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Stepping up to genome scan allows stock differentiation in the worldwide distributed blue shark Prionace glauca
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  • Natacha Nikolic,
  • Floriaan Devloo-Delva,
  • Diane Bailleul,
  • Ekaterina Noskova,
  • Clément Rougeux,
  • Chrystelle Delord,
  • Philippe Borsa,
  • Cathy Liautard-Haag,
  • Mohamed Hassan,
  • Amandine Marie,
  • Pierre Feutry,
  • Peter Grewe,
  • Campbell Davies,
  • Jessica Farley,
  • Daniel Fernando,
  • Sebastian Biton-Porsmoguer,
  • François Poisson,
  • Denham Parker,
  • Agostino Leone,
  • Jorden Aulich,
  • Matt Lansdell,
  • Francis Marsac,
  • Sophie Arnaud-Haond
Natacha Nikolic
INRAE

Corresponding Author:natachanikolic@hotmail.com

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Floriaan Devloo-Delva
Commonwealth Scientific and Industrial Research Organisation
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Diane Bailleul
INRAE
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Ekaterina Noskova
Sankt Peterburgskij nacional'nyj issledovatel'skij universitet informacionnyh tehnologij mehaniki i optiki
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Clément Rougeux
Université Laval
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Chrystelle Delord
MARBEC
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Philippe Borsa
IRD
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Cathy Liautard-Haag
MARBEC
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Mohamed Hassan
MARBEC
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Amandine Marie
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Pierre Feutry
CSIRO
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Peter Grewe
CSIRO Ecosystems and Biodiversity
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Campbell Davies
CSIRO
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Jessica Farley
CSIRO
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Daniel Fernando
Blue Resources Trust
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Sebastian Biton-Porsmoguer
OFB
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François Poisson
MARBEC
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Denham Parker
Republic of South Africa Department of Environment Forestry and Fisheries
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Agostino Leone
MARBEC
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Jorden Aulich
CSIRO
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Matt Lansdell
CSIRO
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Francis Marsac
MARBEC
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Sophie Arnaud-Haond
MARBEC
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Abstract

The blue shark Prionace glauca is a top predator with one of the widest geographic distributions of any shark species, yet classified as critically endangered in the Mediterranean Sea, and Near Threatened globally. Previous genetic studies did not reject the null hypothesis of a single global population across the worldwide species range. Blue shark situation was proposed as a possible archetype of the ‘grey zone of population differentiation’, coined to designate cases where population structure may be too recent or too faint to be detected using a limited set of markers. Here, blue shark samples collected throughout its global range were sequenced using a specific ddRAD method (DArTseq; Georges et al. 2018), which recovered 37,655 genome-wide single nucleotide polymorphisms (SNPs). Two main groups emerged, with Mediterranean Sea and Northern Atlantic samples significantly differentiated from the Indo-west Pacific samples. Significant pairwise FST values indicated further genetic differentiation within the Atlantic Ocean, and between the Atlantic Ocean and the Mediterranean Sea. Reconstruction of recent demographic history suggested the divergence between northern and southern oceanic populations emerged about 500 generations ago and revealed a drastic reduction in effective population size from a large ancestral population. Our results illustrate the power of high-density genome scans to detect population structure and reconstruct demographic history in highly migratory marine species. As the management of the blue shark fishery, either as target or as bycatch, does not account for this delineation, we strongly recommend that the results presented here be considered in future stock assessment and management plans.
28 Jun 2022Submitted to Molecular Ecology
29 Jun 2022Submission Checks Completed
29 Jun 2022Assigned to Editor
06 Jul 2022Reviewer(s) Assigned
05 Nov 2022Review(s) Completed, Editorial Evaluation Pending
08 Nov 2022Editorial Decision: Revise Minor
29 Nov 2022Review(s) Completed, Editorial Evaluation Pending
29 Nov 20221st Revision Received
01 Dec 2022Editorial Decision: Accept