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: 1296
Human impacts on bear habitat use 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...
Authors
David Mattson
Bear use of cutthroat trout spawning streams in Yellowstone National Park 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 enumerate spawner density and levels of...
Authors
Daniel Reinhart, D.J. Mattson
Predatory behavior of grizzly bears feeding on elk calves in Yellowstone National Park 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 chasing although some bears used a variety of...
Authors
Steven French, Marilynn French
Fluctuating asymmetry and testing isolation of Montana grizzly bear populations 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. Evidence for precipitaiton effects is also...
Authors
Harold Picton, Daniel Palmisciano, Gerald Nelson
Reactions of grizzly bears, Ursus arctos horribilis, to wildfire in Yellowstone National Park, Wyoming Reactions of grizzly bears, Ursus arctos horribilis, to wildfire in Yellowstone National Park, Wyoming
No abstract available.
Authors
B.M. Blanchard, R.R. Knight
Mortality patterns and population sinks for Yellowstone grizzly bears, 1973-1985 Mortality patterns and population sinks for Yellowstone grizzly bears, 1973-1985
No abstract available.
Authors
R.R. Knight, B.M. Blanchard, L.L. Eberhardt
Status and management of interior stocks of cutthroat trout Status and management of interior stocks of cutthroat trout
Abstract has not been submitted
Authors
R. E. Gresswell
Arkansas black bear hunter survey Arkansas black bear hunter survey
Questionnaires were mailed to black bear (Ursus americanus) hunters in Arkansas following the 1980-84 bear seasons to determine participation, hunter success, and number of bears observed by hunters. Man-days of hunting to harvest a bear ranged from 148 to 671 and hunter success ranged from 0.4% to 2.2%. With the exception of 1980, number of permits issued, man-days of bear hunting, and...
Authors
Larry Pharris, Joseph Clark
Glacial sequence near McCall, Idaho: Weathering rinds, soil development, morphology, and other relative-age criteria Glacial sequence near McCall, Idaho: Weathering rinds, soil development, morphology, and other relative-age criteria
The sequence of glacial deposits near McCall, Idaho, previously assigned to the Pinedale and Bull Lake glaciations, contains deposits of four different ages. These ages are defined by multiple relative-age criteria, including weathering rinds, soil development, surface-rock weathering, morainal morphology, and loess stratigraphy. The thickness of weathering rinds on basaltic clasts is...
Authors
S.M. Colman, Kenneth Pierce
Population dynamics of Yellowstone grizzly bears Population dynamics of Yellowstone grizzly bears
Data on the population of grizzly bears in the environs of Yellowstone National Park suggest that the population has not recovered from the reductions following closure of garbage dumps in 1970 and 1971, and may continue to decline. A computer simulation model indicates that the risk of extirpation over the next 30 yr is small, if the present population parameters continue to prevail. A...
Authors
Richard Knight, L.L. Eberhardt
Late Wisconsin mountain glaciation in the western United States Late Wisconsin mountain glaciation in the western United States
No abstract available.
Authors
S.C. Porter, Kenneth Pierce, T. Hamilton