Conservation Genetics

, Volume 12, Issue 6, pp 1619–1631

Genetic consequences of isolation: island tammar wallaby (Macropus eugenii) populations and the conservation of threatened species

  • Emily J. Miller
  • Mark D. B. Eldridge
  • Keith D. Morris
  • Kyall R. Zenger
  • Catherine A. Herbert
Research Article

DOI: 10.1007/s10592-011-0265-2

Cite this article as:
Miller, E.J., Eldridge, M.D.B., Morris, K.D. et al. Conserv Genet (2011) 12: 1619. doi:10.1007/s10592-011-0265-2

Abstract

Isolation and restricted gene flow can lead to genetic deterioration in populations. Populations of many species are increasingly becoming fragmented due to human impacts and active management is required to prevent further extinctions. Islands provide an ideal location to protect species from many mainland threatening processes such as habitat loss and fragmentation, disease and competition/predation from introduced species. However their isolation and small population size renders them prone to loss of genetic diversity and to inbreeding. This study examined two endemic and one introduced population of tammar wallaby (Macropus eugenii) on three islands in the Houtman Abrolhos Archipelago, Western Australia: East Wallabi (EWI), West Wallabi (WWI) and North Islands (NI). Nine autosomal and four Y-linked microsatellite loci, and sequence data from the mitochondrial DNA (mtDNA) control region were used to examine the impact of long-term isolation (EWI and WWI) and small founder size (NI) on genetic diversity and inbreeding. This study found all three populations had low genetic diversity, high levels of effective inbreeding and increased frequency of morphological abnormalities. Isolation has also led to significant inter-population genetic differentiation. These results highlight the importance of incorporating genetic management strategies when utilising islands as refuges for declining mainland populations.

Keywords

Conservation geneticsPopulation structureGenetic differentiationGenetic diversityInbreedingMicrosatellite

Supplementary material

10592_2011_265_MOESM1_ESM.doc (136 kb)
Supplementary material 1 (DOC 136 kb)

Copyright information

© Springer Science+Business Media B.V. 2011

Authors and Affiliations

  • Emily J. Miller
    • 1
    • 2
  • Mark D. B. Eldridge
    • 4
  • Keith D. Morris
    • 5
  • Kyall R. Zenger
    • 6
  • Catherine A. Herbert
    • 1
    • 3
  1. 1.School of Biological, Earth and Environmental SciencesUniversity of New South WalesKensingtonAustralia
  2. 2.School of Biological SciencesThe University of SydneySydneyAustralia
  3. 3.Faculty of Veterinary ScienceUniversity of SydneyCamperdownAustralia
  4. 4.Department of Molecular BiologyAustralian MuseumSydneyAustralia
  5. 5.Department of Environment and ConservationWestern Australian Wildlife Research CentreWannerooAustralia
  6. 6.School of Marine and Tropical BiologyJames Cook UniversityTownsvilleAustralia