Conservation Genetics

, Volume 13, Issue 1, pp 99–115

Pleistocene isolation, secondary introgression and restricted contemporary gene flow in the pig-eye shark, Carcharhinus amboinensis across northern Australia

  • B. J. Tillett
  • M. G. Meekan
  • D. Broderick
  • I. C. Field
  • G. Cliff
  • J. R. Ovenden
Research Article

Abstract

We examine the structure and phylogeography of the pig-eye shark (Carcharhinus amboinensis) common in shallow coastal environments in northern Australia using two types of genetic markers, two mitochondrial (control region and NADH hydrogenase 4) and two nuclear (microsatellite and Rag 1) DNA. Two populations were defined within northern Australia on the basis of mitochondrial DNA evidence, but this result was not supported by nuclear microsatellite or Rag 1 markers. One possibility for this structure might be sex-specific behaviours such as female philopatry, although we argue it is doubtful that sufficient time has elapsed for any potential signatures from this behaviour to be expressed in nuclear markers. It is more likely that the observed pattern represents ancient populations repeatedly isolated and connected during episodic sea level changes during the Pleistocene epoch, until current day with restricted contemporary gene flow maintaining population genetic structure. Our results show the need for an understanding of both the history and ecology of a species in order to interpret patterns in genetic structure.

Keywords

Pleistocene Secondary introgression Predator Carcharhinus spp. Genetic structure North Australia 

Supplementary material

10592_2011_268_MOESM1_ESM.pdf (67 kb)
Supplementary material 2 (PDF 67 kb)
10592_2011_268_MOESM2_ESM.pdf (129 kb)
Supplementary material 3 (PDF 128 kb)

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Copyright information

© Springer Science+Business Media B.V. 2011

Authors and Affiliations

  • B. J. Tillett
    • 1
    • 2
    • 3
    • 4
  • M. G. Meekan
    • 2
    • 6
  • D. Broderick
    • 4
  • I. C. Field
    • 1
    • 2
    • 7
  • G. Cliff
    • 5
  • J. R. Ovenden
    • 4
  1. 1.Research Institute for the Environment and LivelihoodsCharles Darwin UniversityCasuarina, DarwinAustralia
  2. 2.Australian Institute of Marine ScienceArafura Timor Research FacilityDarwinAustralia
  3. 3.Tropical Rivers and Coastal Knowledge Research HubCharles Darwin UniversityYularaAustralia
  4. 4.Molecular Fisheries Laboratory, Queensland Department of EmploymentEconomic Development and InnovationSt LuciaAustralia
  5. 5.KwaZulu-Natal Sharks BoardUmhlangaSouth Africa
  6. 6.Australian Institute of Marine ScienceUWA Ocean Sciences Centre (MO96)CrawleyAustralia
  7. 7.Marine Mammal Research Group, Graduate School of The EnvironmentMacquarie UniversitySydneyAustralia

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