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- Evans, Alina L., et al.
(författare)
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Capture, Anesthesia, and Disturbance of Free-Ranging Brown Bears (Ursus arctos) during Hibernation
- 2012
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Ingår i: PLOS ONE. - : Public Library of Science. - 1932-6203. ; 7:7
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Tidskriftsartikel (refereegranskat)abstract
- We conducted thirteen immobilizations of previously collared hibernating two-to four-year-old brown bears (Ursus arctos) weighing 21-66 kg in central Sweden in winter 2010 and 2011 for comparative physiology research. Here we report, for the first time, an effective protocol for the capture and anesthesia of free-ranging brown bears during hibernation and an assessment of the disturbance the captures caused. Bears were darted in anthill, soil, or uprooted tree dens on eleven occasions, but two bears in rock dens fled and were darted outside the den. We used medetomidine at 0.02-0.06 mg/kg and zolazepam-tiletamine at 0.9-2.8 mg/kg for anesthesia. In addition, ketamine at 1.5 mg/kg was hand-injected intramuscularly in four bears and in six it was included in the dart at 1.1-3.0 mg/kg. Once anesthetized, bears were removed from the dens. In nine bears, arterial blood samples were analyzed immediately with a portable blood gas analyzer. We corrected hypoxemia in seven bears (PaO2 57-74 mmHg) with supplemental oxygen. We placed the bears back into the dens and antagonized the effect of medetomidine with atipamezole. Capturing bears in the den significantly increased the risk of den abandonment. One of twelve collared bears that were captured remained at the original den until spring, and eleven, left their dens (mean +/- standard deviation) 3.2 +/- 3.6 (range 0.5-10.5) days after capture. They used 1.9 +/- 0.9 intermediate resting sites, during 6.2 +/- 7.8 days before entering a new permanent den. The eleven new permanent dens were located 730 +/- 589 m from the original dens. We documented that it was feasible and safe to capture hibernating brown bears, although they behaved differently than black bears. When doing so, researchers should use 25% of the doses used for helicopter darting during the active period and should consider increased energetic costs associated with den abandonment.
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| 2. |
- Stoen, Ole-Gunnar, et al.
(författare)
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Physiological evidence for a human-induced landscape of fear in brown bears (Ursus arctos)
- 2015
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Ingår i: Physiology and Behavior. - : Elsevier. - 0031-9384 .- 1873-507X. ; 152:A, s. 244-248
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Tidskriftsartikel (refereegranskat)abstract
- Human persecution is a major cause of mortality for large carnivores. Consequently, large carnivores avoid humans, but may use human-dominated landscapes by being nocturnal and elusive. Behavioral studies indicate that certain ecological systems are "landscapes of fear", driven by antipredator behavior. Because behavior and physiology are closely interrelated, physiological assessments may provide insight into the behavioral response of large carnivores to human activity. To elucidate changes in brown bears' (Ursus arctos) behavior associated with human activity, we evaluated stress as changes in heart rate (HR) and heart rate variability (HRV) in 12 GPS-collared, free-ranging bears, 7 males and 5 females, 3-11 years old, using cardiac-monitoring devices. We applied generalized linear regression models with HR and HRV as response variables and chest activity, time of day, season, distance traveled, and distance to human settlements from GPS positions recorded every 30 mm as potential explanatory variables. Bears exhibited lower HRV, an indication of stress, when they were close to human settlements and especially during the berry season, when humans were more often in the forest, picking berries and hunting. Our findings provide evidence of a human-induced landscape of fear in this hunted population of brown bears. (C) 2015 The Authors. Published by Elsevier Inc. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
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| 3. |
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| 6. |
- Frank, Jens, et al.
(författare)
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Human behaviour can trigger large carnivore attacks in developed countries
- 2016
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Ingår i: Scientific Reports. - : Springer Science and Business Media LLC. - 2045-2322. ; 6
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Tidskriftsartikel (refereegranskat)abstract
- The media and scientific literature are increasingly reporting an escalation of large carnivore attacks on humans in North America and Europe. Although rare compared to human fatalities by other wildlife, the media often overplay large carnivore attacks on humans, causing increased fear and negative attitudes towards coexisting with and conserving these species. Although large carnivore populations are generally increasing in developed countries, increased numbers are not solely responsible for the observed rise in the number of attacks by large carnivores. Here we show that an increasing number of people are involved in outdoor activities and, when doing so, some people engage in risk-enhancing behaviour that can increase the probability of a risky encounter and a potential attack. About half of the well-documented reported attacks have involved risk-enhancing human behaviours, the most common of which is leaving children unattended. Our study provides unique insight into the causes, and as a result the prevention, of large carnivore attacks on people. Prevention and information that can encourage appropriate human behaviour when sharing the landscape with large carnivores are of paramount importance to reduce both potentially fatal human-carnivore encounters and their consequences to large carnivores.
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| 7. |
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| 8. |
- Johansson, Maria, et al.
(författare)
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An Evaluation of Information Meetings as a Tool for Addressing Fear of Large Carnivores
- 2017
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Ingår i: Society and Natural Resources. - : Informa UK Limited. - 0894-1920 .- 1521-0723. ; 30:3, s. 281-298
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Tidskriftsartikel (refereegranskat)abstract
- Managing authorities in Scandinavia arrange public information meetings when members of the public express fear because wolves or brown bears approach human settlements. This study aimed to increase the understanding of the potential effect of information meetings on self-reported fear of wolves and brown bears. In total, 198 participants completed questionnaires before and after the information meetings. Nine follow-up interviews were held 1 year later. The quantitative analyses revealed that participants who found the information credible reported a significant increase in social trust and a decrease in vulnerability and fear. The qualitative analyses pointed to the importance of information content and meta-communication, for example, nonverbal cues. It is proposed that, among participants who find the information credible, information meetings may change the appraisal of wolves and brown bears, and therefore they might prove useful as an intervention to address fear of these animals.
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| 9. |
- Johansson, Maria, et al.
(författare)
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Communication interventions and fear of brown bears: Considerations of content and format
- 2019
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Ingår i: Frontiers in Ecology and Evolution. - : Frontiers Media SA. - 2296-701X. ; 7
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Tidskriftsartikel (refereegranskat)abstract
- Communication interventions are commonly proposed as a way to address people's fear and negative attitudes to build tolerance in shared landscapes between humans and large carnivores. Therefore, managing authorities sometimes respond to people's fear of brown bears (Ursus arctos) by organizing an information meeting. This study increases the understanding of the information meeting to address fear of encountering brown bears. Using a mixed-method approach the study analyzes the explicit meta-communication, i.e., verbal interactions to coordinate communication between presenter and participants, the effects of the meeting on fear and fear-related variables over time, and how these effects compare with the effects of a visit to a permanent brown bear exhibition, and the effects of a guided walk with exposure to brown bears and their habitat as two alternative communication interventions. Participation in information meetings contributed to reduce self-reported fear and the effect lasted over at least 6 months. The information meetings were, as assessed immediately after participation, less efficient than participation in a guided walk, but more efficient than a visit to a permanent brown bear exhibition in reducing fear. The content and format of the meeting was in line with the expectations of an information meeting, e.g., the presenter dominated the initiative in the explicit meta-communication, but still allowing for misconceptions and misunderstandings to be addressed and solved. In the development of communication strategies to address fear of large carnivores, managing authorities should pay attention to details in information content and format as well as to trade-offs between the number of people reached by the intervention and the strength of the effects on fear and fear-related variables among participants.
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| 10. |
- Johansson, Maria, et al.
(författare)
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Targeting human fear of large carnivores — Many ideas but few known effects
- 2016
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Ingår i: Biological Conservation. - : Elsevier BV. - 0006-3207 .- 1873-2917. ; 201, s. 261-269
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Forskningsöversikt (refereegranskat)abstract
- This paper reviews the peer-reviewed scientific literature on interventions aimed to reduce human fear of large carnivores in human-large carnivore conflicts. Based on psychological theories, a wide definition of fear was adopted, including fear as an emotion, as a perception and as an attitude. Four major categories of interventions were identified: information and education, exposure to animal and habitat, collaboration and participation, and financial incentives. Each of these categories may have a potential to reduce fear responses. The scientific literature on the effect of interventions addressing human fear of large carnivores is scarce and partly contradictory, which makes it difficult for wildlife managers to rely on current research when designing appropriate interventions.
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