A putative structural variant and environmental variation associated with genomic divergence across the Northwest Atlantic in Atlantic Halibut

Tony Kess* (Corresponding Author), Anthony Einfeldt, Brendan Wringe, Sarah Lehnert, Kara Layton, Meghan McBride, Dominique Robert, Jonathan Fisher, Arnault Le Bris, Cornelia den Heyer, Nancy Shackell, Daniel Ruzzante, Paul Bentzen, Ian R. Bradbury

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

Characterizing the nature of genetic differentiation among individuals and populations and its distribution across the genome is increasingly important to inform both conservation and management of exploited species. Atlantic Halibut (Hippoglossus hippoglossus) is an ecologically and commercially important fish species, yet knowledge of population structure and genomic diversity in this species remains lacking. Here, we use restriction-site associated DNA sequencing and a chromosome-level genome assembly to identify over 86 000 single nucleotide polymorphisms mapped to 24 chromosome-sized scaffolds, genotyped in 734 individuals across the Northwest Atlantic. We describe subtle but significant genome-wide regional structuring between the Gulf of St. Lawrence and adjacent Atlantic continental shelf. However, the majority of genetic divergence is associated with a large putative chromosomal rearrangement (5.74 megabases) displaying high differentiation and linkage disequilibrium, but no evidence of geographic variation. Demographic reconstructions suggest periods of expansion coinciding with glacial retreat, and more recent declines in Ne. This work highlights the utility of genomic data to identify multiple sources of genetic structure and genomic diversity in commercially exploited marine species.
Original languageEnglish
Pages (from-to)2371–2384
Number of pages14
JournalICES Journal of Marine Science
Volume78
Issue number7
Early online date1 Aug 2021
DOIs
Publication statusPublished - Oct 2021

Keywords

  • adaptation
  • climate change
  • conservation
  • genomics
  • structural variation

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