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 Upper Midwest Aerospace Consortium Environmental Information Network: Building ‘Learning Communities’ in the Northern Great Plains
In the last two decades alone, the U.S. and large portions of the world have witnessed what can be aptly be described as an explosion of scientific information and technological innovations that has permeated almost every aspect of our lives. Given these trends, it is clear that science and the understanding of science are becoming increasingly more relevant and essential to decision-makers and th
Authors
Leigh Welling, George Seielstad, Pat McClurg, Daniel B. Fagre
Role of brown bears (Ursus arctos) in the flow of marine nitrogen into a terrestrial ecosystem
We quantified the amount, spatial distribution, and importance of salmon (Oncorhynchus spp.)-derived nitrogen (N) by brown bears (Ursus arctos) on the Kenai Peninsula, Alaska. We tested and confirmed the hypothesis that the stable isotope signature (δ15N) of N in foliage of white spruce (Picea glauca) was inversely proportional to the distance from salmon-spawning streams (r=–0.99 and P<0.05 in tw
Authors
Grant V. Hilderbrand, Thomas A. Hanley, Charles T. Robbins, C.C. Schwartz
Effects of sample size and sampling frequency on studies of brown bear home ranges and habitat use
We equipped 9 brown bears (Ursus arctos) on the Kenai Peninsula, Alaska, with collars containing both conventional very-high-frequency (VHF) transmitters and global positioning system (GPS) receivers programmed to determine an animal's position at 5.75-hr intervals. We calculated minimum convex polygon (MCP) and fixed and adaptive kernel home ranges for randomly-selected subsets of the GPS data to
Authors
Steve M. Arthur, Charles C. Schwartz
Effect of seasonal differences in dietary meat intake on changes in body mass and composition in wild and captive brown bears
The influence of seasonal dietary meat intake on changes in body mass and composition in wild and captive brown bears (Ursus arctos) was investigated because the importance and availability of meat to brown bear populations is currently an important management consideration in several North American ecosystems. Adult female brown bears on the Kenai Peninsula, Alaska, utilized meat heavily in both
Authors
Grant V. Hilderbrand, S.G. Jenkins, C.C. Schwartz, Thomas A. Hanley, C.T. Robbins
Radio-tracking large wilderness mammals: integration of GPS and Argos technologies
We tested 30 prototype global positioning system (GPS) radiocollars on brown bears (Ursus arctos) over a 3-year period on the Kenai Peninsula, Alaska. Collars were of 2 design types: GPS units with an Argos (Argos Data collection and Location System) satellite uplink (n = 19) and GPS units where the data were stored on board (n = 10) for retrieval at a later date. All units also contained a conven
Authors
Charles C. Schwartz, Steve M. Arthur
Fire, red squirrels, whitebark pine, and Yellowstone grizzly bears
Whitebark pine (Pinus albicaulis) habitats are important to Yellowstone grizzly bears (Ursus arctos) as refugia and sources of food. Ecological relationships between whitebark pine, red squirrels (Tamiasciurus hudsonicus), and grizzly bear use of pine seeds on Mt. Washburn in Yellowstone National Park, Wyoming, were examined during 1984-86. Following large-scale fires in 1988, we repeated the stud
Authors
Shannon Podruzny, Daniel P. Reinhart, David J. Mattson
Simulation of the potential responses of regional climate and surface processes in western North America to a canonical Heinrich event
No abstract available.
Authors
S. W. Hostetler, P. J. Bartlein
Radiotracking large wilderness mammals: Integration of GPS and Argos technology
We tested 30 prototype global positioning system (GPS) radiocollars on brown bears (Ursus arctos) over a 3-year period on the Kenai Peninsula, Alaska. Collars were of 2 design types: GPS with an Argos (Argos Data collection and Location System) satellite uplink (n=19) and GPS unites where the data were stored on board (n=10) for retrieval at a later date. All units also contained a conventional VH
Authors
Charles C. Schwartz, Steve M. Arthur
Predicting mountain lion activity using radiocollars equipped with mercury tip-sensors
Radiotelemetry collars with tip-sensors have long been used to monitor wildlife activity. However, comparatively few researchers have tested the reliability of the technique on the species being studied. To evaluate the efficacy of using tip-sensors to assess mountain lion (Puma concolor) activity, we radiocollared 2 hand-reared mountain lions and simultaneously recorded their behavior and the ass
Authors
Michael W. Janis, Joseph D. Clark, Craig Johnson
Species - and community- level responses to disturbance imposed by feral horse grazing and other management practices
No abstract available.
Authors
Erik A. Beever, Peter F. Advised by Brussard