A conserved haplotype controls parallel adaptation in geographically distant salmonid populations

Abstract

Salmonid fishes exhibit extensive local adaptations owing to abundant environmental variation and precise natal homing. This extensive local adaptation makes conservation and restoration of salmonids a challenge. For example, defining unambiguous units of conservation is difficult, and restoration attempts often fail owing to inadequate adaptive matching of translocated populations. A better understanding of the genetic architecture of local adaptation in salmonids could provide valuable information to assist in conserving and restoring natural populations of these important species. Here, we use a combination of laboratory crosses and next‐generation sequencing to investigate the genetic architecture of the parallel adaptation of rapid development rate in two geographically and genetically distant populations of rainbow trout ( Oncorhynchus mykiss ). Strikingly, we find that not only is a parallel genetic mechanism used but that a conserved haplotype is responsible for this intriguing adaptation. The repeated use of adaptive genetic variation across distant geographical areas could be a general theme in salmonids and have important implications for conservation and restoration.

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Cited by papers we hold 5

• Genomics clarifies taxonomic boundaries in a difficult species complex. · 2017
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• Aquaculture genomics, genetics and breeding in the United States: current status, challenges, and priorities for future research · 2017
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• Genotyping by sequencing resolves shallow population structure to inform conservation of Chinook salmon ( Oncorhynchus tshawytscha ) · 2014
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• Plastic and evolutionary responses to climate change in fish · 2014
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• Special features of RAD Sequencing data: implications for genotyping · 2012
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