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

Devloo-Delva, Floriaan and Burridge, Christopher P. and Kyne, Peter and Brunnschweiler, Juerg M. and Chapman, Demian and Charvet, Patricia and Chen, Xiao and Cliff, Geremy and Daly, Ryan and Drymon, J. Marcus and Espinoza, Mario and Fernando, Daniel and Garcia Barcia, Laura and Glaus, Kerstin and González-Garza, Bianca and Grant, Michael I. and Gunasekera, Rasanthi M. and Hernandez, Sebastian and Hyodo, Susumu and Jabado, Rima and Jaquemet, Sébastien and Johnson, Grant and Ketchum, James T. and Magalon, Hélène and Marthick, James R. and Mollen, Frederik H. and Mona, Stefano and Naylor, Gavin J.P. and Nevill, John E. G. and Phillips, Nicole M. and Pillans, Richard D. and Postaire, Bautisse D. and Smoothey, Amy F. and Tachihara, Katsunori and Tillet, Bree and 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). NA. ISSN 2045-7758

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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 Type: Journal Article
Subjects: Q Science > Q Science (General) > Q1-390 Science (General)
Q Science > QL Zoology
Divisions: School of Agriculture, Geography, Environment, Ocean and Natural Sciences (SAGEONS)
Depositing User: Kerstin Glaus
Date Deposited: 09 Mar 2023 23:38
Last Modified: 16 Oct 2023 22:07

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