Black bear translocations in response to nuisance behaviour indicate increased effectiveness by translocation distance and landscape context
Javan M. Bauder
A D , Nathan M. Roberts B , David Ruid C , Bruce Kohn B and Maximilian L. Allen A
+ Author Affiliations
- Author Affiliations
A Illinois Natural History Survey, Prairie Research Institute, University of Illinois, 1816 South Oak Street, Champaign, IL 61820, USA.
B Wisconsin Department of Natural Resources, 107 Sutliff Avenue, Rhinelander, WI 54501, USA.
C United States Department of Agriculture Animal and Plant Health Inspection Service, Wildlife Services, P.O. Box 1064, Rhinelander, WI 54501, USA.
D Corresponding author. Email: javanvonherp@gmail.com
Wildlife Research 47(5) 426-435 https://doi.org/10.1071/WR19161
Submitted: 8 September 2019 Accepted: 18 March 2020 Published: 9 July 2020
Abstract
Context: Translocation is a widely used non-lethal tool to mitigate human–wildlife conflicts, particularly for carnivores. Multiple intrinsic and extrinsic factors may influence translocation success, yet the influence of release-site landscape context on the success of translocations of wildlife involved in nuisance behaviour is poorly understood. Moreover, few studies of translocated wildlife involved in nuisance behaviour have provided estimates of translocation success under different scenarios.
Aims: We evaluated the role of intrinsic (age, sex) and extrinsic (translocation distance, landscape composition) features on translocation success of American black bears (Ursus americanus) involved in nuisance behaviour and provide spatially explicit predictions of success under different scenarios.
Methods: We analysed data from 1462 translocations of 1293 bears in Wisconsin, USA, from 1979 to 2016 and evaluated two measures of translocation success: repeated nuisance behaviour and probability of returning to a previous capture location.
Key results: Translocation distances ranged from 2 to 235 km (mean = 57 km). Repeated nuisance behaviour was recorded following 13.2% of translocation events (192 of 1457) and was not significantly affected by translocation distance. Bears repeated nuisance behaviour and were recaptured at their previous captures site (i.e. returned) after 64% of translocation events (114 of 178). Return probability decreased with an increasing translocation distance, and yearling bears were less likely to return than were adults. The proportions of agriculture and forest within 75 km and 100 km respectively, of the release site had positive and negative effects on return probability.
Conclusions: Mangers can use bear characteristics and landscape context to improve translocation success. For example, achieving a 10% predicted probability of return would require translocation distances of 49–60 km for yearlings in low-agriculture and high-forest landscapes. In contrast, estimated return probability for adults was ≥38% across all translocation distances (0–124 km) and almost all landscape contexts.
Implications: Our results emphasise the importance of considering the effects of landscape conditions for developing spatially explicit guidelines for maximising translocation success.
Additional keywords: agriculture, human–wildlife conflict, nuisance wildlife, Ursus americanus.
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