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

Lookup NU author(s): Dr Andrew Temple, Professor Per Berggren



This work is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0).


Knowledge of population structure, connectivity, and effective population size remains 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 microsatellite 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.

Publication metadata

Author(s): Pirog A, Ravigné V, Fontaine MC, Rieux A, Gilabert A, Cliff G, Clua E, Daly R, Heithaus MR, Kiszka JJ, Matic P, Nevill JEG, Smoothey AF, Temple AJ, Berggren P, Jaquemet S, Magalon H

Publication type: Article

Publication status: Published

Journal: Ecology and Evolution

Year: 2019

Volume: 9

Issue: 23

Pages: 12980-13000

Print publication date: 16/12/2019

Online publication date: 30/09/2019

Acceptance date: 28/07/2019

Date deposited: 22/10/2019

ISSN (electronic): 2045-7758

Publisher: Wiley


DOI: 10.1002/ece3.5597


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Funder referenceFunder name
MASMA/CP/2014/01Western Indian Ocean Marine Science Association (WIOMSA)