From rivers to ocean basins: The role of ocean barriers and philopatry in the genetic structuring of a cosmopolitan coastal predator - Université de La Réunion Access content directly
Journal Articles Ecology and Evolution Year : 2023

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

Peter M Kyne
Juerg M Brunnschweiler
Mario Espinoza
Daniel Fernando
Kerstin Glaus
Michael I Grant
Sebastian Hernandez
Susumu Hyodo
Rima W Jabado
James T Ketchum
Frederik H Mollen
John E G Nevill
  • Function : Author
Nicole M Phillips
Bree J Tillet
Jorge A Valerio‐vargas
Bautisse Postaire
  • Function : Author
  • PersonId : 968966

Abstract

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.
Fichier principal
Vignette du fichier
Ecology and Evolution - 2023 - Devloo‐Delva - From rivers to ocean basins The role of ocean barriers and philopatry in the.pdf (8.37 Mo) Télécharger le fichier
Origin : Publication funded by an institution
Licence : CC BY - Attribution

Dates and versions

hal-04051570 , version 1 (30-03-2023)

Licence

Attribution

Identifiers

Cite

Floriaan Devloo‐delva, Christopher P Burridge, Peter M Kyne, Juerg M Brunnschweiler, Demian D Chapman, et al.. From rivers to ocean basins: The role of ocean barriers and philopatry in the genetic structuring of a cosmopolitan coastal predator. Ecology and Evolution, 2023, 13 (2), ⟨10.1002/ece3.9837⟩. ⟨hal-04051570⟩
29 View
32 Download

Altmetric

Share

Gmail Facebook X LinkedIn More