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RESEARCH ARTICLE
Contents Vol 32(2)

The decline of a large yellow-footed rock-wallaby (Petrogale xanthopus) colony following a pulse of resource abundance

Andy Sharp A B D and Hamish McCallum A C
+ Author Affiliations
- Author Affiliations

A School of Integrative Biology and Centre for Conservation Biology, University of Queensland, St Lucia, Qld 4772, Australia.

B Current address: School of Biological Sciences, Flinders University, GPO Box 2100, Adelaide, SA 5001, Australia.

C Current address: School of Environment, Griffith University, 170 Kessels Road, Nathan, Qld 4111, Australia.

D Corresponding author. Email: andy.sharp@flinders.edu.au

Australian Mammalogy 32(2) 99-107 https://doi.org/10.1071/AM08113
Submitted: 1 September 2008  Accepted: 7 January 2010   Published: 5 August 2010

Abstract

The dynamics of a yellow-footed rock-wallaby (Petrogale xanthopus) colony in central-western Queensland were monitored between spring 1991 and winter 1994. The two years immediately before the study witnessed well above average rainfall, while average rainfall was recorded during the period of the study. Both trapping and standardised visual survey data were modelled using the Jolly–Seber–Cormack (JSC) mark–recapture estimator and the Minta–Mangel (MM) mark–resight estimator. The JSC population estimates were considerably lower than those derived from the MM estimator, indicating that the trapping program sampled only a portion of the total population. Nevertheless, a strong degree of correlation existed between both estimators, suggesting that the dynamics of the trappable subpopulation mirrored those of the total population. The colony declined markedly in size throughout the study (103 to 48 individuals, winter 1992 to winter 1994, JSC estimates; 175 to 116 individuals, summer 1993 to winter 1994, MM estimates). No significant correlations (P > 0.05) were found between seasonal and/or biannual exponential rates of population increase (r) and environmental variables. Nevertheless, a strong positive correlation was observed between biannual r and short-term rainfall (r = 0.90) and pasture conditions (r = 0.85–0.93), suggesting that the colony was influenced to some extent by fluctuations in available resources. Annual r was calculated at –0.29 (1992–93) and –0.49 (1993–94). The marked reduction in colony size suggested that it was declining towards its average carrying capacity, following a strong pulse of recruitment linked to the above-average rainfalls of 1990.

Additional keywords: exponential rate of population increase, Jolly–Seber–Cormack population estimator, mark–recapture, mark–resight, Minta–Mangel population estimator, population dynamics.


Acknowledgements

Funding for this project was generously provided by the Queensland Department of Environment (Non-commercial Macropod Fund) and Earthwatch Australia. The authors thank Tim Clancy for advice and guidance. Deepest gratitude goes to the multitudes of student and Earthwatch volunteers who assisted with trapping, particularly Janelle Lowry, Clyde McGaw, Susan Thomson, Paul Crilly and Sven Sewell. A very warm thanks goes to Col and Maureen Morgan for an abundance of friendship, support, local knowledge on Idalia and the occasional roast dinner. Pete Copley, Tony Pople and an anonymous referee provided valuable comments on initial drafts of the manuscript.


References

Banks, P. B. , Newsome, A. E. , and Dickman, C. R. (2000). Predation by red foxes limits recruitment in populations of eastern grey kangaroos. Austral Ecology 25, 283–291.
Batchelor T. A. (1980). The social organisation of the brush-tailed rock-wallaby (Petrogale penicillata penicillata) on Motutapu Island. M.Sc. Thesis, University of Auckland.

Bayliss, P. (1985a). The population dynamics of red and western grey kangaroos in arid New South Wales, Australia. II. The numerical response function. Journal of Animal Ecology 54, 127–135.
| Crossref | GoogleScholarGoogle Scholar | Bayliss P. (1987). Kangaroo dynamics. In ‘Kangaroos: Their Ecology and Management in the Sheep Rangelands of Australia’. (Eds G. Caughley, N. Shepherd and J. Short.) pp. 119–133. (Cambridge University Press: Melbourne.)

Brownie, C. , Hines, J. E. , and Nichols, J. D. (1986). Constant parameter capture–recapture models. Biometrics 42, 561–574.
| Crossref | GoogleScholarGoogle Scholar | PubMed | Cairns S. C. (1989). Models of macropodid populations. In ‘Kangaroos, Wallabies and Rat Kangaroos’. (Eds G. Grigg, P. Jarman and I. Hume.) pp. 695–704 (Surrey Beatty: Sydney.)

Cairns, S. C. , and Grigg, G. C. (1993). Population dynamics of red kangaroos (Macropus rufus) in relation to rainfall in the South Australian pastoral zone. Journal of Applied Ecology 30, 444–458.
| Crossref | GoogleScholarGoogle Scholar | Caughley G. (1977). ‘Analysis of Vertebrate Populations.’ (John Wiley and Sons: Sydney.)

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

Caughley, G. , and Gunn, A. (1993). Dynamics of large herbivores in deserts: kangaroos and caribou. Oikos 67, 47–55.
| Crossref | GoogleScholarGoogle Scholar | Caughley G. , and Sinclair A. R. E. (1994). ‘Wildlife Ecology and Management.’ (Blackwell Science: Melbourne.)

Caughley, G. , Grigg, G. C. , Caughley, J. , and Hill, G. J. E. (1980). Does dingo predation control densities of kangaroos and emus? Australian Wildlife Research 7, 1–12.
| Crossref | GoogleScholarGoogle Scholar | Delaney R. M. (1993). Life history and reproductive ecology of a tropical rock-wallaby, Petrogale assimilis. Ph.D. Thesis, James Cook University of North Queensland, Townsville.

Delaney, R. (1997). Population dynamics of the allied rock-wallaby Petrogale assimilis: implications for conservation. Australian Mammalogy 19, 199–208.
Goldizen A. W. , McCallum H. , and Pople A. R. (1998). Yellow-footed rock-wallabies (Petrogale xanthopus) at Idalia National Park: patterns of distribution, population trends and survival rates. Report to the Queensland Department of Environment, Brisbane.

Gordon, G. , McRae, P. , Lim, L. , Reimer, D. , and Porter, G. (1993). The conservation status of the yellow-footed rock-wallaby in Queensland. Oryx 27, 159–168.
| Crossref | GoogleScholarGoogle Scholar | Henzell R. (1990). Feral goats and rock-wallabies. In ‘Proceedings of the Yellow-footed Rock-wallaby Management Workshop held at Port Augusta, 20 February 1990’. (Ed. P. Copley.) (Wildlife Survey and Research Section, South Australian National Parks and Wildlife Service: Adelaide.)

Hines J. E. (1988). ‘Program Jolly: User Instructions.’ (Patuxent Wildlife Research Center: Laurel, USA.)

Jarman, P. J. , and Bayne, P. (1997). Behavioural ecology of Petrogale penicillata in relation to conservation. Australian Mammalogy 19, 219–228.
Lapidge S. J. (2001). Reintroduction biology of yellow-footed rock-wallabies Petrogale xanthopus celeris and P. x. xanthopus. Ph.D. Thesis, University of Sydney.

Lethbridge, M. R. , and Alexander, P. J. (2008). Comparing population growth rates using weighted bootstrapping: guiding the conservation management of Petrogale xanthopus xanthopus (yellow-footed rock-wallaby). Biological Conservation 141, 1185–1195.
| Crossref | GoogleScholarGoogle Scholar | Lim L. (1987). Ecology and management of the rare yellow-footed rock-wallaby Petrogale xanthopus, Gray 1854 (Macropodidae). Ph.D. Thesis, Macquarie University, Sydney.

Lim L. , Robinson A. C. , Copley P. B. , Gordon G. , Canty P. D. , and Reimer D. (1987). The conservation and management of the yellow-footed rock-wallaby Petrogale xanthopus Gray, 1854. Special publication No. 4. S.A. National Parks and Wildlife Service and S.A. Department of Planning: Adelaide.

Lim L. , Sheppard N. , Smith P. , and Smith J. (1992). The biology and management of the yellow-footed rock-wallaby (Petrogale xanthopus) in NSW. New South Wales National Parks and Wildlife Service species management report No. 10, Sydney.

Lim, T. L. , and Giles, J. R. (1987). Studies on the yellow-footed rock-wallaby, Petrogale xanthopus Gray (Marsupialia: Macropodidea). III. Distribution and management in western New South Wales. Australian Wildlife Research 14, 147–161.
| Crossref | GoogleScholarGoogle Scholar | Lowry J. (1993). Diet of the yellow-footed rock-wallaby Petrogale xanthopus celeris, Gray 1854 (Macropodidae) in central western Queensland. B.Sc.(Honours) Thesis, University of Queensland, Brisbane.

Mares, M. A. , Streilein, K. E. , and Willig, M. R. (1981). Experimental assessment of several population estimation techniques on an introduced population of eastern chipmunks. Journal of Mammalogy 62, 315–328.
| Crossref | GoogleScholarGoogle Scholar | McCallum H. (2000). ‘Population Parameters: Estimation for Ecological Models.’ (Blackwell Science: Melbourne.)

McCarthy, M. A. (1996). Red kangaroo (Macropus rufus) dynamics: effects of rainfall, density dependence, harvesting and environmental stochasticity. Journal of Applied Ecology 33, 45–53.
| Crossref | GoogleScholarGoogle Scholar | Newsome A. E. (1977). Imbalance in the sex ratio and age structure of the red kangaroo, Macropus rufus, in central Australia. In ‘The Biology of Marsupials’. (Eds B. Stonehouse and D. Gilmour.) pp. 221–233. (Macmillan: London.)

Newsome A. E. (2001). The biology and ecology of the dingo. In ‘A Symposium on the Dingo’. (Eds C. R. Dickman and D. Lunney.) pp. 20–33. (Royal Zoological Society of New South Wales: Sydney.)

Newsome A. , Pech R. , Smyth R. , Banks P. , and Dickman C. (1997). ‘Potential Impacts on Australian Native Fauna of Rabbit Calicivirus Disease.’ (Commonwealth Government Printing Service: Canberra.)

Norbury, G. L. , Coulson, G. M. , and Walters, B. L. (1988). Aspects of the demography of the western grey kangaroo, Macropus fulignosus, in a semiarid north-western Victoria. Australian Wildlife Research 15, 257–266.
| Crossref | GoogleScholarGoogle Scholar | Pople A. R. (1996). Effects of harvesting upon the demography of red kangaroos in western Queensland. Ph.D. Thesis, University of Queensland, Brisbane.

Pople, A. R. , Grigg, G. C. , Cairns, S. C. , Beard, L. A. , and Alexander, P. (2000). Trends in the numbers of red kangaroos and emus on either side of the South Australian dingo fence: evidence for predator regulation? Wildlife Research 27, 269–276.
| Crossref | GoogleScholarGoogle Scholar | Robertshaw J. D. , and Harden R. H. (1989). Predation on Macropodoidea: a review. In ‘Kangaroos, Wallabies and Rat-kangaroos’. (Eds G. Grigg, P. Jarman and I. Hume.) pp. 735–753. (Surrey Beatty: Sydney.)

Robertson G. (1987). Plant dynamics. In ‘Kangaroos: Their Ecology and Management in the Sheep Rangelands of Australia’. (Eds G. Caughley, N. Shepherd and J. Short.) pp. 50–68. (Cambridge University Press: Melbourne.)

Robinson, A. C. , Lim, L. , Canty, P. D. , Jenkins, R. B. , and Macdonald, C. A. (1994). Studies of the yellow-footed rock-wallaby (Petrogale xanthopus) Gray (Marsupialia: Macropodidae). Population studies at Middle Gorge, South Australia. Australian Wildlife Research 21, 473–481.
| Crossref | GoogleScholarGoogle Scholar | Saunders G. , Coman B. , Kinnear J. , and Braysher M. (1995). ‘Managing Vertebrate Pests: Foxes.’ (Australian Government Publishing Service: Canberra.)

Sharp, A. (1997a). The use of shelter sites by yellow-footed rock-wallabies, Petrogale xanthopus, in central-western Queensland. Australian Mammalogy 19, 239–244.
Sharp A. (2002). The ecology and conservation biology of the yellow-footed rock-wallaby. Ph.D. Thesis, University of Queensland, Brisbane.

Sharp, A. , and Norton, M. (2000). Dynamics of the New South Wales yellow-footed rock-wallaby population, in relation to rainfall patterns. Australian Mammalogy 22, 71–79.
Sinclair A. R. E. (1996). Mammal populations: fluctuation, regulation, life history and their implications for conservation. In ‘Frontiers of Population Ecology’. (Eds R. B. Floyd, A. W. Sheppard and P. J. de Barro.) pp. 127–154. (CSIRO Publishing: Melbourne.)

Southgate, R. , and Masters, P. (1996). Fluctuations of rodent populations in response to rainfall and fire in a central Australian hummock grassland dominated by Plectrachne schinzii. Wildlife Research 23, 289–303.
| Crossref | GoogleScholarGoogle Scholar | Thackway R. , and Cresswell I. (1995). ‘An Interim Biogeographic Regionalisation for Australia: a Framework for Setting Priorities in the National Reserves System Cooperative Program. Version 4.’ (Australian Nature Conservation Agency: Canberra.)

Wellard G. (1987). The effect of weather on soil moisture and plant growth in the arid zone. In ‘Kangaroos: Their Ecology and Management in the Sheep Rangelands of Australia’. (Eds G. Caughley, N. Shepherd and J. Short.) pp. 35–49. (Cambridge University Press: Melbourne.)

White G. C. (1993). Evaluation of radio tagging, marking and sighting estimators of population size using Monte Carlo simulations. In ‘Marked Individuals in the Study of Bird Populations’. (Eds J. D. Lebreton and P. M. North.) pp. 91–103. (Birkhauser Verlag: Switzerland.)