Travis Wyman- National Park Service
Travis Wyman
- National Park Service
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11
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Publications (11)
In North America, polar bears (Ursus maritimus), grizzly bears (U. arctos), and American black bears (U. americanus) occasionally injure or kill humans. Although bear-inflicted human injuries are uncommon, they generate media attention that can lead to fear and unreasonable perceptions of the risk of bear attacks. Information on the behavioral resp...
This article provides information on the range of grizzly bear behavioral responses to encounters with people in Yellowstone National Park. The article also provides recommended methods to reduce the frequency of encounters and the risk of grizzly bear attack.
The negative impacts on bears (Ursus spp.) from human activities associated with roads and developments are well documented. These impacts include displacement of bears from high-quality foods and habitats, diminished habitat effectiveness, and reduced survival rates. Additionally, increased public visitations to national parks accompanied with ben...
Prey switching occurs when a generalist predator kills disproportionately more of an abundant prey species and correspondingly spares a rarer species. Although this behaviour is a classic stabilizing mechanism in food web models, little is known about its operation in free‐living systems which often include dangerous prey species that resist predat...
41 23(2) • 2015 Yellowstone Science L arge party sizes have been shown to reduce the risk of bear attack (Herrero 2002). In addition, bear deterrent spray has proven effective at reducing aggressive behavior by bears during surprise encounters (Herrero and Higgins 1998, Smith et al. 2008). To reduce the risk of bear attack in Yellowstone National P...
Spawning Yellowstone cutthroat trout (Oncorhynchus clarki) provide a source of highly digestible energy for grizzly bears (Ursus arctos) that visit tributary streams to Yellowstone Lake during the spring and early summer. During 1985–87, research documented grizzly bears fishing on 61% of the 124 tributary streams to the lake. Using track measureme...
