Effects of low-level culling of feral cats in open populations: a case study from the forests of southern Tasmania
Billie T. Lazenby A B D , Nicholas J. Mooney C and Christopher R. Dickman A
+ Author Affiliations
- Author Affiliations
A School of Biological Sciences, A08, University of Sydney, NSW 2006, Australia.
B Department of Primary Industries, Parks, Water and Environment, 134 Macquarie Street, Hobart, Tas. 7000, Australia.
C PO Box 120, Richmond, Tas. 7025, Australia.
D Corresponding author. Email: Billie.Lazenby@dpipwe.tas.gov.au
Wildlife Research 41(5) 407-420 https://doi.org/10.1071/WR14030
Submitted: 12 February 2014 Accepted: 18 October 2014 Published: 20 February 2015
Abstract
Context: Feral cats (Felis catus) threaten biodiversity in many parts of the world, including Australia. Low-level culling is often used to reduce their impact, but in open cat populations the effectiveness of culling is uncertain. This is partly because options for assessing this management action have been restricted to estimating cat activity rather than abundance.
Aims: We measured the response, including relative abundance, of feral cats to a 13-month pulse of low-level culling in two open sites in southern Tasmania.
Methods: To do this we used remote cameras and our analysis included identification of individual feral cats. We compared estimates of relative abundance obtained via capture–mark–recapture and minimum numbers known to be alive, and estimates of activity obtained using probability of detection and general index methods, pre- and post-culling. We also compared trends in cat activity and abundance over the same time period at two further sites where culling was not conducted.
Key results: Contrary to expectation, the relative abundance and activity of feral cats increased in the cull-sites, even though the numbers of cats captured per unit effort during the culling period declined. Increases in minimum numbers of cats known to be alive ranged from 75% to 211% during the culling period, compared with pre- and post-cull estimates, and probably occurred due to influxes of new individuals after dominant resident cats were removed.
Conclusions: Our results showed that low-level ad hoc culling of feral cats can have unwanted and unexpected outcomes, and confirmed the importance of monitoring if such management actions are implemented.
Implications: If culling is used to reduce cat impacts in open populations, it should be as part of a multi-faceted approach and may need to be strategic, systematic and ongoing if it is to be effective.
References
Algar, D., and Burrows, N. D. (2004). Feral cat control research: Western Shield review – February 2003. Conservation Science Western Australia 5, 131–163.Algar, D. A., Burbidge, A. A., and Angus, G. J. (2002). Cat eradication on Hermite Island, Montebello Islands, Western Australia. In ‘Turning the Tide: the Eradication of Invasive Species’. (Eds C. R Veitch and M. N. Clout.) pp. 14–18. (IUCN: Gland, Switzerland.)
Algar, D., Angus, G. J., Williams, M. R., and Mellican, A. E. (2007). Influence of bait type, weather and prey abundance on bait uptake by feral cats (Felis catus) on Peron Peninsula, Western Australia. Conservation Science Western Australia 6, 109–149.
Bengsen, A., Butler, J., and Masters, P. (2011). Estimating and indexing feral cat population abundances using camera traps. Wildlife Research 38, 732–739.
| Estimating and indexing feral cat population abundances using camera traps.Crossref | GoogleScholarGoogle Scholar |
Bergstrom, D. M., Lucieer, A., Kiefer, K., Wasley, J., Belbin, L., Pedersen, T. K., and Chown, S. L. (2009). Indirect effects of invasive species removal devastate World Heritage island. Journal of Applied Ecology 46, 73–81.
| Indirect effects of invasive species removal devastate World Heritage island.Crossref | GoogleScholarGoogle Scholar |
Booth, C. (2010). Hunting and feral animal control: conservation or con? In ‘Convergence or Conflict: Animal Welfare in Wildlife Management and Conservation’. (Eds M. Tensen and B. Jones.) pp. 25–31. (RSPCA Australia: Canberra.)
Braysher, M. (1993). ‘Managing Vertebrate Pests: Principles and Strategies.’ (Bureau of Resource Sciences: Canberra.)
Bruinzeel, L. W., and van de Pol, M. (2004). Site attachment of floaters predicts success in territory acquisition. Behavioral Ecology 15, 290–296.
| Site attachment of floaters predicts success in territory acquisition.Crossref | GoogleScholarGoogle Scholar |
Burnham, K. P., and Anderson, D. R. (2002). ‘Model Selection and Multimodel Inference: a Practical Information-theoretic Approach’. 2nd edn. (Springer-Verlag: Berlin.)
Campbell, K. J., Harper, G., Algar, D., Hanson, C. C., Keitt, B. S., and Robinson, S. (2011). Review of feral cat eradication on islands. In ‘Island Invasives: Eradication and Management’. (Eds C. R. Veitch, M. N. Clout and D. R. Towns.) pp. 37–46. (IUCN: Gland, Switzerland.)
Carter, S. P., Delahay, R. J., Smith, G. C., Macdonald, D. W., Riordan, P., Etherington, T. R., Pimley, E. R., Walker, N. J., and Cheeseman, C. L. (2007). Culling-induced social perturbation in Eurasian badgers Meles meles and the management of TB in cattle: an analysis of a critical problem in applied ecology. Proceedings. Biological Sciences 274, 2769–2777.
| Culling-induced social perturbation in Eurasian badgers Meles meles and the management of TB in cattle: an analysis of a critical problem in applied ecology.Crossref | GoogleScholarGoogle Scholar |
Cavallini, P. (1996). Variation in the social system of the red fox. Ethology Ecology and Evolution 8, 323–342.
| Variation in the social system of the red fox.Crossref | GoogleScholarGoogle Scholar |
Coman, B. (1991). The ecology and control of feral cats in Australia. In ‘The Impact of Cats on Native Wildlife’. (Ed. C. Potter.) pp. 70–74. (Australian National Parks and Wildlife Service: Canberra.)
Dards, J. L. (1983). The behaviour of dockyard cats: interaction of adult males. Applied Animal Ethology 10, 133–153.
| The behaviour of dockyard cats: interaction of adult males.Crossref | GoogleScholarGoogle Scholar |
Denny, E. A. (2005). Ecology of free-living cats exploiting waste disposal sites: diet, morphometrics, population dynamics and population genetics. Ph.D. Thesis, University of Sydney, Sydney.
Denny, E. A., and Dickman, C. R. (2010). ‘Review of Cat Ecology and Management Strategies in Australia.’ (Invasive Animals Cooperative Research Centre: Canberra.)
Denny, E., Yakovlevich, P., Eldridge, M. D. B., and Dickman, C. R. (2002). Social and genetic analysis of a population of free-living cats (Felis catus L.) exploiting a resource-rich habitat. Wildlife Research 29, 405–413.
| Social and genetic analysis of a population of free-living cats (Felis catus L.) exploiting a resource-rich habitat.Crossref | GoogleScholarGoogle Scholar |
DEWHA (2008). ‘Threat Abatement Plan for Predation by Feral Cats.’ (Department of Environment, Water, Heritage and the Arts: Canberra.)
Dickman, C. R. (1996). ‘Overview of the Impacts of Feral Cats on Australian Native Fauna.’ (Australian Nature Conservation Agency: Canberra.)
Dickman, C. R., Denny, E., and Buckmaster, T. (2010). Identification of sites of high conservation priority impacted by feral cats. Report for the Department of the Environment, Water, Heritage and the Arts, Canberra.
Domm, S., and Messersmith, J. (1990). Feral cat eradication on a Barrier Reef island, Australia. Atoll Research Bulletin 338, 1–4.
| Feral cat eradication on a Barrier Reef island, Australia.Crossref | GoogleScholarGoogle Scholar |
Doncaster, C. P., and Macdonald, D. W. (1991). Drifting territoriality in the red fox Vulpes vulpes. Journal of Applied Ecology 60, 423–439.
| Drifting territoriality in the red fox Vulpes vulpes.Crossref | GoogleScholarGoogle Scholar |
Donovan, T. M., and Hines, J. (2007). Exercises in occupancy modeling and estimation. Available at http://www.uvm.edu/envnr/vtcfwru/spreadsheets/occupancy.htm. [Verified October 2013]
DPIPWE (2008). ‘Cat Management in Tasmania: Taking the Initiative.’ (Department of Primary Industries, Parks, Water and Environment: Hobart.)
DPIPWE (2009). ‘Tasmanian Community Forest Agreement Research into Alternatives to 1080, Newsletter 17.’ (Department of Primary Industries, Parks, Water and Environment: Hobart.)
Efford, M. G., and Fewster, R. M. (2013). Estimating population size by spatially explicit capture–recapture. Oikos 122, 918–928.
| Estimating population size by spatially explicit capture–recapture.Crossref | GoogleScholarGoogle Scholar |
Engeman, R. M. (2005). Indexing principles and a widely applicable paradigm for indexing animal populations. Wildlife Research 32, 203–210.
| Indexing principles and a widely applicable paradigm for indexing animal populations.Crossref | GoogleScholarGoogle Scholar |
Fisher, P., Algar, D., and Johnston, M. (2001). Current and future feral cat control management for conservation outcomes. In ‘Veterinary Conservation Biology; Wildlife Health and Management in Australasia: Proceedings of an International Joint Conference, Taronga Zoo, Sydney, Australia 1–6 July 2001’. (Eds A. Martin and L. Vogelnest.) pp. 1–8. (Australian Veterinary Association: Canberra.)
Forsyth, D. M., Robley, A. J., and Reddiex, B. (2005). ‘Review of Methods used to Estimate the Abundance of Feral Cats.’ (Arthur Rylah Institute for Environmental Research, Department of Sustainability and Environment: Melbourne.)
Friday, N., Smith, T. D., Stevick, P. T., and Allen, J. (2000). Measurement of photographic quality and individual distinctiveness for the photographic identification of humpback whales, Megaptera novaeanglia. Marine Mammal Science 16, 355–374.
| Measurement of photographic quality and individual distinctiveness for the photographic identification of humpback whales, Megaptera novaeanglia.Crossref | GoogleScholarGoogle Scholar |
Hanke, P. U., and Dickman, C. R. (2013). Sniffing out the stakes: hair-snares for wild cats in arid environments. Wildlife Research 40, 45–51.
| Sniffing out the stakes: hair-snares for wild cats in arid environments.Crossref | GoogleScholarGoogle Scholar |
Harding, E. K., Doak, D. F., and Albertson, J. D. (2001). Evaluating the effectiveness of predator control: the non-native red fox as a case study. Conservation Biology 15, 1114–1122.
| Evaluating the effectiveness of predator control: the non-native red fox as a case study.Crossref | GoogleScholarGoogle Scholar |
Hayne, D. W. (1949). An examination of the strip census method for estimating animal populations. The Journal of Wildlife Management 13, 145–157.
| An examination of the strip census method for estimating animal populations.Crossref | GoogleScholarGoogle Scholar |
Hines, J. E. (2006). ‘PRESENCE2: Software to Estimate Patch Occupancy and Related Parameters.’ (USGS–PWRC.) Available at http://www.mbr_pwrc.usgs.gov/software/presence.html. [Verified month year]
Hone, J. (2007). ‘Wildlife Damage Control.’ (CSIRO Publishing: Melbourne.)
Huggins, R. M. (1989). On the statistical analysis of capture experiments. Biometrika 76, 133–140.
| On the statistical analysis of capture experiments.Crossref | GoogleScholarGoogle Scholar |
Jackson, R. M., Roe, J. D., Wangchuck, R., and Hunter, D. O. (2006). Estimating snow leopard population abundance using photography and capture–recapture techniques. Wildlife Society Bulletin 34, 772–781.
| Estimating snow leopard population abundance using photography and capture–recapture techniques.Crossref | GoogleScholarGoogle Scholar |
Karanth, K. U., and Nichols, J. D. (1998). Estimation of tiger densities in India using photographic captures and recaptures. Ecology 79, 2852–2862.
| Estimation of tiger densities in India using photographic captures and recaptures.Crossref | GoogleScholarGoogle Scholar |
Kelly, M. J., Noss, A. J., Di Bitetti, M. S., Maffei, L., Arispe, R. L., Paviolo, A., De Angelo, C. D., and Di Blanco, Y. E. (2008). Estimating puma densities from camera trapping across three study sites: Bolivia, Argentina and Belize. Journal of Mammalogy 89, 408–418.
| Estimating puma densities from camera trapping across three study sites: Bolivia, Argentina and Belize.Crossref | GoogleScholarGoogle Scholar |
Kerby, G., and Macdonald, D. W. (1994). Cat society and the consequences of colony size. In ‘The Domestic Cat: the Biology of its Behaviour’. (Eds D. C. Turner and P. Bateson.) pp. 67–81. (Cambridge University Press: Cambridge, UK.)
King, C., and Powell, R. (2011). Managing an invasive predator pre-adapted to a pulsed resource: a model of stoat (Mustela erminea) irruptions in New Zealand beech forests. Biological Invasions 13, 3039–3055.
| Managing an invasive predator pre-adapted to a pulsed resource: a model of stoat (Mustela erminea) irruptions in New Zealand beech forests.Crossref | GoogleScholarGoogle Scholar |
King, C. M., Innes, J. G., Fitzgerald, N., Winstanley, T., O’Brien, B., Bridgman, L., and Cox, N. (2011). Reinvasion by ship rats (Rattus rattus) of forest fragments after eradication. Biological Invasions 13, 2391–2408.
| Reinvasion by ship rats (Rattus rattus) of forest fragments after eradication.Crossref | GoogleScholarGoogle Scholar |
Lane, C., Bengsen, A., and Murphy, E., eds. (2013). ‘Proceedings of the National Feral Cat Management Workshop, Mantra Southbank, Melbourne, Australia, 30 November, 2010.’ (Invasive Animals Cooperative Research Centre: Canberra.)
Lazenby, B. T. (2012). Do feral cats affect small mammals? A case study from the forests of southern Tasmania. Ph.D. Thesis, University of Sydney.
Lazenby, B. T., and Dickman, C. R. (2013). Patterns of detection and capture are associated with cohabiting predators and prey. PLoS ONE 8, e59846.
| Patterns of detection and capture are associated with cohabiting predators and prey.Crossref | GoogleScholarGoogle Scholar | 23565172PubMed |
Liberg, O. (1984). Home range and territoriality in free ranging house cats. Acta Zoologica Fennica 171, 283–285.
Long, R. A., Mackay, P., Ray, J., and Zielinski, W. (2008). ‘Non-Invasive Survey Methods for Carnivores.’ (Island Press, University of Michigan: Ann Arbor, MI.)
Loss, S. R., Will, T., and Marra, P. P. (2013). The impact of free-ranging domestic cats on wildlife of the United States. Nature Communications 4, 1396.
| The impact of free-ranging domestic cats on wildlife of the United States.Crossref | GoogleScholarGoogle Scholar | 23360987PubMed |
MacKenzie, D. I., Nichols, J. D., Royle, J. A., Pollock, K. H., Bailey, L. L., and Hines, J. E. (2006). ‘Occupancy Estimation and Modeling: Inferring Patterns and Dynamics of Species Occurrence.’ (Elsevier: London.)
Mahon, P. S., Banks, P. B., and Dickman, C. R. (1998). Population indices for wild carnivores: a critical study in sand-dune habitat, south-western Queensland. Wildlife Research 25, 11–22.
| Population indices for wild carnivores: a critical study in sand-dune habitat, south-western Queensland.Crossref | GoogleScholarGoogle Scholar |
Markowitz, T. M., Harlin, A. D., and Wursig, B. (2003). Digital photography improves efficiency of individual dolphin identification. Marine Mammal Science 19, 217–223.
| Digital photography improves efficiency of individual dolphin identification.Crossref | GoogleScholarGoogle Scholar |
Meek, P. D., Ballard, G., and Fleming, P. (2012). ‘An Introduction to Camera Trapping for Wildlife Surveys in Australia. PestSmart Toolkit Publication.’ (Invasive Animals Cooperative Research Centre: Canberra.)
Moseby, K. E., Stott, J., and Crisp, H. (2009a). Movement patterns of feral predators in an arid environment – implications for control through poison baiting. Wildlife Research 36, 422–435.
Moseby, K. E., Hill, B. M., and Read, J. L. (2009b). 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 – a comparison of reptile and small mammal populations inside and outside a large rabbit, cat and fox-proof exclosure in arid South Australia.Crossref | GoogleScholarGoogle Scholar |
Nogales, M., Martín, A., Tershy, B. R., Donlan, C. J., Veitch, D., Puerta, N., Wood, B., and Alonso, J. (2004). A review of feral cat eradication on islands. Conservation Biology 18, 310–319.
| A review of feral cat eradication on islands.Crossref | GoogleScholarGoogle Scholar |
Nogales, M., Vidal, E., Medina, F. M., Bonnaud, E., Tershy, B. R., Campbell, K. J., and Zavaleta, E. S. (2013). Feral cats and biodiversity conservation: the urgent prioritization of island management. Bioscience 63, 804–810.
| Feral cats and biodiversity conservation: the urgent prioritization of island management.Crossref | GoogleScholarGoogle Scholar |
Olsen, P. (1998). ‘Australia’s Pest Animals: New Solutions to Old Problems.’ (Bureau of Resource Sciences: Canberra; and Kangaroo Press: Sydney.)
Otis, D. L., Burnham, K. P., White, G. C., and Anderson, D. R. (1978). Statistical inference from capture data on closed animal populations. Wildlife Monographs 62, 1–135.
Pollock, K. H., and Otto, M. C. (1983). Robust estimation of population size in closed animal populations from capture–recapture experiments. Biometrics 39, 1035–1049.
| Robust estimation of population size in closed animal populations from capture–recapture experiments.Crossref | GoogleScholarGoogle Scholar | 6671118PubMed |
Read, J., and Bowen, Z. (2001). Population dynamics, diet and aspects of the biology of feral cats and foxes in arid South Australia. Wildlife Research 28, 195–203.
| Population dynamics, diet and aspects of the biology of feral cats and foxes in arid South Australia.Crossref | GoogleScholarGoogle Scholar |
Reddiex, B., and Forsyth, D. (2004). Review of existing red fox, wild dog, feral cat, rabbit, feral pig and feral goat control in Australia. II. Information gaps. Unpublished final report for the Department of the Environment and Heritage, Canberra.
Reddiex, B., Forsyth, D., McDonald-Madden, E., Einoder, L. D., Griffion, P. A., Chick, R. R., and Robley, A. J. (2004). Review of existing red fox, wild dog, feral cat, feral rabbit, feral pig, and feral goat control in Australia. I. Audit. Report for the Department of the Environment and Heritage, Canberra.
Reddiex, B., Forsyth, D. M., McDonald-Madden, E., Einoder, L. D., Griffioen, P. A., Chick, R. R., and Robley, A. J. (2006). Control of pest mammals for biodiversity protection in Australia. I. Patterns of control and monitoring. Wildlife Research 33, 691–709.
| Control of pest mammals for biodiversity protection in Australia. I. Patterns of control and monitoring.Crossref | GoogleScholarGoogle Scholar |
Rexstad, E., and Burnham, K. P. (1991). ‘User’s Guide for Interactive Program CAPTURE. Abundance Estimation of Closed Animal Populations.’ (Colorado State University: Fort Collins, CO.)
Robley, A., Gormley, A., Woodford. L., Lindeman, M., Whitehead, B., Albert, R., Bowd, M., and Smith, A. (2010). Evaluation of camera trap sampling designs used to determine change in occupancy rate and abundance of feral cats. Technical Report No. 201.Arthur Rylah Institute for Environmental Research, Melbourne.
Sharp, T., and Saunders, G. (2005). ‘Humane Pest Animal Control: Codes of Practice and Standard Operating Procedures.’ (New South Wales Department of Primary Industries: Orange, NSW.)
Short, J., Turner, B., Risbey, D. A., and Carnamah, R. (1997). Control of feral cats for nature conservation. II. Population reduction by poisoning. Wildlife Research 24, 703–714.
| Control of feral cats for nature conservation. II. Population reduction by poisoning.Crossref | GoogleScholarGoogle Scholar |
Sinclair, A. R. E., Fryxell, J. M., and Caughley, G. (2006). ‘Wildlife Ecology, Conservation, and Management.’ 2nd edn. (Blackwell Publishing: Oxford, UK.)
Slooten, E., Dawson, S. M., and Lad, F. (1992). Survival rates of photographically identified Hector’s dolphins from 1984 to 1998. Marine Mammal Science 8, 327–343.
| Survival rates of photographically identified Hector’s dolphins from 1984 to 1998.Crossref | GoogleScholarGoogle Scholar |
Soulé, M. E., Bolger, D. T., Alberts, A. C., Wright, J., Sorice, M., and Hill, S. (1988). Reconstructed dynamics of rapid extinctions of chaparral-requiring birds in urban habitat islands. Conservation Biology 2, 75–92.
| Reconstructed dynamics of rapid extinctions of chaparral-requiring birds in urban habitat islands.Crossref | GoogleScholarGoogle Scholar |
Stokes, V. L., Pech, R. P., Banks, P. B., and Arthur, A. D. (2004). Foraging behaviour and habitat use by Antechinus flavipes and Sminthopsis murina (Marsupialia: Dasyuridae) in response to predation risk in eucalypt woodland. Biological Conservation 117, 331–342.
| Foraging behaviour and habitat use by Antechinus flavipes and Sminthopsis murina (Marsupialia: Dasyuridae) in response to predation risk in eucalypt woodland.Crossref | GoogleScholarGoogle Scholar |
Turner, D., and Bateson, C. (2000). ‘The Domestic Cat: the Biology of its Behaviour.’ (Cambridge University Press: Cambridge, UK.)
White, G., and Burnham, K. P. (1999). ‘Program MARK.’ (Colorado State University: Fort Collins, CO.) Available at http://www.phidot.org/software/mark. [Verified month year]
Williams, B. K., Nichols, J. D., and Conroy, M. J. (2002). ‘Analysis and Management of Animal Populations: Modelling, Estimation and Decision Making.’ (Academic Press: San Diego, CA.)
