Killer cats

Killer cats

Hot Topics in Ecology

Killer cats

Synthesis by Tim Doherty, Centre for Ecosystem Management, Edith Cowan University
Feral cats are a major threat to Australian biodiversity. Photo: J Dunlop.

The domestic cat (Felis catus) was introduced to Australia by Europeans and now inhabits all of mainland Australia, Tasmania and a number of offshore islands. Feral cats are opportunistic, generalist carnivores and their potential impacts include: predation, competition and disease transmission.

The recent Action Plan named feral cats as the number one threat to endangered mammals and Federal Environment Minister, Greg Hunt, has called for the 'eradicat[ion] of all significant populations of feral cats' within a decade.

Cats prey on at least 400 native and introduced vertebrates in Australia, including 123 birds, 157 reptiles, 58 marsupials, 27 rodents and 21 frogs. Cats have played a key role in the extinction of at least 22 mammals, and are a current threat to several threatened mammal and bird species. Most evidence for the population-level impacts of feral cats has been gleaned from historical patterns of decline and extinction, or from the failure of reintroduction attempts for threatened mammal species. The small amount of experimental work that has been done confirms that cats can suppress and exterminate small mammal populations.

The impacts of competition and disease transmission are less clear. Overlap in resource use between cats and native predators suggests competition may exist, although this has not been confirmed experimentally. Cats carry the parasite Toxoplasma gondii, which can cause death for many marsupials. High prevalence of Toxoplasma antibodies has been recorded in some marsupial populations, although it is not known how infection might alter their behaviour or susceptibility to predation.

Further research into the non-lethal impacts of cats is necessary, as well as a better understanding of the relationship between cats, other predators and their prey.

Hot Topic Lead Author: 
Name: Tim Doherty

Date approved: 
Sunday, May 8, 2016 - 18:48
ID Title Location Type
7500 Woinarski, J.C.Z., Burbidge, A.A., Harrison, P.L., 2015. Ongoing unraveling of a continental fauna: Decline and extinction of Australian mammals since European settlement. Proceedings of the National Academy of Sciences. doi:10.1073/pnas.1417301112 Australia Review
7399 Marlow N J, et al. (2015) Cats (Felis catus) are more abundant and are the dominant predator of woylies (Bettongia penicillata) after sustained fox (Vulpes vulpes) control. Australia Dryandra, Tutanning, Highbury and Quinn's block. WA Manipulative experiment
7340 Bettiol S. S., Obendorf D. L., Nowarkowski M. & Goldsmid, J. M. (2000) Pathology of experimental toxoplasmosis in eastern barred bandicoots in Tasmania. J. Wildl. Dis. 36, 141–144. Tasmania Manipulative experiment, lab study
7341 Burbidge A. A. (1999) Conservation values and management of Australian islands for non-volant mammal conservation. Australian Mammalogy. 21, 67–74. Australian islands Correlational
7342 Canfield P. J., Hartley W. J. & Dubey J. P. (1990) Lesions of toxoplasmosis in Australian marsupials. J. Comp. Pathol. 103, 159–167. Australia Review
7343 Christensen P. & Burrows N. (1994) Project desert dreaming: experimental reintroduction of mammals to the Gibson Desert, Western Australia. In: Reintroduction Biology of Australian and New Zealand Fauna (ed M. Serena) pp. 199–207 Surrey Beatty & Sons, C Gibson Desert Nature Reserve, WA Observational field study
7344 Department of the Environment Water Heritage and the Arts (2008) Threat abatement plan for predation by feral cats. DEWHA, Canberra. Australia Review, policy document
7345 Doherty T.S., Davis R.A., van Etten E.J.B., Algar D., Collier N., Dickman C.R., Edwards G., Masters P., Palmer R. & Robinson S. (2015) A continental-scale analysis of feral cat diet in Australia. Journal of Biogeography, doi:10.1111/jbi.12469 Australia Quantitative review
7346 Eymann J., Herbert C. A., Cooper D. W. & Dubey J. P. (2006) Serologic survey for Toxoplasma gondii and Neospora caninum in the common brushtail possum (Trichosurus vulpecula) from urban Sydney, Australia. J. Parasitol. 92, 267–272. Sydney, NSW Pre-existing gradient, field study
7347 Fancourt B. A. & Jackson R. B. (2014) Regional seroprevalence of Toxoplasma gondii antibodies in feral and stray cats (Felis catus) from Tasmania. Australian Journal of Zoology. 62, 272–283. Tasmania Pre-existing gradient, field study
7348 Fancourt B. A., Nicol S. C., Hawkins C. E., Jones M. E. & Johnson C. N. (2014) Beyond the disease: Is Toxoplasma gondii infection causing population declines in the eastern quoll (Dasyurus viverrinus)? International Journal for Parasitology: Parasites and Tasmania Pre-existing gradient, field study
7349 Frank A. S. K., Johnson C. N., Potts J. M., Fisher A., Lawes M. J., Woinarski J. C. Z., Tuft K., Radford I. J., Gordon I. J., Collis M.-A. & Legge S. (2014) Experimental evidence that feral cats cause local extirpation of small mammals in Australia's trop Wongalara Wildlife Sanctuary , NT Manipulative experiment, field study
7350 Gibson D. F., Johnson K. A., Langford D. G., Cole J. R., Clarke D. E. & Willowra Community (1994) The Rufous Hare-wallaby Lagorchestes hirsutus: a history of experimental reintroduction in the Tanami Desert, Northern Territory. In: Reintroduction Biology Tanami Desert, NT Observational field study
7351 Hollings T., Jones M., Mooney N. & McCallum H. (2013) Wildlife disease ecology in changing landscapes: Mesopredator release and toxoplasmosis. International Journal for Parasitology: Parasites and Wildlife. 2, 110–118. Tasmania Pre-existing gradient, field study
7352 Johnson C. (2006) Australia's Mammal Extinctions: A 50 000 year history. Cambridge University Press, Melbourne. Australia Review
7353 Moseby K. E., Hill B. M. & Read J. L. (2009) Arid Recovery - A comparison of reptile and small mammal populations inside and outside a large rabbit, cat and fox-proof exclosure in arid South Australia. Austral Ecology. 34, 156–169. Arid Recovery, Roxby Downs, SA Manipulative experiment, field study
7354 Moseby K. E., Read J. L., Paton D. C., Copley P., Hill B. M. & Crisp H. A. (2011) Predation determines the outcome of 10 reintroduction attempts in arid South Australia. Biological Conservation. 144, 2863–2872. Arid Recovery, Roxby Downs, SA Observational, field study
7355 Obendorf D. L., Statham P. & Driessen M. (1996) Detection of agglutinating antibodies to Toxoplasma gondii in sera from free-ranging eastern barred bandicoots (Perameles gunnii). J. Wildl. Dis. 32, 623–626. Tasmania Observational, field study
7356 Pan S., Thompson R. C. A., Grigg M. E., Sundar N., Smith A. & Lymbery A. J. (2012) Western Australian Marsupials Are Multiply Infected with Genetically Diverse Strains of Toxoplasma gondii (ed I. Igarashi). PLoS ONE. 7, e45147. Menzies, WA Pre-existing gradient, field and lab study
7357 Parameswaran N., O'Handley R. M., Grigg M. E., Fenwick S. G. & Thompson R. C. A. (2009) Seroprevalence of Toxoplasma gondii in wild kangaroos using an ELISA. Parasitology International. 58, 161–165. Perth, WA Pre-existing gradient, field study
7358 Priddel D. & Wheeler R. (2004) An experimental translocation of brush-tailed bettongs (Bettongia penicillata) to western New South Wales. Wildlife Research. 31, 421–432. Yathong Nature Reserve, NSW Observational, field study
7359 Reddacliff G. L., Hartley W. J., Dubey J. P. & Cooper D. W. (1993) Pathology of experimentally-induced, acute toxoplasmosis in macropods. Aust. Vet. J. 70, 4–6. NSW Manipulative experiment, lab study
7360 Risbey D. A., Calver M. C., Short J., Bradley J. S. & Wright I. W. (2000) The impact of cats and foxes on the small vertebrate fauna of Heirisson Prong, Western Australia. II. A field experiment. Wildlife Research. 27, 223–235. Shark Bay, WA Manipulative experiment, field study
7361 Robinson S. A. & Copson G. R. (2014) Eradication of cats (Felis catus) from subantarctic Macquarie Island. Ecological Management & Restoration. 15, 34–40. Macquarie Island Observational, field study
7362 Salo P., Korpimaki E., Banks P. B., Nordstrom M. & Dickman C. R. (2007) Alien predators are more dangerous than native predators to prey populations. Proceedings of the Royal Society B: Biological Sciences. 274, 1237–1243. Global Meta-analysis
7363 Smith A. P. & Quin D. G. (1996) Patterns and causes of extinction and decline in Australian Conilurine Rodents. Biological Conservation. 77, 243–267. Australia Review paper, modelling
7364 Woinarski J. C. Z., Burbidge A. A. & Harrison P. (2014) The action plan for Australian mammals 2012. CSIRO Publishing, Melbourne. Australia Review