Parallel signatures of selection in temporally isolated lineages of pink salmon

Studying the effect of similar environments on diverse genetic backgrounds has long been a goal of evolutionary biologists with studies typically relying on experimental approaches. Pink salmon, a highly abundant and widely ranging salmonid, provide a naturally occurring opportunity to study the eff...

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Bibliographic Details
Published in:Molecular ecology 2014-05, Vol.23 (10), p.2473-2485
Main Authors: Seeb, L. W., Waples, R. K., Limborg, M. T., Warheit, K. I., Pascal, C. E., Seeb, J. E.
Format: Article
Language:English
Subjects:
Alaska
Animals
Bayes Theorem
Biological Evolution
Evolution & development
Genetic diversity
Genetic Variation
Genotype
genotyping by sequencing
Models, Genetic
parallel selection
pink salmon
Polymorphism, Single Nucleotide
Population genetics
population genomics
RAD
Salmon
Salmon - genetics
Salmonidae
Selection, Genetic
Sequence Analysis, DNA
Spatio-Temporal Analysis
Washington
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Summary:Studying the effect of similar environments on diverse genetic backgrounds has long been a goal of evolutionary biologists with studies typically relying on experimental approaches. Pink salmon, a highly abundant and widely ranging salmonid, provide a naturally occurring opportunity to study the effects of similar environments on divergent genetic backgrounds due to a strict two‐year semelparous life history. The species is composed of two reproductively isolated lineages with overlapping ranges that share the same spawning and rearing environments in alternate years. We used restriction‐site‐associated DNA (RAD) sequencing to discover and genotype approximately 8000 SNP loci in three population pairs of even‐ and odd‐year pink salmon along a latitudinal gradient in North America. We found greater differentiation within the odd‐year than within the even‐year lineage and greater differentiation in the southern pair from Puget Sound than in the northern Alaskan population pairs. We identified 15 SNPs reflecting signatures of parallel selection using both a differentiation‐based method (BAYESCAN) and an environmental correlation method (BAYENV). These SNPs represent genomic regions that may be particularly informative in understanding adaptive evolution in pink salmon and exploring how differing genetic backgrounds within a species respond to selection from the same natural environment.
ISSN:0962-1083
1365-294X
DOI:10.1111/mec.12769