Occupancy and abundance of free-roaming cats in a fragmented agricultural ecosystem
Sarah C. Webster
A D , Zachary H. Olson B and James C. Beasley C
+ Author Affiliations
- Author Affiliations
A Savannah River Ecology Laboratory, Warnell School of Forestry and Natural Resources, University of Georgia, P.O. Drawer E, Aiken, SC 29802, USA.
B Department of Psychology, University of New England, 11 Hills Beach Road, Biddeford, ME 04005, USA.
C Savannah River Ecology Laboratory, Warnell School of Forestry and Natural Resources, University of Georgia, P.O. Drawer E, Aiken, SC 29802, USA.
D Corresponding author. Email: swebster@uga.edu
Wildlife Research 46(4) 277-284 https://doi.org/10.1071/WR18029
Submitted: 21 February 2018 Accepted: 23 January 2019 Published: 4 June 2019
Abstract
Context: Free-roaming domestic cats are a widespread invasive species, occurring throughout the globe in urban and rural environments alike. However, robust estimates of cat occupancy and abundance, especially in rural, agricultural landscapes, are largely unknown.
Aims: To estimate cat occupancy and abundance within forested habitat in a fragmented agricultural region of Indiana, USA.
Methods: Free-roaming cats in 55 forest patches were captured from 2004 to 2010 to assess the effects of landscape attributes on cat occupancy probabilities. During 2009–10 abundance of cats in each habitat patch was estimated based on natural markings of captured individuals.
Key results: Across the entire study (2004–10) cats in 50 of the 55 patches were detected, but detections varied temporally and spatially. Average occupancy probability was estimated at Ψ = 0.773 (s.e. = 0.109), and detection probability was estimated as P = 0.204 (s.e. = 0.012). Distance to human structures and forest patch isolation both were found to negatively influence cat occupancy. In total, 57 individual cats were captured in 2009 and 55 in 2010, when unique individuals were distinguished. Across all forest patches, average cat abundance was n = 1.08 in 2009 and n = 0.91 in 2010, ranging from 0 to 7 among sampled patches.
Conclusions: Overall, the distribution of free-roaming cats across a rural agricultural landscape varied temporally and was associated with proximity to human structures and the proximity of other forest habitat. Similarly, abundance was found to vary spatially and temporally.
Implications: The findings suggest free-roaming cats are widespread throughout agricultural ecosystems, but their distribution is dynamic and non-random. Additionally, the potential for cats to impact native fauna inhabiting remnant forest patches is high in fragmented agricultural ecosystems due to the concentration of native species utilising these patches. Further research is needed to determine the effects free-roaming cats are having on native species in human-dominated, rural ecosystems, and what conservation measures might be implemented to best mitigate any impacts.
Additional keywords: distribution, landscape fragmentation.
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