Northern Rocky Mountain Science Center

Publications

Below is a list of available NOROCK peer reviewed and published science. If you are in search of a specific publication and cannot find it below or through a search, please contact twojtowicz@usgs.gov.

Filter Total Items: 990
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Year Published: 1992

Yellowstone grizzly bear mortality, human habituation, and whitebark pine seed crops

The Yellowstone grizzly bear (Ursus arctos horribilis) population may be extirpated during the next 100-200 years unless mortality rates stabilize and remain at acceptable low levels. Consequently, we analyzed relationships between Yellowstone grizzly bear mortality and frequency of human habituation among bears and size of the whitebark pine (...

Mattson, David J.; Blanchard, Bonnie M.; Knight, Richard R.
Yellowstone grizzly bear mortality, human habituation, and whitebark pine seed crops; 1992; Article; Journal; The Journal of Wildlife Management; Mattson, David J.; Blanchard, Bonnie M.; Knight, Richard R.

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Year Published: 1992

The track of the Yellowstone hot spot--volcanism, faulting and uplift

Abstract has not been submitted

Link, P.K.; Kuntz, M.A.; Platt, L.W.; Pierce, K.L.; Morgan, L.A.
The track of the Yellowstone hot spot--volcanism, faulting and uplift; 1992; Book chapter; BOOK; Regional geology of eastern Idaho and western Wyoming: Geological Society of America Memoir 179 (in honor of Steve Oriel); Pierce, K. L.; Morgan, L.A.

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Year Published: 1991

Conservation of the Yellowstone grizzly bear

We review literature relevant to the conservation of Yellowstone's grizzly bear population and appraise the bear's long-term viability. We conclude that the population is isolated and vulnerable to epidemic perturbation and that the carrying capacity of the habitat is likely to shift downward under conditions of climate change. Viability analyses...

Mattson, David J.; Reid, Matthew M.

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Year Published: 1991

Analysis and modeling of long‐term stream temperatures on the Steamboat Creek Basin, Oregon: Implications for land use and fish habitat

Steamboat Creek basin is an important source of timber and provides crucial spawning and rearing habitat for anadromous steelhead trout (Oncorhynchus mykiss). Because stream temperatures are near the upper limit of tolerance for the survival of juvenile steelhead, the possible long‐term effect of clear‐cut logging on stream temperatures was...

Hostetler, Steven W.

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Year Published: 1991

Movements of Yellowstone grizzly bears

Ninety-seven grizzly bears Ursus arctos horribilis were radio-located 6299 times during 1975–1987. Annual range sizes differed by sex, age, reproductive status and amount of precipitation. Females exhibited greater fidelity to seasonal and annual ranges than males. Weaned female offspring generally remained in the vicinity of the maternal...

Blanchard, Bonnie M.; Knight, Richard R.
Movements of yellowstone grizzly bears; 1991; Article; Journal; Biological Conservation; Blanchard, Bonnie M.; Knight, Richard R.

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Year Published: 1990

Simulation of lake evaporation with application to modeling lake level variations of Harney‐Malheur Lake, Oregon

A physically based eddy diffusion model for simulating the seasonal variation in lake temperature and evaporation is presented and validated. Because no lake‐specific fitting of the parameters of the model is necessary, the model can be used to simulate evaporation in studies of climate change and lake hydrology in a variety of settings. The eddy...

Hostetler, Steven W.; Bartlein, Patrick J

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Year Published: 1990

Human impacts on bear habitat use

: Human effects on bear habitat use are mediated through food biomass changes, bear tolerance of humans and their impacts, and human tolerance of bears. Large-scale changes in bear food biomass have been caused by conversion of wildlands and waterways to intensive human use, and by the introduction of exotic pathogens. Bears consume virtually all...

Mattson, David J.

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Year Published: 1990

Bear use of cutthroat trout spawning streams in Yellowstone National Park

Grizzly bears (Ursus arctos) and black bears (U. americanus) prey on spawning cutthroat trout (Oncorhynchus clarki, formerly known as Salmo clarki) in tributary streams of Yellowstone Lake. These tributary streams were surveyed from 1985 to 1987 to determine the presence and level of trout spawning activity and bear use. Indices were developed to...

Reinhart, Daniel P.; Mattson, D.J.

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Year Published: 1990

Predatory behavior of grizzly bears feeding on elk calves in Yellowstone National Park

Grizzly bears (Ursus arctos horribilis) were observed preying on elk calves (Cervus elaphus) on 60 occasions in Yellowstone National Park, with 29 confirmed kills. Some bears were deliberate predators and effectively preyed on elk calves for short periods each spring, killing up to 1 calf daily. Primary hunting techniques were searching and...

French, Steven P.; French, Marilynn G.

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Year Published: 1990

Fluctuating asymmetry and testing isolation of Montana grizzly bear populations

Fluctuating asymmetry of adult skulls was used to test he genetic isolation of the Yellowstone grizzly bear population from its nearest neighbor. An overall summary statistic was used in addition to 16 other parameters. Tests found the males of the Yellowstone populaion to be more vaiable than those of the North Conitinental Divide Exosystem....

Picton, Harold D.; Palmisciano, Daniel A.; Nelson, Gerald

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Year Published: 1990

Reactions of grizzly bears, Ursus arctos horribilis, to wildfire in Yellowstone National Park, Wyoming

No abstract available.

Blanchard, B.M.; Knight, R.R.
Reactions of grizzly bears, Ursus arctos horribilis, to wildfire in Yellowstone National Park, Wyoming; 1990; Article; Journal; Canadian Field-Naturalist; Blanchard, B. M.; Knight, R. R.

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Year Published: 1988

Mortality patterns and population sinks for Yellowstone grizzly bears, 1973-1985

No abstract available.

Knight, R.R.; Blanchard, B.M.; Eberhardt, L.L.
Mortality patterns and population sinks for Yellowstone grizzly bears, 1973-1985; 1988; Article; Journal; Wildlife Society Bulletin; Knight, R. R.; Blanchard, B. M.; Eberhardt, L. L.