Specific ecological features of the brown bear (Ursus arctos L. 1758) in Yakutia

Akhremenko, A. K.; Седалищев, В Т

doi:10.1134/s1067413608030065

Cited by 3 publications

(2 citation statements)

References 2 publications

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“…As a general rule, the duration of hibernation in different brown bear populations seems to be conditioned by both snowfall/snow depth in autumn (Akhremenko & Sedalishchev, 2008;Craighead & Craighead, 1972;Friebe et al, 2001;Manchi & Swenson, 2005) and snowmelt in spring Schoen et al, 1987). Snowfall can act as a major impetus to begin hibernation (Craighead & Craighead, 1972;Friebe et al, 2001;Manchi & Swenson, 2005;Reynolds, Curatolo, & Quimby, 1976;Servheen & Klaver, 1983), with bears generally entering dens after first snowfall (Craighead & Craighead, 1972;Evans et al, 2016;Manchi & Swenson, 2005), although occasional snowstorms seem not to act as a stimulus for den entry (Judd et al, 1986;Van Daele et al, 1990).…”

Section: Influence Of Environmental Factorsmentioning

confidence: 99%

Denning in brown bears

González-Bernardo

Russo

Valderrábano

et al. 2020

Ecology and Evolution

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Hibernation represents an adaptation for coping with unfavorable environmental conditions. For brown bears Ursus arctos, hibernation is a critical period as pronounced temporal reductions in several physiological functions occur. Here, we review the three main aspects of brown bear denning: (1) den chronology, (2) den characteristics, and (3) hibernation physiology in order to identify (a) proximate and ultimate factors of hibernation as well as (b) research gaps and conservation priorities. Den chronology, which varies by sex and reproductive status, depends on environmental factors, such as snow, temperature, food availability, and den altitude. Significant variation in hibernation across latitudes occurs for both den entry and exit. The choice of a den and its surroundings may affect individual fitness, for example, loss of offspring and excessive energy consumption. Den selection is the result of broad‐ and fine‐scale habitat selection, mainly linked to den insulation, remoteness, and availability of food in the surroundings of the den location. Hibernation is a metabolic challenge for the brown bears, in which a series of physiological adaptations in tissues and organs enable survival under nutritional deprivation, maintain high levels of lipids, preserve muscle, and bone and prevent cardiovascular pathologies such as atherosclerosis. It is important to understand: (a) proximate and ultimate factors in denning behavior and the difference between actual drivers of hibernation (i.e., factors to which bears directly respond) and their correlates; (b) how changes in climatic factors might affect the ability of bears to face global climate change and the human‐mediated changes in food availability; (c) hyperphagia (period in which brown bears accumulate fat reserves), predenning and denning periods, including for those populations in which bears do not hibernate every year; and (d) how to approach the study of bear denning merging insights from different perspectives, that is, physiology, ecology, and behavior.

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Section: Influence Of Environmental Factorsmentioning

confidence: 99%

Denning in brown bears

González-Bernardo

Russo

Valderrábano

et al. 2020

Ecology and Evolution

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“…These are species whose protection might result in the simultaneous protection of other species due to their large home ranges and overlap in habitat preferences with other species (Roberge and Angelstam, 2004). Brown bears (Ursus arctos) are being suggested to act as an 'umbrella' species in this region, due to their omnivorous diet and large distribution and their attractiveness (Krechmar, 1995). Additionally, they are protected by law in Armenia (with large nes for killing one; Armenian Parliament, 2005) and are listed as "Vulnerable" according to The National Red Book of Animals for the Republic of Armenia (Aghasyan and Kalashyan, 2010).…”

Section: Introductionmentioning

confidence: 99%

Where the wild bears roam: Examining the habitat preferences and distribution of brown bears (Ursus arctos) in Armenia

Bartzokas

Ralev

Sluydts

et al. 2023

Preprint

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Understanding the habitat preferences and temporal activity of Armenian brown bears (Ursus arctos) in relation to human presence and the presence of other mammalian species in a biodiversity hotspot region is essential for their conservation. In this study we investigated how human disturbance affects the brown bear's temporal and spatial activity in the privately protected Caucasus Wildlife Refuge (CWR) of Armenia. In addition, we investigated spatio-temporal distribution of brown bear in relation to other wildlife present in the study area and looked at its habitat preferences. We placed 28 camera traps were placed in areas inside or adjacent to CWR for a period of 3 months in 2018. Presence/absence data were used to calculate the species richness and activity patterns and inserted in different occupancy models for the bears and the other mammals found in the area. Of the 14 medium and large-sized mammal species that could theoretically live in the area, we recorded 13, four of which are listed in the Red Book of Animals of Armenia (including the very rare Caucasian leopard). The results showed that brown bears are, to a certain extent habituated to human presence, since they were found near human settlements. Areas closer to water bodies were also found to be more likely occupied by brown bears. In addition, brown bear presence had a positive effect on the occupancy of potential prey species. The activity pattern analysis revealed that there is some diel temporal partitioning present between brown bear's and other mammalian species' activity.

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Variability of the Brown Bear and the Problem of Decreased Individual Size

Puchkovskiy

2022

Biol Bull Rev

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Specific ecological features of the brown bear (Ursus arctos L. 1758) in Yakutia

Cited by 3 publications

References 2 publications

Denning in brown bears

Denning in brown bears

Where the wild bears roam: Examining the habitat preferences and distribution of brown bears (Ursus arctos) in Armenia

Variability of the Brown Bear and the Problem of Decreased Individual Size

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