Population structure and connectivity of tiger sharks (Galeocerdo cuvier) across the Indo-Pacific Ocean basin

Bonnie J. Holmes, Samuel M. Williams, Nicholas M. Otway, Einar Eg Nielsen, Safia L. Maher, Mike B. Bennett, Jennifer R. Ovenden

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Abstract

Population genetic structure using nine polymorphic nuclear microsatellite loci was assessed for the tiger shark (Galeocerdo cuvier) at seven locations across the Indo-Pacific, and one location in the southern Atlantic. Genetic analyses revealed considerable genetic structuring (FST > 0.14, p<0.001) between all Indo-Pacific locations and Brazil. By contrast, no significant genetic differences were observed between locations from within the Pacific or Indian Oceans, identifying an apparent large, single Indo-Pacific population. A lack of differentiation between tiger sharks sampled in Hawaii and other Indo-Pacific locations identified herein is in contrast to an earlier global tiger shark nDNA study. The results of our power analysis provide evidence to suggest that the larger sample sizes used here negated any weak population subdivision observed previously. These results further highlight the need for crossjurisdictional efforts to manage the sustainable exploitation of large migratory sharks like G. cuvier.
Original languageEnglish
Article number170309
JournalRoyal Society Open Science
Volume4
Issue number7
ISSN2054-5703
DOIs
Publication statusPublished - 2017

Keywords

  • MULTIDISCIPLINARY
  • MOVEMENT PATTERNS
  • HABITAT USE
  • AUSTRALIA
  • MARINE
  • DIFFERENTIATION
  • CONSERVATION
  • SOFTWARE
  • TRENDS
  • HAWAII
  • GENETICS
  • tiger shark
  • Galeocerdo cuvier
  • population structure
  • microsatellite loci
  • Indo-Pacific Ocean

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