Journal article
Temporally isolated lineages of Pink salmon reveal unique signatures of selection on distinct pools of standing genetic variation
A species’ genetic diversity bears the marks of evolutionary processes that have occurred throughout its history. However, robust detection of selection in wild populations is difficult and often impeded by lack of replicate tests. Here, we investigate selection in pink salmon (Oncorhynchus gorbuscha) using genome scans coupled with inference from a haploid-assisted linkage map.
Pink salmon have a strict 2-year semelparous life history which has resulted in temporally isolated (allochronic) lineages that remain sympatric through sharing of spawning habitats in alternate years. The lineages differ in a range of adaptive traits, suggesting different genetic backgrounds. We used genotyping by sequencing of haploids to generate a high-density linkage map with 7035 loci and screened an existing panel of 8036 loci for signatures of selection.
The linkage map enabled identification of novel genomic regions displaying signatures of parallel selection shared between lineages. Furthermore, 24 loci demonstrated divergent selection and differences in genetic diversity between lineages, suggesting that adaptation in the 2 lineages has arisen from different pools of standing genetic variation.
Findings have implications for understanding asynchronous population abundances as well as predicting future ecosystem impacts from lineage-specific responses to climate change
Language: | English |
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Publisher: | The American Genetic Association |
Year: | 2014 |
Pages: | 741-751 |
ISSN: | 14657333 and 00221503 |
Types: | Journal article |
DOI: | 10.1093/jhered/esu063 |
Adaptation, Physiological Animals Chromosome Mapping Climate Change Female Genetic Linkage Genetic Loci Genetic Variation Genetics, Population Genotype Haploidy Male Molecular adaptation and selection Original Article Salmon climate change haploid life history linkage mapping parallel evolution