Intraspecific mitogenomics of three marine species-at-risk: Atlantic, spotted, and northern wolffish ( Anarhichas spp.)

High-resolution mitogenomics of within-species relationships can answer such phylogeographic questions as how species survived the most recent glaciation, as well as identify contemporary factors such as physical barriers, isolation, and gene flow. We examined the mitogenomic population structure of...

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Bibliographic Details
Published in:Genome
Main Authors: Lait, Linda A., Carr, Steven M.
Other Authors: Bonen, L.
Format: Article in Journal/Newspaper
Language:English
Published: Canadian Science Publishing 2018
Subjects:
Online Access:http://dx.doi.org/10.1139/gen-2018-0043
http://www.nrcresearchpress.com/doi/full-xml/10.1139/gen-2018-0043
http://www.nrcresearchpress.com/doi/pdf/10.1139/gen-2018-0043
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Summary:High-resolution mitogenomics of within-species relationships can answer such phylogeographic questions as how species survived the most recent glaciation, as well as identify contemporary factors such as physical barriers, isolation, and gene flow. We examined the mitogenomic population structure of three at-risk species of wolffish: Atlantic (Anarhichas lupus), spotted (A. minor), and northern (A. denticulatus). These species are extensively sympatric across the North Atlantic but exhibit very different life history strategies, a combination that results in concordant and discordant patterns of genetic variation and structure. Wolffish haplogroups were not structured geographically: Atlantic and spotted wolffish each comprised three shallow clades, whereas northern wolffish comprised two deeper but unstructured lineages. We suggest that wolffish species survived in isolation in multiple glacial refugia, either refugia within refugia (Atlantic and spotted wolffish) or more distant refugia (northern wolffish), followed by secondary admixture upon post-glacial recolonisation of the North Atlantic.