Pre-print (10.32942/osf.io/nygu7) revised after one round of peer review 1 Experimentally testing the response of feral cats and their prey to poison baiting 2 3 Tim S. Doherty1, Michelle L. Hall2,3,4, Ben Parkhurst2, Vanessa Westcott2 4 1 School of Life and Environmental Sciences, University of Sydney, Sydney, New South Wales, Australia. 5
[email protected] 6 2 Bush Heritage Australia, 1/395 Collins St, Melbourne, Victoria, Australia 7 3 School of Biological Sciences, The University of Western Australia, Perth, Western Australia, Australia 8 4 School of BioSciences, The University of Melbourne, Melbourne, Victoria, Australia 9 10 Abstract 11 Context Feral cats Felis catus have caused the decline and extinction of many species worldwide, 12 particularly on islands and in Australia where native species are generally naïve to the threat of 13 this introduced predator. Effectively reducing cat populations to protect wildlife is challenging 14 because cats have a cryptic nature, high reproductive rate and strong reinvasion ability. 15 Aims We experimentally tested the response of feral cats and their native prey to an Eradicat® 16 poison baiting program at a conservation reserve. 17 Methods Baits were distributed by hand along roads and tracks every 50 m (~10 baits km-2). We 18 used camera traps to monitor the response of cats to baiting using a repeated before-after, 19 control-impact design over six years. We also measured introduced rabbit Oryctolagus cuniculus 20 activity using sand pads and small mammal and reptile captures using pitfall trapping. 21 Key results Dynamic occupancy modelling revealed only modest effects of baiting on cats in two 22 out of six years, with occupancy in the baited area decreasing from 54% to 19% in 2014 (-35%) 23 and 89% to 63% in 2017 (-26%).