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Genetic population structure and demography of an apex predator, the tiger shark Galeocerdo cuvier

Pirog Agathe, Jaquemet Sébastien, Ravigné Virginie, Cliff Geremy, Clua Eric, Holmes Bonnie J., Hussey Nigel E., Nevill John E. G., Temple Andrew J., Berggren Per, Vigliola Laurent, Magalon Hélène. 2019. Genetic population structure and demography of an apex predator, the tiger shark Galeocerdo cuvier. Ecology and Evolution, 9 (10) : pp. 5551-5571.

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Quartile : Q2, Sujet : ECOLOGY / Quartile : Q3, Sujet : EVOLUTIONARY BIOLOGY

Abstract : Population genetics has been increasingly applied to study large sharks over the last decade. Whilst large shark species are often difficult to study with direct methods, improved knowledge is needed for both population management and conservation, especially for species vulnerable to anthropogenic and climatic impacts. The tiger shark, Galeocerdo cuvier, is an apex predator known to play important direct and indirect roles in tropical and subtropical marine ecosystems. While the global and Indo‐West Pacific population genetic structure of this species has recently been investigated, questions remain over population structure and demographic history within the western Indian (WIO) and within the western Pacific Oceans (WPO). To address the knowledge gap in tiger shark regional population structures, the genetic diversity of 286 individuals sampled in seven localities was investigated using 27 microsatellite loci and three mitochondrial genes (CR, COI, and cytb). A weak genetic differentiation was observed between the WIO and the WPO, suggesting high genetic connectivity. This result agrees with previous studies and highlights the importance of the pelagic behavior of this species to ensure gene flow. Using approximate Bayesian computation to couple information from both nuclear and mitochondrial markers, evidence of a recent bottleneck in the Holocene (2,000–3,000 years ago) was found, which is the most probable cause for the low genetic diversity observed. A contemporary effective population size as low as 111 [43,369] was estimated during the bottleneck. Together, these results indicate low genetic diversity that may reflect a vulnerable population sensitive to regional pressures. Conservation measures are thus needed to protect a species that is classified as Near Threatened.

Mots-clés Agrovoc : Requin, Galeocerdo cuvier, Dynamique des populations, Variation génétique

Mots-clés géographiques Agrovoc : océan Indien, Océan pacifique

Mots-clés libres : Approximate Bayesian computation, Bottleneck, Effective population size, Microsatellite DNA, Mitochondrial DNA, Tiger shark

Classification Agris : L20 - Animal ecology
L10 - Animal genetics and breeding

Champ stratégique Cirad : CTS 1 (2019-) - Biodiversité

Auteurs et affiliations

  • Pirog Agathe, Université de la Réunion (REU)
  • Jaquemet Sébastien, Université de la Réunion (REU)
  • Ravigné Virginie, CIRAD-BIOS-UMR PVBMT (REU) ORCID: 0000-0002-4252-2574
  • Cliff Geremy, University of KwaZulu-Natal (ZAF)
  • Clua Eric, CNRS (FRA)
  • Holmes Bonnie J., University of Queensland (AUS)
  • Hussey Nigel E., University of Windsor (CAN)
  • Nevill John E. G., Environment Seychelles (SYC)
  • Temple Andrew J., Newcastle University (GBR)
  • Berggren Per, Newcastle University (GBR)
  • Vigliola Laurent, Université de la Réunion (REU)
  • Magalon Hélène, Université de la Réunion (REU) - auteur correspondant

Source : Cirad-Agritrop (https://agritrop.cirad.fr/593251/)

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