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Ecology, management and conservation in natural and modified habitats
RESEARCH ARTICLE

Population trend of feral camels in the Northern Territory, Australia

Glenn P. Edwards A C , Keith Saalfeld B and Bretan Clifford A
+ Author Affiliations
- Author Affiliations

A Department of Infrastructure, Planning and Environment, PO Box 2130, Alice Springs, NT 0871, Australia.

B Department of Infrastructure, Planning and Environment, PO Box 496, Palmerston, NT 0831, Australia.

C Corresponding author. Email: glen.edwards@nt.gov.au

Wildlife Research 31(5) 509-517 https://doi.org/10.1071/WR03073
Submitted: 11 August 2003  Accepted: 20 April 2004   Published: 13 December 2004

Abstract

We conducted a broad-scale aerial survey between 20 August and 12 October 2001 to ascertain the distribution and abundance of feral camels in the southern part of the Northern Territory. There was a minimum of 80 533 feral camels in the Northern Territory at the time of the survey. This figure is corrected for perception bias (a result of observers missing animals that are potentially visible), but not for availability bias (a result of some animals being concealed from the observers). The population of feral camels in the Northern Territory increased at a mean annual exponential rate, r, of 0.093 between 1993 and 2001. This represents an increase of ~10% per year or an approximate doubling in population size every 8 years. This trend is likely to continue for the foreseeable future. We use the results of an earlier survey (which included the Northern Territory, South Australia and Western Australia) to give a minimum figure of 300 000 feral camels for Australia in 2001. We discuss what is known of the impacts of feral camels in Australia, the inadequacy of current management practices and issues to be considered in designing an effective long-term management strategy for the species.


Acknowledgments

We thank our pilots Tony Spring and Matthew Johnson for superlative flying. We thank Kurt Tschirner, Shane Wright, Bernie Shakeshaft, Jonathan Vea, Simon Watkinson, Jeff Turpin, Kym Schwartzkopff and Salima Spring, who assisted as observers. We sincerely thank Debbie and Matthew Braitling of Mt Doreen station, Ashley Severin of Curtain Springs station, Paula and John Kilgariff of Erldunda station, Peter and Robbie Bloomfield of Andado station, and Kim and Shane Braitling of Numery station for allowing us to use their properties as bases of operation and for their kind hospitality. Rossy Bryan assisted with survey design and logistics. Birgit Dörges, Jurgen Heucke, Ken Johnson, Tony Bowland, Rob Taylor, David Lawson and Tony Pople commented on drafts of this paper. Comments by an anonymous reviewer greatly improved the manuscript. Rainfall data were obtained courtesy of the Australian Bureau of Meteorology.


References

Anon. (1991). ‘Culling of Large Feral Animals in the Northern Territory. Report by the Senate Select Committee on Animal Welfare, June 1991.’ (Senate Publications Unit: Canberra.)

Bayliss, P. , and Yeomans, K. M. (1989). Distribution and abundance of feral livestock in the ‘Top End’ of the Northern Territory (1985–86), and their relation to population control. Australian Wildlife Research 16, 651–676.
Caughley G. (1977). ‘Analysis of Vertebrate Populations.’ (John Wiley and Sons: Chichester.)

Caughley G. (1979a). Sampling techniques for aerial censuses. In ‘Aerial Surveys of Fauna Populations. Proceedings of a Workshop held in University House, Australian National University, Canberra, Australia, 22–25 February 1977’. pp. 9–13. (Australian Government Publishing Service: Canberra.)

Caughley G. (1979b). Design for aerial census. In ‘Aerial Surveys of Fauna Populations. Proceedings of a Workshop held in University House, Australian National University, Canberra, Australia, 22–25 February 1977’. pp. 15–23. (Australian Government Publishing Service: Canberra.)

Caughley G. (1987). Ecological relationships. In ‘Kangaroos, Their Ecology and Management in the Sheep Rangelends of Australia’. (Eds G. Caughley, N. Shepherd and J. Short.) pp. 159–187. (Cambridge University Press: Cambridge.)

Caughley, G. C. , and Grigg, G. C. (1982). Numbers and distribution of kangaroos in the Queensland pastoral zone. Australian Wildlife Research 9, 365–371.
Caughley G., and Sinclair A. R. E. (1994). ‘Wildlife Ecology and Management.’ (Blackwell Science: Cambridge.)

Caughley, G. , Sinclair, R. , and Scott-Kemmis, D. (1976). Experiments in aerial survey. Journal of Wildlife Management 40, 290–300.
Connors G., Oliver B., and Woinarski J. (1996). Bioregions in the Northern Territory: conservation values, reservation status and information gaps. Parks and Wildlife Commission of the Northern Territory final report to Australian Nature Conservation Agency, National Reserves System Cooperative Program Project N607, Canberra.

Dörges B., and Heucke J. (1995). Ecology, social organization and behavior of the feral dromedary Camelus dromedarius (L. 1758) in central Australia. Unpublished translation of two dissertations, University of Braunschweig, Braunschweig. [Available from the Arid Zone Research Institute Library, Alice Springs.]

Dörges B., and Heucke J. (2003). Demonstration of ecologically sustainable management of camels on aboriginal and pastoral land. Final report on project No. 200046 of the National Heritage Trust, Canberra, Australia. [Available from the Arid Zone Research Institute Library, Alice Springs.]

Edwards, G. P. , Eldridge, S. R. , Wurst, D. , Berman, D. M. , and Garbin, V. (2001). Movement patterns of female feral camels in central and northern Australia. Wildlife Research 28, 283–289.
Crossref | GoogleScholarGoogle Scholar | Graham A., Johnson K., and Graham P. (1986). An aerial survey of horses and other large animals in the Alice Springs and Gulf regions. Technical Report No. 28. Conservation Commission of the Northern Territory, Alice Springs. [Available from the Arid Zone Research Institute Library, Alice Springs.]

Grigg, G. C. , Pople, A. R. , and Beard, L. A. (1995). Movements of feral camels in central Australia determined by satellite telemetry. Journal of Arid Environments 31, 459–469.
Köhler-Rollefson I., Mundy P., and Mathias E. (2001). ‘A Field Manual of Camel Diseases. Traditional and Modern Health Care for the Dromedary.’ (ITDG Publishing: London.)

Marsh, H. , and Sinclair, D. F. (1989). Correcting for visibility bias in strip transect aerial surveys of aquatic fauna. Journal of Wildlife Management 53, 1017–1024.
McKnight T. L. (1969). ‘The Camel in Australia.’ (Melbourne University Press: Melbourne.)

McLeod, S. R. (1997). Is the concept of carrying capacity useful in variable environments? Oikos 79, 529–542.
Parkes J., Henzell R., and Pickles G. (1996). ‘Managing Vertebrate Pests: Feral Goats.’ (Australian Government Publishing Service: Canberra.)

Pople, A. R. , Grigg, G. C. , Cairns, S. C. , Alexander, P. , Beard, L. A. , and Henzell, R. P. (1996). Trends in numbers and changes in the distribution of feral goats (Capra hircus) in the South Australian pastoral zone. Wildlife Research 23, 687–696.
Rose B. (1995). Land management issues: attitudes and perceptions amongst Aboriginal people of central Australia. A report to the Central Land Council, Alice Springs, NT, Australia, and the National Landcare Program, Canberra, ACT, Australia.

Short, J. , Caughley, G. , Grice, D. , and Brown, B. (1988). The distribution and relative abundance of camels in Australia. Journal of Arid Environments 15, 91–97.
Thackway R., and Cresswell I. D. (1995). ‘An Interim Biogeographic Regionalisation for Australia: a Framework for Establishing the National System of Reserves.’ 4th edn. (Australian Nature Conservation Agency: Canberra.)

Wurst D., and Saalfeld W. K. (1994). Aerial survey of feral camels and other large vertebrate species in the Alice Springs region of the Northern Territory. Parks and Wildlife Commission of the Northern Territory final report to Australian Nature Conservation Agency, Canberra, ACT, Australia. [Available from the Arid Zone Research Institute Library, Alice Springs.]