Efficacy of bear spray as a deterrent against polar bears. (14th December 2022)

• Record Type: Journal Article
• Authors: Wilder, James M.; Mangipane, Lindsey S.; Atwood, Todd; Kochnev, Anatoly; Smith, Tom; Vongraven, Dag
• Is Part Of: Wildlife Society bulletin. Volume 47:Number 1(2023)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2022-12-14
• Subjects: attacks -- bear spray -- climate change -- conflicts -- conservation -- deterrents -- human‐bear conflicts -- polar bear -- Ursus maritimus; Wildlife management -- Periodicals; Wildlife conservation -- Periodicals; 333.9540973
• DOI: 10.1002/wsb.1403
• Languages: English
• ISSNs: 0091-7648

Abstract

Abstract: Although there have been few attempts to systematically analyze information on the use of deterrents on polar bears ( Ursus maritimus ), understanding their effectiveness in mitigating human‐polar bear conflicts is critical to ensuring both human safety and polar bear conservation. To fill this knowledge gap, we analyzed 19 incidents involving the use of bear spray on free‐ranging polar bears from 1986 to 2019 in Canada, Russia, and the United States to evaluate the effectiveness of bear spray as a polar bear deterrent. We found that bear spray was an effective deterrent in close‐range encounters with polar bears, stopping undesirable behavior in 18 of 19 incidents. Bear spray effectively deterred both curious and aggressive polar bears, including polar bears attempting to attack people. The mean distance between user and bear at the time of spraying was 2 m (min–max = 0.2–10.0 m, mode = 1 m), though bears were usually first seen at greater distances. Bear spray was successfully deployed against polar bears in all 4 seasons. Wind affected spray performance in 1 of 19 of incidents. In 8 of 14 bear spray incidents, other deterrents were used without success before bear spray was used effectively to deter polar bears. No humans or polar bears were killed or injured in any of the incidents in which bear spray was used. We also analyzed 54 polar bear attacks and attempted attacks on humans where bear spray was not carried. The data suggest that in 93% of those incidents, the use of bear spray might have saved the lives of both the people and bears involved if it had been available and used. Our analysis improves our understanding of the effectiveness of bear spray for polar bear conflict mitigation. Abstract : Understanding the effectiveness of bear spray in mitigating human‐polar bear conflicts is an important step for improving both human safety and polar bear conservation. We analyzed incidents involving the use of bear spray on non‐captive polar bears in Canada, Russia, and the United States from 1986–2019 and found that it is an effective deterrent in close‐range encounters. Additionally, bear spray effectively deterred both curious and aggressive polar bears, including bears attempting to attack people.