Stepping up to genome scan allows stock differentiation in the worldwide distributed blue shark Prionace glauca

Type Article
Date 2023-03
Language English
Author(s) Nikolic NatachaORCID1, 2, 3, Devloo‐delva FloriaanORCID4, 5, Bailleul Diane1, Noskova Ekaterina6, Rougeux Clément7, Delord ChrystelleORCID1, Borsa Philippe8, Liautard‐haag Cathy1, Hassan MohamadORCID1, 9, Marie Amandine D.ORCID3, Feutry PierreORCID4, Grewe Peter4, Davies Campbell4, Farley Jessica4, Fernando Daniel10, Biton‐porsmoguer Sebastian11, Poisson Francois1, Parker Denham12, 13, Leone AgostinoORCID1, Aulich Jorden4, Lansdell Matt4, Marsac Francis1, Arnaud-Haond SophieORCID1
Affiliation(s) 1 : UMR MARBEC University of Montpellier, IRD, Ifremer, CNRS Sète, France
2 : INRAE Ecobiop, AQUA Saint‐Pée‐sur‐Nivelle, France
3 : ARBRE Agence de Recherche pour la Biodiversité à la Réunion Saint‐Gilles,France
4 : CSIRO Environment Hobart Tasmania, Australia
5 : School of Natural Sciences—Quantitative Marine Science University of Tasmania Hobart Tasmania ,Australia
6 : Computer Technologies Laboratory ITMO University St Petersburg, Russia
7 : University of Calgary Calgary ,Canada
8 : Institut de recherche pour le développement UMR ENTROPIE Montpellier, France
9 : Animal Production Department Tishreen University Latakia, Syria
10 : Blue Resources Trust Colombo, Sri Lanka
11 : French Biodiversity Agency (OFB) Channel and North Sea Delegation Le Havre ,France
12 : Department of Forestry Fisheries and the Environment, (DFFE) Cape Town ,South Africa
13 : Department of Biological Sciences University of Cape Town Rondebosch ,South Africa
Source Molecular Ecology (0962-1083) (Wiley), 2023-03 , Vol. 32 , N. 5 , P. 1000-1019
DOI 10.1111/mec.16822
Keyword(s) blue shark, bycatch, genome scans, pelagic, population genetics, SNPs, stock differentiation and assessment

The blue shark Prionace glauca is a top predator with one of the widest geographical distributions of any shark species. It is 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. The blue shark 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 RAD method (DArTseq), which recovered 37,655 genome-wide single nucleotide polymorphisms (SNPs). Two main groups emerged, with Mediterranean Sea and northern Atlantic samples (Northern population) differentiated significantly from the Indo-west Pacific samples (Southern population). 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 divergence between Northern and Southern populations occurred about 500 generations ago and revealed a drastic reduction in effective population size from a large ancestral population. Our results illustrate the power of genome scans to detect population structure and reconstruct demographic history in highly migratory marine species. Given that the management plans of the blue shark (targeted or bycatch) fisheries currently assume panmictic regional stocks, we strongly recommend that the results presented here be considered in future stock assessments and conservation strategies.

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Nikolic Natacha, Devloo‐delva Floriaan, Bailleul Diane, Noskova Ekaterina, Rougeux Clément, Delord Chrystelle, Borsa Philippe, Liautard‐haag Cathy, Hassan Mohamad, Marie Amandine D., Feutry Pierre, Grewe Peter, Davies Campbell, Farley Jessica, Fernando Daniel, Biton‐porsmoguer Sebastian, Poisson Francois, Parker Denham, Leone Agostino, Aulich Jorden, Lansdell Matt, Marsac Francis, Arnaud-Haond Sophie (2023). Stepping up to genome scan allows stock differentiation in the worldwide distributed blue shark Prionace glauca. Molecular Ecology, 32(5), 1000-1019. Publisher's official version : , Open Access version :