From rivers to ocean basins: The role of ocean barriers and philopatry in the genetic structuring of a cosmopolitan coastal predator

Devloo-Delva, Floriaan, Burridge, Christopher P., Kyne, Peter M., Brunnschweiler, Juerg M., Chapman, Demian D., Charvet, Patricia, Chen, Xiao, Cliff, Geremy, Daly, Ryan, Drymon, J. Marcus, Espinoza, Mario, Fernando, Daniel, Barcia, Laura Garcia, Glaus, Kerstin, González-Garza, Blanca I., Grant, Michael I., Gunasekera, Rasanthi M., Hernandez, Sebastian, Hyodo, Susumu, Jabado, Rima W., Jaquemet, Sébastien, Johnson, Grant, Ketchum, James T., Magalon, Hélène, Marthick, James R., Mollen, Frederik H., Mona, Stefano, Naylor, Gavin J.P., Nevill, John E.G., Phillips, Nicole M., Pillans, Richard D., Postaire, Bautisse D., Smoothey, Amy F., Tachihara, Katsunori, Tillet, Bree J., Valerio-Vargas, Jorge A., and Feutry, Pierre (2023) From rivers to ocean basins: The role of ocean barriers and philopatry in the genetic structuring of a cosmopolitan coastal predator. Ecology and Evolution, 13 (2). e9837.

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The Bull Shark (Carcharhinus leucas) faces varying levels of exploitation around the world due to its coastal distribution. Information regarding population connectivity is crucial to evaluate its conservation status and local fishing impacts. In this study, we sampled 922 putative Bull Sharks from 19 locations in the first global assessment of population structure of this cosmopolitan species. Using a recently developed DNA-capture approach (DArTcap), samples were genotyped for 3400 nuclear markers. Additionally, full mitochondrial genomes of 384 Indo-Pacific samples were sequenced. Reproductive isolation was found between and across ocean basins (eastern Pacific, western Atlantic, eastern Atlantic, Indo-West Pacific) with distinct island populations in Japan and Fiji. Bull Sharks appear to maintain gene flow using shallow coastal waters as dispersal corridors, whereas large oceanic distances and historical land-bridges act as barriers. Females tend to return to the same area for reproduction, making them more susceptible to local threats and an important focus for management actions. Given these behaviors, the exploitation of Bull Sharks from insular populations, such as Japan and Fiji, may instigate local decline that cannot readily be replenished by immigration, which can in turn affect ecosystem dynamics and functions. These data also supported the development of a genetic panel to ascertain the population of origin, which will be useful in monitoring the trade of fisheries products and assessing population-level impacts of this harvest.

Item ID: 78410
Item Type: Article (Research - C1)
ISSN: 2045-7758
Keywords: close-kin, DArTseq, DNA forensics, genetic connectivity, mitogenome, provenance
Copyright Information: © 2023 The Authors. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
Research Data:
Date Deposited: 17 Oct 2023 02:28
FoR Codes: 31 BIOLOGICAL SCIENCES > 3103 Ecology > 310305 Marine and estuarine ecology (incl. marine ichthyology) @ 50%
41 ENVIRONMENTAL SCIENCES > 4104 Environmental management > 410401 Conservation and biodiversity @ 50%
SEO Codes: 18 ENVIRONMENTAL MANAGEMENT > 1802 Coastal and estuarine systems and management > 180203 Coastal or estuarine biodiversity @ 100%
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