Performance of GPS collars on free-ranging bison (Bison bison) in north-western Canada
Thomas S. Jung A B and Kazuhisa Kuba A
+ Author Affiliations
- Author Affiliations
A Yukon Department of Environment, PO Box 2703, Whitehorse, Yukon, Y1A 2C6, Canada.
B Corresponding author. Email: thomas.jung@gov.yk.ca
Wildlife Research 42(4) 315-323 https://doi.org/10.1071/WR15038
Submitted: 11 February 2015 Accepted: 15 June 2015 Published: 12 August 2015
Abstract
Context: Global positioning system (GPS) collars are increasingly used to study animal ecology. However, understanding their real-world performance is important so that biases in data collection can be addressed. These biases may be species specific. Few studies have examined the influence of sex or temporal variation on locational fix success rates (FSR), and none has assessed GPS-collar performance on bison (Bison bison).
Aims: To test for sex- and temporal-based biases on the performance of GPS collars on free-ranging bison.
Methods: Data from 59 deployments of 37 GPS collars on 27 female and seven male bison was used to test for temporal variation and differences between sexes on collar-deployment success rates and four fix acquisition metrics.
Key results: Most (72.9%) of the 55 GPS collars retrieved malfunctioned before reaching their expected deployment schedule (2 years). We observed a significant difference in the performance of GPS collars deployed on male and females, with those on females functioning almost three times longer. All four fix metrics differed between sexes, with males having significantly better metrics. For females, nightly fix metrics were better than the daytime ones, whereas for males, there was no difference. We observed a significant difference in fix metrics between seasons for females, but not males.
Conclusions: Although the data from GPS collars may be useful in understanding animal ecology, understanding associated biases can aid in the design of field studies using, and the interpretation of results stemming from, GPS collars. Temporal variation in our study was apparent for females, but not males, and likely related to differences in habitat use and movements. Overall, sex had a significant influence on the success of GPS-collar deployments on bison, and should be examined for other species as well.
Implications: Bison damage to the collars was the main reason for collar failures. Researchers should plan for catastrophic failures and malfunctions when deploying GPS collars on bison, particularly adult males. Significant differences observed between daily and seasonal FSR for females were small (≤4.9%), and do not warrant post hoc treatment before analyses.
Additional keywords: American bison, fix success rate, GPS transmitter, PDOP.
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