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Population and seascape genomics of a critically endangered benthic elasmobranch, the blue skate Dipturus batis

Delaval, Aur�lien; Frost, Michelle; Bendall, Victoria; Hetherington, Stuart J.; Stirling, David; Hoarau, Galice; Jones, Catherine S.; Noble, Leslie R.

Authors

Aur�lien Delaval

Victoria Bendall

Stuart J. Hetherington

David Stirling

Galice Hoarau

Catherine S. Jones

Leslie R. Noble



Abstract

The blue skate (Dipturus batis) has a patchy distribution across the North-East Atlantic Ocean, largely restricted to occidental seas around the British Isles following fisheries-induced population declines and extirpations. The viability of remnant populations remains uncertain, and could be impacted by continued fishing and bycatch pressure and the projected impacts of climate change. We genotyped 503 samples of D. batis, obtained opportunistically from the widest available geographic range, across 6,350 single nucleotide polymorphisms (SNPs) using a reduced-representation sequencing approach. Genotypes were used to assess the species’ contemporary population structure, estimate effective population sizes, and identify putative signals of selection in relation to environmental variables using a seascape genomics approach. We identified genetic discontinuities between inshore (British Isles) and offshore (Rockall and Faroe Island) populations, with differentiation most pronounced across the deep waters of the Rockall Trough. Effective population sizes were largest in the Celtic Sea and Rockall, but low enough to be of potential conservation concern among Scottish and Faroese sites. Among the 21 candidate SNPs under positive selection was one significantly correlated with environmental variables predicted to be affected by climate change, including bottom temperature, salinity, and pH. The paucity of well annotated elasmobranch genomes precluded us from identifying a putative function for this SNP. Nevertheless, our findings suggest that climate change could inflict a strong selective force upon remnant populations of D. batis, further constraining its already restricted habitat. Furthermore, the results provide fundamental insights on the distribution, behaviour, and evolutionary biology of D. batis in the North-East Atlantic that will be useful for the establishment of conservation actions for this and other critically endangered elasmobranchs.

Journal Article Type Article
Acceptance Date Nov 22, 2021
Online Publication Date Nov 26, 2021
Publication Date 2022-01
Deposit Date Nov 29, 2021
Publicly Available Date Dec 15, 2021
Journal Evolutionary Applications
Print ISSN 1752-4563
Electronic ISSN 1752-4571
Publisher Wiley
Peer Reviewed Peer Reviewed
Volume 15
Issue 1
Pages 78-94
DOI https://doi.org/10.1111/eva.13327
Keywords Blue skate, climate change, conservation, Dipturus batis, population genomics, seascape genomics
Public URL http://researchrepository.napier.ac.uk/Output/2824760

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Population And Seascape Genomics Of A Critically Endangered Benthic Elasmobranch, The Blue Skate Dipturus Batis (903 Kb)
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Publisher Licence URL
http://creativecommons.org/licenses/by/4.0/

Copyright Statement
This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.




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