Evaluating and predicting risk to a large reptile (Varanus varius) from feral cat baiting protocols

Jessop, Tim S., Kearney, Michael R., Moore, Joslin L., Lockwood, Tim and Johnston, Michael 2013, Evaluating and predicting risk to a large reptile (Varanus varius) from feral cat baiting protocols, Biological invasions, vol. 15, no. 8, pp. 1653-1663, doi: 10.1007/s10530-012-0398-3.

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Title Evaluating and predicting risk to a large reptile (Varanus varius) from feral cat baiting protocols
Author(s) Jessop, Tim S.ORCID iD for Jessop, Tim S. orcid.org/0000-0002-7712-4373
Kearney, Michael R.
Moore, Joslin L.
Lockwood, Tim
Johnston, Michael
Journal name Biological invasions
Volume number 15
Issue number 8
Start page 1653
End page 1663
Total pages 11
Publisher Springer
Place of publication Berlin, Germany
Publication date 2013-08
ISSN 1387-3547
Summary Control of introduced predators to mitigate biodiversity impacts is a pressing conservation challenge. Across Australia feral cats (Felis catus) are a major threat to terrestrial biodiversity. Currently feral cat control is hindered by the limited utility of existing predator baiting methods. Further proposed control methods include use of the novel poison para-aminopropiophenone (PAPP) which may present a hazard to some native animal populations. Here we used experimental and predictive approaches to evaluate feral cat bait take by a large native Australian predatory reptile the Lace monitor (Varanus varius). These lizards would be expected to readily detect, ingest and consume a lethal dose (depending on toxin) from surface-laid baits intended for feral cat control if a precautionary approach was not adopted when baiting. We modelled V. varius bait take using experimental and predictive biophysical modelling approaches to evaluate temporal effects of climate variables on V. varius activity and hence potential for bait removal. Finally we conducted a pre-PAPP baiting site occupancy assessment of V. varius within Wilson Promontory National Park (WPNP) to provide a basis for monitoring any longer term population effects of cat baiting. V. varius removed 7 % of deployed baits from 73 % of bait stations across another study area in Far Eastern Victoria. Daily bait removal was positively correlated with maximum temperature and solar radiation. Biophysical modelling for Far Eastern Victoria predicted that maximum temperatures <19.5 °C prevented V. varius activity and hence opportunity for bait removal. V. varius in WPNP was undetectable suggesting aerial baiting posed limited hazard to this species at this location. Depending how climate influences annual activity patterns and the specific poison, surface-laid baits could pose a significant mortality risk to V. varius. However, use of biophysical models to predict periods of V. varius inactivity may provide a novel means to reduce non-target bait take by this predator.
Language eng
DOI 10.1007/s10530-012-0398-3
Field of Research 060801 Animal Behaviour
050202 Conservation and Biodiversity
050103 Invasive Species Ecology
05 Environmental Sciences
06 Biological Sciences
Socio Economic Objective 970106 Expanding Knowledge in the Biological Sciences
HERDC Research category C1.1 Refereed article in a scholarly journal
ERA Research output type C Journal article
Copyright notice ©2013, Springer
Persistent URL http://hdl.handle.net/10536/DRO/DU:30081790

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