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
Phylogeography of mitochondrial DNA variation in brown bears and polar bears Phylogeography of mitochondrial DNA variation in brown bears and polar bears
We analyzed 286 nucleotides of the middle portion of the mitochondrial cytochrome b gene of 61 brown bears from three locations in Alaska and 55 polar bears from Arctic Canada and Arctic Siberia to test our earlier observations of paraphyly between polar bears and brown bears as well as to test the extreme uniqueness of mitochondrial DNA types of brown bears on Admiralty, Baranof, and...
Authors
Gerald Shields, Deborah Adams, Gerald Garner, Martine Labelle, Jacy Pietsch, Malcolm Ramsay, Charles Schwartz, Kimberly Titus, Scott Williamson
The Upper Midwest Aerospace Consortium Environmental Information Network: Building ‘Learning Communities’ in the Northern Great Plains 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...
Authors
Leigh Welling, George Seielstad, Pat McClurg, Daniel Fagre
Yellowstone plume head: Postulated tectonic relations to the Vancouver Slab, continental boundaries, and climate Yellowstone plume head: Postulated tectonic relations to the Vancouver Slab, continental boundaries, and climate
No abstract available.
Authors
Kenneth Pierce, Lisa Morgan, Richard Saltus
Obsidian hydration dating of Quaternary events Obsidian hydration dating of Quaternary events
Abstract has not been submitted
Authors
K. Pierce, Irving Friedman
Role of brown bears (Ursus arctos) in the flow of marine nitrogen into a terrestrial ecosystem 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
Authors
Grant V. Hilderbrand, Thomas Hanley, Charles Robbins, C.C. Schwartz
Effects of sample size and sampling frequency on studies of brown bear home ranges and habitat use 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...
Authors
Steve Arthur, Charles Schwartz
Effect of seasonal differences in dietary meat intake on changes in body mass and composition in wild and captive brown bears 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...
Authors
Grant V. Hilderbrand, S.G. Jenkins, C.C. Schwartz, Thomas Hanley, C.T. Robbins
Radio-tracking large wilderness mammals: integration of GPS and Argos technologies 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...
Authors
Charles Schwartz, Steve Arthur
Yellowstone bears Yellowstone bears
No abstract available.
Authors
R.R. Knight, B.M. Blanchard, P. Schullery
Fire, red squirrels, whitebark pine, and Yellowstone grizzly bears 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...
Authors
Shannon Podruzny, Daniel Reinhart, David Mattson
Simulation of the potential responses of regional climate and surface processes in western North America to a canonical Heinrich event 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. Hostetler, P. J. Bartlein
Radiotracking large wilderness mammals: Integration of GPS and Argos technology 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...
Authors
Charles Schwartz, Steve Arthur