Temporal niche switching by grizzly bears but not American black bears in Yellowstone National Park
نویسندگان
چکیده
منابع مشابه
Trophic cascades from wolves to grizzly bears in Yellowstone.
We explored multiple linkages among grey wolves (Canis lupus), elk (Cervus elaphus), berry-producing shrubs and grizzly bears (Ursus arctos) in Yellowstone National Park. We hypothesized competition between elk and grizzly bears whereby, in the absence of wolves, increases in elk numbers would increase browsing on berry-producing shrubs and decrease fruit availability to grizzly bears. After wo...
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During the past 2 decades, the grizzly bear (Ursus arctos) population in the Greater Yellowstone Ecosystem (GYE) has increased in numbers and expanded in range. Understanding temporal, environmental, and spatial variables responsible for this change is useful in evaluating what likely influenced grizzly bear demographics in the GYE and where future management efforts might benefit conservation ...
متن کاملModels for management of wildlife populations: lessons from spectacled bears in zoos and grizzly bears in Yellowstone
Models of population dynamics are frequently used in the management and conservation of wildlife populations. They provide a powerful method of quantitatively assessing a population’s risk of decline and determining the potential to reverse the decline. Models from recent studies of managed populations are presented. The first model simulates the spectacled bear populations maintained in Americ...
متن کاملSummary and explanation of methods to estimate population size and sustainable mortality of Yellowstone grizzly bears
Charles R. Anderson, Jr., Trophy Game Section, Wyoming Game and Fish Department, Lander, WY 82520, USA Keith Aune, Research and Technical Services, Montana Fish, Wildlife and Parks, Helena, MT 59620, USA Kim Barber, U.S. Department of Agriculture, Forest Service, Shoshone National Forest, Cody, WY 82414, USA Dan Bjornlie, Trophy Game Section, Wyoming Game and Fish Department, Lander, WY 82520, ...
متن کاملMama Grizzly and the polar bears.
A recent paper on the matrilineal population history of two sister species, Ursus maritimus (polar bears) and Ursus arctos (brown bears), based on mtDNA sequence analysis, reveals a comparatively recent introgression. The authors propose that it represents a signature of environ mental stress in marginal habitats [1]. In a nutshell, it means that all modern polar bears probably belong to a mate...
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ژورنال
عنوان ژورنال: Journal of Mammalogy
سال: 2013
ISSN: 0022-2372,1545-1542
DOI: 10.1644/12-mamm-a-238.1