may impact population productivity, recovery, and persistence. While there is substantial evidence for phenotypic changes in harvested fishes, knowledge of genetic change in the wild remains limited, as phenotypic and genetic data are seldom considered in tandem, and the number of generations needed for genetic changes to occur is not well understood. We quantified changes in size-at-age, sex-specific changes in body size, and genomic metrics in three harvested walleye (Sander vitreus) populations and a fourth reference population with low harvest levels over a 15-year period in Mistassini Lake, Quebec. We also collected Indigenous knowledge (IK) surrounding concerns about these populations over time. Using ~9,000 SNPs, genomic metrics included changes in population structure, neutral genomic diversity, effective population size, and signatures of selection. Indigenous knowledge revealed overall reductions in body size and number of fish caught. Smaller body size, a small reduction in size-at-age, nascent changes to population structure (population differentiation within one river and homogenization between two others), and signatures of selection bet...Continue Reading

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Citations

Jul 21, 2020·Evolutionary Applications·Anne-Laure FerchaudMaren Wellenreuther
Mar 27, 2021·Ecology and Evolution·Jenni M ProkkolaAnssi Vainikka
Apr 9, 2021·Proceedings of the National Academy of Sciences of the United States of America·Malin L PinskyBastiaan Star

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Methods Mentioned

BETA
genotyping
chips
PCA

Software Mentioned

Perch
OutFlank
PCAdapt
cloudblast
JAGS
fast
rjags
DAPC
blast2go
blast

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