Experimentally testing the response of feral cats and their prey to poison baiting
Tim S. Doherty
A B F , Michelle L. Hall C D E , Ben Parkhurst C and Vanessa Westcott C
+ Author Affiliations
- Author Affiliations
A School of Life and Environmental Sciences, The University of Sydney, Camperdown, NSW 2006, Australia.
B Centre for Integrative Ecology, School of Life and Environmental Sciences, Deakin University, 221 Burwood Highway, Burwood, Vic. 3125, Australia.
C Bush Heritage Australia, 1/395 Collins Street, Melbourne, Vic. 3000, Australia.
D School of Biological Sciences, The University of Western Australia, 35 Stirling Highway, Perth, WA 6009, Australia.
E School of BioSciences, The University of Melbourne, Melbourne, Vic. 3010, Australia.
F Corresponding author. Email: tim.doherty@sydney.edu.au
Wildlife Research 49(2) 137-146 https://doi.org/10.1071/WR21008
Submitted: 13 January 2021 Accepted: 16 June 2021 Published: 20 August 2021
Journal Compilation © CSIRO 2022 Open Access CC BY
Abstract
Context: Feral cats, Felis catus, have caused the decline and extinction of many species worldwide, particularly on islands and in Australia where native species are generally naïve to the threat of this introduced predator. Effectively reducing cat populations to protect wildlife is challenging because cats have a cryptic nature, high reproductive rate and strong reinvasion ability.
Aims: We experimentally tested the response of feral cats and their native prey to an Eradicat® poison baiting program at a conservation reserve.
Methods: Baits were distributed by hand along roads and tracks every 50 m (~10 baits km−2). We used camera traps to monitor the response of cats to baiting using a repeated before–after, control–impact design over 6 years. We also measured introduced rabbit, Oryctolagus cuniculus, activity by using sand pads and small mammal and reptile captures by using pitfall trapping.
Key results: Dynamic occupancy modelling showed only modest effects of baiting on cats in 2 of 6 years, with occupancy in the baited area decreasing from 54% to 19% in 2014 (–35%) and from 89% to 63% in 2017 (–26%). Baiting effectiveness was not related to antecedent rainfall or prey availability. Bait availability was reduced by non-target interference; 73% of 41 monitored baits were removed by non-target species. We found no evidence for persistent changes in small mammal or reptile capture rates in the baited area relative to the unbaited area over the life of the project.
Conclusions: Relatively low baiting density and non-target interference with baits are likely to have reduced baiting efficacy. Further testing and refinement of ground baiting is needed, including trialling higher baiting densities and/or frequencies.
Implications: We highlight key areas for future research that should benefit feral cat management not only in Australia, but also on the many islands worldwide where cats threaten native wildlife.
Keywords: cat baiting, dynamic occupancy model, impact evaluation, invasive predator, lethal control, pest control.
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