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: 1211
The reintroduction of black bears in Arkansas
Abstract is unavailable.
Authors
Kimberly G. Smith, Joseph D. Clark, Scott D. Shull
Multivariate model of female black bear habitat use for a Geographic Information System
Simple univariate statistical techniques may not adequately assess the multidimensional nature of habitats used by wildlife. Thus, we developed a multivariate method to model habitat-use potential using a set of female black bear (Ursus americanus) radio locations and habitat data consisting of forest cover type, elevation, slope, aspect, distance to roads, distance to streams, and forest cover ty
Authors
Joseph D. Clark, James E. Dunn, Kimberly G. Smith
Coupling of a lake model with a high resolution climate model for climate change studies
No abstract available.
Authors
Steven W. Hostetler, G. T. Bates, F. Giorgi
Cannibalism and predation on black bears by grizzly bears in the Yellowstone ecosystem, 1975-1990
We documented one instance of an adult male grizzly bear preying upon a black bear and four instances where circumstantial evidence suggested that grizzly bears (two cubs-of-the-year, one yearling female that was injured, and one adult male) had been preyed upon by conspecifics. We also examined feces of grizzly bears for bear remains. Remains of bears tended to be more common in spring feces and
Authors
D.J. Mattson, R. R. Knight, B.M. Blanchard
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 (Pinus albicaulis) seed crop. During years of large see
Authors
David J. Mattson, Bonnie M. Blanchard, Richard R. Knight
The track of the Yellowstone hot spot--volcanism, faulting and uplift
Abstract has not been submitted
Authors
K. L. Pierce, L. A. Morgan
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 based on the assumption that future habitats will c
Authors
David J. Mattson, Matthew M. Reid
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 assessed. Twenty‐year (1969–1989) records of summer strea
Authors
Steven W. Hostetler
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 range, while weaned males often made substantial movements
Authors
Bonnie M. Blanchard, Richard R. Knight
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 diffusion model is used to simulate evaporation for
Authors
Steven W. Hostetler, Patrick J Bartlein
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 human foods that have been established in former wi
Authors
David J. Mattson