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Biodiversity and Conservation

, 18:3235 | Cite as

Extinction of the blue antelope Hippotragus leucophaeus: modeling predicts non-viable global population size as the primary driver

  • Graham I. H. KerleyEmail author
  • Rebecca Sims-Castley
  • André F. Boshoff
  • Richard M. Cowling
Original Paper

Abstract

The extinction of the blue antelope Hippotragus leucophaeus in 1800 is poorly documented and understood, and has been ascribed to a combination of habitat loss and overhunting by early European colonists with firearms. We modeled the distribution and abundance of this species to gain insight into the extinction process. Model outputs indicate that prior to the arrival of European colonists, blue antelope were restricted to a small area (c. 4,300 km2), with an estimated population of only 370 individuals. We conclude that the historical population of blue antelope was functionally an island population in terms of demographic and genetic processes, by virtue of its limited distribution, small size and lack of metapopulation processes. The small population (effective population size ~100 individuals) would have been vulnerable to stochastic effects and was probably trapped in an extinction vortex. Hunting pressure by European colonists merely provided the coup de grace to a species already on the brink of extinction.

Keywords

Blue antelope Cape Floristic Region Extinction Hunting Metapopulation Modeling Stochastic effects 

Notes

Acknowledgments

We thank the Nelson Mandela Metropolitan University for financial support. This paper benefited from the input of two anonymous reviewers.

References

  1. Antelope Specialist Group (1996) Hippotragus leucophaeus. In: IUCN 2007. 2007 IUCN Red List of Threatened Species. http://www.iucnredlist.org
  2. Berger J (1990) Persistence of different-sized populations: an empirical assessment of rapid extinctions in bighorn sheep. Conserv Biol 4:91–98. doi: 10.1111/j.1523-1739.1990.tb00271.x CrossRefGoogle Scholar
  3. Boshoff AF, Kerley GIH (2001) Potential distributions of the medium- to large-sized mammals in the Cape Floristic Region, based on historical accounts and habitat requirements. Afr Zool 36:245–273Google Scholar
  4. Boshoff AF, Kerley GIH, Cowling RM (2001) A pragmatic approach to estimating the distributions and spatial requirements of the medium- to large-sized mammals in the Cape Floristic Region. Divers Distrib 7:29–43. doi: 10.1046/j.1472-4642.2001.00095.x CrossRefGoogle Scholar
  5. Boshoff AF, Kerley GIH, Cowling RM (2002) Estimated spatial requirements of the medium- to large-sized mammals, according to broad habitat units in the Cape Floristic Region, South Africa. Afr J Range Forage Sci 19:29–44Google Scholar
  6. Bronner GN, Hoffman M, Taylor PJ, Chimimba CT, Best PB, Mathee CA, Robinson TJ (2003) A revised systematic checklist of the extant mammals of the southern African subregion. Durb Mus Novitat 28:56–106Google Scholar
  7. Broom R (1949) The extinct blue buck of South Africa. Nature 164:1097–1098. doi: 10.1038/1641097b0 CrossRefGoogle Scholar
  8. Caughley G (1994) Directions in conservation biology. J Anim Ecol 63:215–244. doi: 10.2307/5542 CrossRefGoogle Scholar
  9. Cowling RM, Heijnis CJ (2001) The identification of Broad Habitat Units as biodiversity entities for systematic conservation planning in the Cape Floristic Region. S Afr J Bot 67:15–38Google Scholar
  10. Diamond JM (1989) Overview of recent extinctions. In: Western D, Pearl M (eds) Conservation for the twenty-first century. Oxford University Press, New York, pp 37–41Google Scholar
  11. Frankham R (1998) Inbreeding and extinction in island populations. Conserv Biol 12:665–675. doi: 10.1046/j.1523-1739.1998.96456.x CrossRefGoogle Scholar
  12. Franklin IR (1980) Evolutionary change in small populations. In: Soule ME, Wilcox BA (eds) Conservation Biology, an evolutionary-ecological perspective. Sinauer Associates, Sunderland, pp 135–149Google Scholar
  13. Hanski I (1991) Single-species metapopulation dynamics: concepts, models and observations. Biol J Linn Soc Lond 42:17–38. doi: 10.1111/j.1095-8312.1991.tb00549.x CrossRefGoogle Scholar
  14. Hayward MW, Kerley GIH (2008) Prey preferences and dietary overlap amongst Africa’s large predators. S Afr J Wildl Res 38:93–108. doi: 10.3957/0379-4369-38.2.93 CrossRefGoogle Scholar
  15. Kerley GIH, Pressey RL, Cowling RM, Boshoff AF, Sims-Castley R (2003) Options for the conservation of large and medium-sized mammals in the Cape Floristic Region hotspot, South Africa. Biol Conserv 112:169–190. doi: 10.1016/S0006-3207(02)00426-3 CrossRefGoogle Scholar
  16. Klein RG (1974) The taxonomic status, distribution and ecology of the blue antelope, Hippotragus leucophaeus (Pallas 1766). Ann S Afr Mus 65:99–143Google Scholar
  17. Klein RG (1983) Paleo-environmental implications of Quaternary large mammals in the Fynbos region. In: Deacon HJ, Hendey QB, Lambrechts JJN (eds) Fynbos paleoecology: a preliminary synthesis. South African National Scientific Programmes Rep. 75. CSIR, Pretoria, pp 116–138Google Scholar
  18. Lacy RC (1997) Importance of genetic variation to the viability of mammalian populations. J Mammal 78:320–335. doi: 10.2307/1382885 CrossRefGoogle Scholar
  19. Mohr E (1967) Der blaubock, Hippotragus leucophaeus (Pallas, 1967). Eine documentation. Mammalia Depicta, Paul Parey, Hamburg1-81Google Scholar
  20. Nichols AO, Viljoen PC, Knight MH, van Jaarsveld AS (1996) Evaluating population persistence of censused and unmanaged herbivore populations from the Kruger National Park, South Africa. Biol Conserv 76:657–667. doi: 10.1016/0006-3207(95)00094-1 CrossRefGoogle Scholar
  21. Ogutu J, Owen-Smith N (2003) ENSO, rainfall and temperature influence on extreme population declines among African savanna ungulates. Ecol Lett 6:412–419. doi: 10.1046/j.1461-0248.2003.00447.x CrossRefGoogle Scholar
  22. Plug I, Badenhorst S (2001) The distribition of macromammals in southern Africa over the past 30,000 years. Transv Mus Monogr 12:1–234Google Scholar
  23. Radlof FGT (2008) The ecology of large herbivores native to the coastal lowlands of the Fynbos Biome in the Western Cape, South Africa. PhD thesis, University of Stellenbosch, StellenboschGoogle Scholar
  24. Roberts A (1951) The mammals of South Africa. Central News Agency, Cape TownGoogle Scholar
  25. Robinson TJ, Bastos AD, Halanych KM, Herzog B (1996) Mitochondrial DNA sequence relationships of the extinct blue antelope Hippotragus leucophaeus. Naturwissenschaften 83:178–182PubMedGoogle Scholar
  26. Rookmaaker LC (1989) The zoological exploration of southern Africa 1650–1790. A. A. Balkema, RotterdamGoogle Scholar
  27. Skead CJ (1980) Historical mammal incidence in the Cape Province: Vol 1. The Western and Northern Cape. Department of Nature & Environmental Conservation, Cape TownGoogle Scholar
  28. Skinner JD, Chimimba CT (eds) (2005) The mammals of the southern African Subregion, 3rd edn. Cambridge University Press, Cape TownGoogle Scholar
  29. Skinner JD, Smithers RHN (1990) The mammals of the southern African Subregion, 2nd edn. University of Pretoria, PretoriaGoogle Scholar

Copyright information

© Springer Science+Business Media B.V. 2009

Authors and Affiliations

  • Graham I. H. Kerley
    • 1
    Email author
  • Rebecca Sims-Castley
    • 1
  • André F. Boshoff
    • 1
  • Richard M. Cowling
    • 2
  1. 1.Centre for African Conservation Ecology, Department of ZoologyNelson Mandela Metropolitan UniversityPort ElizabethSouth Africa
  2. 2.Department of BotanyNelson Mandela Metropolitan UniversityPort ElizabethSouth Africa

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