No mammal recovery from feral cat experimental exclusion trials in Kakadu National Park
Danielle Stokeld
A D , Alaric Fisher A , Tim Gentles A , Brydie M. Hill A , John C. Z. Woinarski B and Graeme R. Gillespie A C
+ Author Affiliations
- Author Affiliations
A Flora and Fauna Division, Northern Territory Department of Environment, Parks and Water Security, Palmerston, NT 0831, Australia.
B Charles Darwin University, Casuarina, NT 0909, Australia.
C School of Biosciences, University of Melbourne, Parkville, Vic. 3100, Australia.
D Corresponding author. Email: dstokeld@gmail.com
Wildlife Research 49(4) 335-346 https://doi.org/10.1071/WR21073
Submitted: 30 April 2021 Accepted: 25 September 2021 Published: 22 December 2021
Abstract
Context: Small and medium-sized native mammals have declined precipitously across northern Australia. Feral cats have been implicated in causing declines and ongoing suppression of populations.
Aims: The aim of the present study was to evaluate the response of small and medium-sized native mammal populations when cat predation was removed.
Methods: A field experiment was conducted in a tropical savanna environment of northern Australia. Three experimental treatments were applied to six plots to compare and contrast responses of native mammals to predator exclusion and the additive effects of frequent fire. Plots were monitored regularly between 2013 and 2017.
Key results: After 4 years of monitoring, no significant difference in capture rates of native mammals was detected between cat-accessible plots and those where they were excluded.
Conclusions: There was no evidence of population recovery of native mammals in response to predator exclusion. There was some evidence that frequent burning, independent of cat exclusion, adversely affects native mammal diversity.
Implications: Although predation by feral cats is a major threat to small and medium-sized native mammals, disturbance from fire, and grazing by introduced herbivores, have been shown to significantly impede native mammal population recovery in tropical savanna ecosystems. Management programs that solely focus on suppressing feral cat populations may be inadequate in ameliorating ongoing mammal declines in landscapes with other significant disturbance regimes.
Keywords: burning regimes, cat exclosure, exclusion trials, feral cat, invasive species, Kakadu National Park, mammal decline, mammal recovery, population recovery, predator exclusion, predator-proof fence, threatened species.
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