Population structure, connectivity, and demographic history of an apex marine predator, the bull shark Carcharhinus leucas

Pirog Agathe, Ravigné Virginie, Fontaine Michaël C., Rieux Adrien, Gilabert Aude, Cliff Geremy, Clua Eric, Daly Ryan, Heithaus Michael R., Kiszka Jeremy J., Matich Philip, Nevill John E. G., Smoothey Amy F., Temple Andrew J., Berggren Per, Jaquemet Sébastien, Magalon Hélène. 2019. Population structure, connectivity, and demographic history of an apex marine predator, the bull shark Carcharhinus leucas. Ecology and Evolution, 9 (23) : 12980-13000.

https://doi.org/10.1002/ece3.5597

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Url - jeu de données - Entrepôt autre : https://doi.org/10.5061/dryad.kp32qr6

Quartile : Q2, Sujet : ECOLOGY / Quartile : Q3, Sujet : EVOLUTIONARY BIOLOGY

Résumé : Knowledge of population structure, connectivity, and effective population size re-mains limited for many marine apex predators, including the bull shark Carcharhinus leucas. This large‐bodied coastal shark is distributed worldwide in warm temperate and tropical waters, and uses estuaries and rivers as nurseries. As an apex predator, the bull shark likely plays a vital ecological role within marine food webs, but is at risk due to inshore habitat degradation and various fishing pressures. We investigated the bull shark's global population structure and demographic history by analyzing the genetic diversity of 370 individuals from 11 different locations using 25 micros-atellite loci and three mitochondrial genes (CR, nd4, and cytb). Both types of markers revealed clustering between sharks from the Western Atlantic and those from the Western Pacific and the Western Indian Ocean, with no contemporary gene flow. Microsatellite data suggested low differentiation between the Western Indian Ocean and the Western Pacific, but substantial differentiation was found using mitochondrial DNA. Integrating information from both types of markers and using Bayesian computation with a random forest procedure (ABC‐RF), this discordance was found to be due to a complete lack of contemporary gene flow. High genetic connectivity was found both within the Western Indian Ocean and within the Western Pacific. In conclusion, these results suggest important structuring of bull shark populations globally with important gene flow occurring along coastlines, highlighting the need for management and conservation plans on regional scales rather than oceanic basin scale.

Mots-clés Agrovoc : dynamique des populations, structure de la population, Carcharhinus leucas, variation génétique, microsatellite, marqueur génétique, écologie animale

Mots-clés géographiques Agrovoc : Atlantique occidental, Pacifique occidental, océan Indien occidental

Classification Agris : M40 - Écologie aquatique
L60 - Taxonomie et géographie animales
L20 - Écologie animale

Champ stratégique Cirad : CTS 1 (2019-) - Biodiversité

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