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Conservation Genetics

, Volume 14, Issue 5, pp 1043–1055 | Cite as

Reduced total genetic diversity following translocations? A metapopulation approach

  • A. H. Thrimawithana
  • L. Ortiz-Catedral
  • A. Rodrigo
  • M. E. Hauber
Research Article

Abstract

Translocation is the movement of a group of individuals from one site to another. Conservationists and wildlife managers around the world use translocation to new and/or newly safe habitats as a tool for preserving and propagating threatened species whose populations are surviving at only few and vulnerable localities. The success of translocations is typically defined as the establishment of a self-sustaining population. However, this definition overlooks the genetic consequences of translocations at the metapopulation scale, especially when maintaining genetic diversity is one of the specific aims of immediate and/or long-term management goals for the translocated population. We evaluated the potential effects of translocation on the total genetic diversity of a metapopulation in an increasingly common scenario: a small island as the source site, and a nearby predator-proofed, large island as the target site. Specifically, we tested the counterintuitive hypothesis that translocation and subsequent migration between an expanding, recently established population and the original population might actually result in the suppression of genetic diversity in the metapopulation relative to the temporal course of genetic drift in the small island population without translocation (control). Our simulations confirm that the directional genetic consequences of translocations are complex and depend on the combination of parameter estimates used for the modelling. Critically, however, under a lower rate of migration, lower rate of growth and higher carrying capacity on the translocation site, and smaller initial size of the translocated population, the total genetic diversity of the metapopulation may become suppressed following a translocation, relative to the control. At the same time, when translocations are carried out under a broader set of conditions, the metapopulation genetic diversity will typically exceed that of the control. Our approach is also informative about the genetic consequences of natural re-/colonisation events between small source and nearby large target sites and the resulting metapopulation. Overall, these results confirm the importance of translocation as a potentially effective and successful conservation genetic tool.

Keywords

Conservation management Genetic diversity Simulation Translocation 

Notes

Acknowledgments

For discussions we are grateful to the crew and researchers of the Tangaroa 2007 research expedition by NIWA, New Zealand, and others at the University of Auckland and Massey University and Charles Darwin Foundation. For funding, we are grateful to the School of Biological Sciences, University of Auckland, the USA National Science Foundation, the National Geographic Society, the HFSP, and PCS CUNY.

References

  1. Armstrong DP, McLean IG (1995) New Zealand translocations: theory and practice. Pac Conserv Biol 2:39–54Google Scholar
  2. BirdLife International (2008) Critically endangered birds: a global audit. BirdLife International, CambridgeGoogle Scholar
  3. Blackburn TM, Lockwood JL, Cassey P (2009) Avian invasions: the ecology and evolution of exotic birds. Oxford University Press, New YorkCrossRefGoogle Scholar
  4. Bodkin JL, Ballachey BE, Cronin MA, Scribner KT (1999) Population demographics and genetic diversity in remnant and translocated populations of sea otters. Conserv Biol 13:1378–1385CrossRefGoogle Scholar
  5. Brekke P, Bennett P, Santure A, Ewen JG (2011) High genetic diversity in the remnant island population of hihi and the genetic consequences of re-introduction. Mol Ecol 20:29–45PubMedCrossRefGoogle Scholar
  6. Butler D, Merton D (1992) The Black Robin: saving the world’s most endangered bird. Oxford University Press, New YorkGoogle Scholar
  7. Conant S (1988) Saving endangered species by translocation: are we tinkering with evolution? BioScience 38:254–257CrossRefGoogle Scholar
  8. Ewens WJ, Brockwell PJ, Gani JM, Resnick SI (1987). Minimum viable population size in the presence of catastrophes. In: Soule ME (ed) Viable populations for conservation, p 59–68Google Scholar
  9. Foose TJ (1983) The relevance of captive populations to the conservation of biotic diversity. In: Schonewald-Cox CM, Chambers SM, MacBryde B, Thomas LW (eds) Genetics and conservation: a reference for managing wild animal and plant populations. The Benjamin/Cummings Publishing Company Inc., San Francisco, pp 374–402Google Scholar
  10. Girardet S (2000) Tools for protecting endangered species: eradication; translocation; triangulation. PhD thesis, School of Environmental and Marine Sciences, University of AucklandGoogle Scholar
  11. Griffith B, Scott M, Carpenter JW, Reed C (1989) Translocation as a species conservation tool: status and strategy. Science 245:477–480PubMedCrossRefGoogle Scholar
  12. Hastings A, Harrison S (1994) Metapopulation dynamics and genetics. Annu Rev Ecol Syst 25:167–188CrossRefGoogle Scholar
  13. Ismar SMH, Baird K, Favell E, Hauber ME (2010) Patterns of offspring sex-ratio in a re-establishing black-winged petrel population. Emu 110:104–108CrossRefGoogle Scholar
  14. IUCN (1987) The IUCN position statement on translocation of living organisms: introduction, re-introduction and re-stocking. IUCN, GlandGoogle Scholar
  15. IUCN, UNEP, WWF (1980) The world conservation strategy. Living resource conservation for sustainable development. IUCN, GlandCrossRefGoogle Scholar
  16. Lacy RC (1987) Loss of genetic diversity from managed populations: interacting effects of drift, mutation, immigration, selection, and population subdivision. Conserv Biol 1:143–158CrossRefGoogle Scholar
  17. Magurran AE (1988) Ecological diversity and its measurement Princeton. Princeton University Press, New JerseyCrossRefGoogle Scholar
  18. Mock KE, Latch EK, Rhodes OE Jr (2004) Assessing losses of genetic diversity due to translocation: long-term case histories in Merriam’s turkey (Meleagris gallopavo merriami). Conserv Genet 5:631–635CrossRefGoogle Scholar
  19. Neate H, Dowding JE, Parker K, Hauber ME (2011) Breeding success of northern New Zealand dotterels (Charadrius obscurus aquilonius) following mammal eradication on Motuihe Island, New Zealand. Notornis 58:17–21Google Scholar
  20. Ortiz-Catedral L, Ismar SMH, Baird K, Brunton DH, Hauber ME (2009) Recolonization of Raoul Island by Kermadec red-crowned parakeets Cyanoramphus novaezelandiae cyanurus after eradication of invasive predators, Kermadec Islands archipelago, New Zealand. Conserv Evid 6:26–30Google Scholar
  21. Pannell JR, Charlesworth B (1999) Neutral genetic diversity in a metapopulation with recurrent local extinction and recolonization. Evolution 53:664–676CrossRefGoogle Scholar
  22. Parker KA (2008) Translocations: providing outcomes for wildlife, resource managers, scientists, and the human community. Restor Ecol 16:204–209CrossRefGoogle Scholar
  23. Parker KA, Laurence J (2008) Translocation of North Island saddleback Philesturnus rufusater from Tiritiri Matangi Island to Motuihe Island, New Zealand. Conserv Evid 5:47–50Google Scholar
  24. Parker KA, Hughes B, Thorogood R, Griffiths R (2004) Homing over 56 km by a North Island tomtit (Petroica macrocephala toitoti). Notornis 51:238–239Google Scholar
  25. R Development Core Team (2009) R: a language and environment for statistical computing. In: R foundation for statistical computing, Vienna, Austria. http://www.R-project.org
  26. Scribner KT (2006) Genetic consideration in reintroduction. In: Groom MJ, Meffe GK, Carroll CR (eds) Principles of conservation biology, 3rd edn. Sinauer Associates Inc., Sunderland, pp 567–568Google Scholar
  27. Scribner KT, Meffe GK, Groom MJ (2006) Conservation genetics: The use and importance of genetic information. In: Groom MJ, Meffe GK, Carroll CR (eds) Principles of conservation genetics. Sinauer Associates Inc., SunderlandGoogle Scholar
  28. Simpson EH (1949) Measurment of diversity. Nature 163:688CrossRefGoogle Scholar
  29. Sugihara G (1980) Minimal community structure: an explanation of species abundance patterns. Am Nat 116:770CrossRefGoogle Scholar
  30. Sutherland WJ, Armstrong D, Butchart SHM, Earnhardt JM, Ewen J, Jamieson I, Jones CG, Lee R, Newbery P, Nichols JD, Parker KA, Sarrazin F, Seddon PJ, Shah N, Tatayah V (2010) Standards for documenting and monitoring bird reintroduction projects. Conserv Lett 3:229–235CrossRefGoogle Scholar
  31. Towns DR, Daugherty CH, Cromarty PL (1990) Protocols for translocation of organisms to islands. In: Towns DR, Daugherty CH, Atkinson IAE (eds) Ecological restoration of New Zealand islands. Department of Conservation, Wellington, pp 240–254Google Scholar
  32. Wang J, Brekke P, Huchard E, Knapp LA, Cowlishaw G (2010) Estimation of parameters of inbreeding and genetic drift in populations with overlapping generations. Evolution 64:1704–1718PubMedCrossRefGoogle Scholar

Copyright information

© Springer Science+Business Media Dordrecht 2013

Authors and Affiliations

  • A. H. Thrimawithana
    • 1
  • L. Ortiz-Catedral
    • 2
    • 3
    • 4
  • A. Rodrigo
    • 5
  • M. E. Hauber
    • 6
  1. 1.Bioinformatics Institute, School of Biological SciencesUniversity of AucklandAucklandNew Zealand
  2. 2.Charles Darwin FoundationPuerto AyoraEcuador
  3. 3.Durrell Wildlife Conservation TrustTrinityUK
  4. 4.Institute of Natural SciencesMassey UniversityAlbanyNew Zealand
  5. 5.Department of BiologyDuke University, and the National Evolutionary Synthesis CenterDurhamUSA
  6. 6.Animal Behavior and Conservation Program, Department of Psychology, Hunter College and the Graduate CenterCity University of New YorkNew YorkUSA

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