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

How many reptiles are killed by cats in Australia?

J. C. Z. Woinarski A J , B. P. Murphy A , R. Palmer B , S. M. Legge C , C. R. Dickman D , T. S. Doherty E , G. Edwards F , A. Nankivell G , J. L. Read H and D. Stokeld I
+ Author Affiliations
- Author Affiliations

A NESP Threatened Species Recovery Hub, Research Institute for the Environment and Livelihoods, Charles Darwin University, Casuarina, NT 0909, Australia.

B Department of Biodiversity, Conservation and Attractions, Locked Bag 104, Bentley Delivery Centre, WA 6983, Australia.

C NESP Threatened Species Recovery Hub, Centre for Biodiversity and Conservation Research, University of Queensland, St Lucia, Qld 4072, Australia.

D NESP Threatened Species Recovery Hub, Desert Ecology Research Group, School of Life and Environmental Sciences A08, University of Sydney, NSW 2006, Australia.

E Deakin University, School of Life and Environmental Sciences, Centre for Integrative Ecology (Burwood Campus), Geelong, Vic. 3220, Australia.

F Department of Environment and Natural Resources, PO Box 1120, Alice Springs, NT 0871, Australia.

G Nature Foundation SA Inc., PO Box 448, Hindmarsh, SA 5007, Australia.

H University of Adelaide, School of Earth and Environmental Sciences, SA 5000, Australia.

I Department of Environment and Natural Resources, Berrimah, NT 0820, Australia.

J Corresponding author. Email: john.woinarski@cdu.edu.au

Wildlife Research 45(3) 247-266 https://doi.org/10.1071/WR17160
Submitted: 10 November 2017  Accepted: 18 March 2018   Published: 15 June 2018

Abstract

Context: Feral cats (Felis catus) are a threat to biodiversity globally, but their impacts upon continental reptile faunas have been poorly resolved.

Aims: To estimate the number of reptiles killed annually in Australia by cats and to list Australian reptile species known to be killed by cats.

Methods: We used (1) data from >80 Australian studies of cat diet (collectively >10 000 samples), and (2) estimates of the feral cat population size, to model and map the number of reptiles killed by feral cats.

Key results: Feral cats in Australia’s natural environments kill 466 million reptiles yr–1 (95% CI; 271–1006 million). The tally varies substantially among years, depending on changes in the cat population driven by rainfall in inland Australia. The number of reptiles killed by cats is highest in arid regions. On average, feral cats kill 61 reptiles km–2 year–1, and an individual feral cat kills 225 reptiles year–1. The take of reptiles per cat is higher than reported for other continents. Reptiles occur at a higher incidence in cat diet than in the diet of Australia’s other main introduced predator, the European red fox (Vulpes vulpes). Based on a smaller sample size, we estimate 130 million reptiles year–1 are killed by feral cats in highly modified landscapes, and 53 million reptiles year–1 by pet cats, summing to 649 million reptiles year–1 killed by all cats. Predation by cats is reported for 258 Australian reptile species (about one-quarter of described species), including 11 threatened species.

Conclusions: Cat predation exerts a considerable ongoing toll on Australian reptiles. However, it remains challenging to interpret the impact of this predation in terms of population viability or conservation concern for Australian reptiles, because population size is unknown for most Australian reptile species, mortality rates due to cats will vary across reptile species and because there is likely to be marked variation among reptile species in their capability to sustain any particular predation rate.

Implications: This study provides a well grounded estimate of the numbers of reptiles killed by cats, but intensive studies of individual reptile species are required to contextualise the conservation consequences of such predation.

Additional keywords: conservation, diet, introduced predator, island, mortality, predation.


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