Stepping up to genome scan allows stock differentiation in the worldwide distributed blue shark Prionace glauca
Type | Article | ||||||||||||||||
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Date | 2023-03 | ||||||||||||||||
Language | English | ||||||||||||||||
Author(s) | Nikolic Natacha2, 3, 14, Devloo‐delva Floriaan4, 5, Bailleul Diane1, Noskova Ekaterina6, Rougeux Clément7, Delord Chrystelle14, Borsa Philippe8, Liautard‐haag Cathy14, Hassan Mohamad1, 9, Marie Amandine D.3, Feutry Pierre4, Grewe Peter4, Davies Campbell4, Farley Jessica4, Fernando Daniel10, Biton‐porsmoguer Sebastian11, Poisson Francois1, Parker Denham12, 13, Leone Agostino1, Aulich Jorden4, Lansdell Matt4, Marsac Francis14, Arnaud-Haond Sophie1 | ||||||||||||||||
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 14 : UMR MARBEC University of Montpellier, IRD, Ifremer, CNRS Sète, France |
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Source | Molecular Ecology (0962-1083) (Wiley), 2023-03 , Vol. 32 , N. 5 , P. 1000-1019 | ||||||||||||||||
DOI | 10.1111/mec.16822 | ||||||||||||||||
WOS© Times Cited | 7 | ||||||||||||||||
Keyword(s) | blue shark, bycatch, genome scans, pelagic, population genetics, SNPs, stock differentiation and assessment | ||||||||||||||||
Abstract | 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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