Genome scans discriminate independent populations of the blue shark Prionace glauca

Type Proceedings paper
Date 2020
Language English
Other localization
Author(s) Nikolic Natacha1, 2, 3, Devloo-Delva Floriaan4, 5, Bailleul Diane6, Noskova Ekaterina7, Rougeux Clément8, Liautard-Haag Cathy9, Hassan Mohamad9, 10, Marie Amandine3, 11, Borsa Philippe12, Feutry Pierre4, Grewe Peter4, Davies Campbell4, Farley Jessica4, Fernando Daniel13, Biton Porsmoguer Sébastien15, 16, Poisson Francois9, Parker Denham17, Aulich Jorden4, Lansdell Matt4, Marsac Francis1, Arnaud-Haond SophieORCID9
Affiliation(s) 1 : IRD, UMR MARBEC, Sète, France
2 : INRAE, Ecobiop, St-Pée-sur-Nivelle, France
3 : ARBRE, Agence de Recherche pour la Biodiversité à la Réunion, Saint-Gilles, La Réunion
4 : CSIRO Oceans and Atmosphere, Hobart, Australia
5 : School of Natural Sciences – Quantitative Marine Science, University of Tasmania, Hobart, 7001 TAS, Australia
6 : INRAE, Castanet Tolosan, France
7 : Computer Technologies Laboratory, ITMO University. St Petersburg, Russia
8 : University of Calgary, Calgary, Canada
9 : IFREMER, UMR MARBEC, Sète, France
10 : Animal Production Department, Faculty of Agriculture, Tishreen University, Syria
11 : ESE, Ecology and Ecosystems Health, Agrocampus Ouest, INRAE, 35042 Rennes, France
12 : IRD, UMR ENTROPIE, Montpellier, France
13 : Blue Resources Trust, Colombo 00700, Sri Lank
14 : University of Girona, Institute of Aquatic Ecology
15 : Aix-Marseille University, Mediterranean Institute of Oceanography (MIO), Marseille, France
16 : OFB, Office Français de la Biodiversité, Délégation Manche Mer du Nord, Le Havre, France
17 : South African Department of Environment, Forestry and Fisheries (DEFF), Cape Town, South Africa
Meeting WPEB16 - 15th Working Party on Ecosystems and Bycatch. 07/09/2020 -10/09/2020, Online
Source WPEB16 - 15th Working Party on Ecosystems and Bycatch. 07/09/2020 -10/09/2020, Online.IOTC-2020-WPEB16-14, 18p.

The blue shark Prionace glauca is a cosmopolitan species that inhabits all oceans worldwide except the poles. Several IUCN regional assessments have classified   it as Near Threatened, mostly due to overfishing. Previous genetic studies that have used classical genetic markers failed to reject the hypothesis that the species is a single worldwide population (panmixia). As such, the blue shark was proposed to be an archetype of the ‘grey zone of population differentiation’, named to signify those cases common in the marine realm, where the split among population is too recent or too faint to be detected using classical genetic markers. Here, samples collected across the majority of the global range of blue shark were sequenced (using a specific genome scan method named DArTseq) and screened through genome scan using 37,655 single nucleotide polymorphisms. Significant differences distinguished locations from the northern (Mediterranean and North Atlantic) vs. southern (southeastern Atlantic, Indian Ocean and southwestern Pacific) oceanic regions. Furthermore, FST values were significant, albeit low, between locations from distinct regions within the Atlantic Ocean (northern vs. northeastern vs. southeastern Atlantic). In addition, FST values were significant between these Atlantic locations and Mediterranean, Indian, and Pacific locations. These results illustrate the power of genome scans to delineate independent populations in marine species and to accurately identify distinct management units.

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Nikolic Natacha, Devloo-Delva Floriaan, Bailleul Diane, Noskova Ekaterina, Rougeux Clément, Liautard-Haag Cathy, Hassan Mohamad, Marie Amandine, Borsa Philippe, Feutry Pierre, Grewe Peter, Davies Campbell, Farley Jessica, Fernando Daniel, Biton Porsmoguer Sébastien, Poisson Francois, Parker Denham, Aulich Jorden, Lansdell Matt, Marsac Francis, Arnaud-Haond Sophie (2020). Genome scans discriminate independent populations of the blue shark Prionace glauca. WPEB16 - 15th Working Party on Ecosystems and Bycatch. 07/09/2020 -10/09/2020, Online.IOTC-2020-WPEB16-14, 18p.