Factors influencing the success of hand-reared juvenile brushtail possums (Trichosurus vulpecula) released into the wild
Valentina S. A. Mella
A B * , Callum Gillies B C , Clare McArthur B , Elliot Webb B and Catherine Herbert B
+ Author Affiliations
- Author Affiliations
A Sydney School of Veterinary Science, The University of Sydney, Sydney, NSW 2006, Australia.
B School of Life and Environmental Sciences, The University of Sydney, Sydney, NSW 2006, Australia.
C Victoria Department of Environment, Land, Water and Planning, Water and Catchments, Melbourne, Vic., Australia.
Wildlife Research 50(2) 96-107 https://doi.org/10.1071/WR22056
Submitted: 25 March 2022 Accepted: 26 May 2022 Published: 26 July 2022
© 2023 The Author(s) (or their employer(s)). Published by CSIRO Publishing. This is an open access article distributed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License (CC BY-NC-ND)
Abstract
Context: Wildlife is ubiquitous in urban environments, resulting in frequent interactions with humans and human infrastructure. The result of these interactions is often negative, in the form of road injury, orphaning of dependent young or eviction from natural home ranges. Wildlife rehabilitation programmes are devised to counter these negative interactions. However, the success of current management strategies is rarely assessed.
Aims: We aimed to determine whether short-term survival of juvenile hand-reared common brushtail possums (Trichosurus vulpecula) released in the wild was a function of (1) intrinsic factors such as sex, individual personality and level of human habituation, and (2) extrinsic factors such as release practice (soft vs hard-release) or location (urban vs rural). We also evaluated the relationship between habituation to humans and time spent in care by possums, if presence of conspecifics during the rehabilitation process influenced the development of individual personality, and if this differed in hand-raised animals compared with wild individuals.
Methods: We radio-tracked and monitored 20 hand-reared juvenile possums (10 females and 10 males) for up to 40 days after release in the wild.
Key results: Eight possums (40%) survived until the end of the study, nine possums (45%) were killed by foxes or had to be returned into care and three possums (15%) had unknown fates (i.e. lost VHF signal). We found that more exploratory individuals and those less human-habituated were more likely to be successful in the wild in both rural and urban areas, whether or not they were hard or soft released.
Conclusions: Our results suggest that personality is a key criterion to consider when evaluating the success of rehabilitation programmes. Behavioural traits of hand-reared brushtail possums differed significantly from those of wild individuals, showing that captive conditions can affect the development of personality. Hand-reared possums that spent more time in care were also more likely to display highly human-habituated behaviours.
Implications: By demonstrating which factors influence success of hand-reared wildlife after release in the wild, our results help in evaluating current rearing and release practices, and improve the evidence base for developing best practice wildlife rehabilitation guidelines.
Keywords: exploration, hand-rearing, human habituation, marsupial, personality, post-release monitoring, survival, wildlife rehabilitation.
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