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: 1216
Performance of spread spectrum Global Positioning System collars on grizzly and black bears
Global Positioning System (GPS) telemetry is a prevalent tool now used in the study of large mammals. Global Positioning Systems either store the data on board the collar or contain a remote-transfer system that allows for data recovery at more frequent intervals. Spread spectrum (S–S) technology is a new mode of data transfer designed to overcome interference problems associated with narrow-band
Authors
Charles C. Schwartz, Shannon Podruzny, Steven L. Cain, Steve Cherry
The Track of the Yellowstone Hotspot: Multi-disciplinary Perspectives on the Origin of the Yellowstone-Snake River Plain Volcanic Province
No abstract available.
Authors
Lisa Ann Morgan Morzel, H. Cathey, Kenneth L. Pierce
Comment: Radiocarbon deglaciation chronology of the Thunder Bay, Ontario area and implications for ice sheet retreat patterns
No abstract available.
Authors
Anders E. Carlson, Peter U. Clark, Steven W. Hostetler
Aspects and implications of bear reintroduction: Chapter 6
Bear reintroduction has been practiced worldwide with varying degrees of success. Homing is a significant issue for American black bears, Ursus americanus, and winter-release techniques of females with cubs have been successfully used to improve settling rates and survival. Reintroduction success for all bear species appears to be positively correlated with translocation distance, and success is
Authors
Joseph D. Clark
Mammals of the Smokies
Guide to the most popular and famous critters in the Great Smoky Mountains National Park. Includes bear, elk, deer, flying squirrels, and buffalo.
Authors
Edward Pivorun, M. J. Harvey, F.T. Van Manen, M.R. Pelton, J. D. Clark, E. Kim Delozier, B. Stiver
Demography and genetic structure of a recovering grizzly bear population
Grizzly bears (brown bears; Ursus arctos) are imperiled in the southern extent of their range worldwide. The threatened population in northwestern Montana, USA, has been managed for recovery since 1975; yet, no rigorous data were available to monitor program success. We used data from a large noninvasive genetic sampling effort conducted in 2004 and 33 years of physical captures to assess abundanc
Authors
K.C. Kendall, J.B. Stetz, J. Boulanger, A.C. Macleod, David Paetkau, Gary C. White
Distribution limits of Batrachochytrium dendrobatidis: a case study in the Rocky Mountains, USA
Knowledge of the environmental constraints on a pathogen is critical to predicting its dynamics and effects on populations. Batrachochytrium dendrobatidis (Bd), an aquatic fungus that has been linked with widespread amphibian declines, is ubiquitous in the Rocky Mountains. As part of assessing the distribution limits of Bd in our study area, we sampled the water column and sediments for Bd zoospor
Authors
Blake R. Hossack, Erin L. Muths, Chauncey W. Anderson, Julie D. Kirshtein, P. Stephen Corn
Demographics of an experimentally released population of elk in Great Smoky Mountains National Park
We assessed the potential for reestablishing elk (Cervus elaphus) in Great Smoky Mountains National Park (GSMNP), USA, by estimating vital rates of experimentally released animals from 2001 to 2006. Annual survival rates for calves ranged from 0.333 to 1.0 and averaged 0.592. Annual survival for subadult and adult elk (i.e., ≥1 yr of age) ranged from 0.690 to 0.933, depending on age and sex. We us
Authors
Jennifer L. Murrow, Joseph D. Clark, E. Kim Delozier
Is the track of the Yellowstone hotspot driven by a deep mantle plume? - Review of volcanism, faulting, and uplift in light of new data
Geophysical imaging of a tilted mantle plume extending at least 500 km beneath the Yellowstone caldera provides compelling support for a plume origin of the entire Yellowstone hotspot track back to its inception at 17 Ma with eruptions of flood basalts and rhyolite. The widespread volcanism, combined with a large volume of buoyant asthenosphere, supports a plume head as an initial phase. Estimates
Authors
Kenneth L. Pierce, Lisa A. Morgan
Mass balance of a cirque glacier in the U.S. Rocky Mountains
Glacier National Park, Montana, USA, contains 27 cirque glaciers, most less than 1 km2 and together comprising about 17 km2. These glaciers lie at relatively low elevation (2000 – 3000 m a.s.l.) and latitude (48o N) and have undergone dramatic retreat since the mid-nineteenth century, when an estimated 150 glaciers existed. Continuing volume losses and the disappearance of glaciers in recent decad
Authors
Blase A. Reardon, J. T. Harper, Daniel B. Fagre
Low genotyping error rates and noninvasive sampling in Bighorn Sheep
Noninvasive DNA sampling allows studies of natural populations without disturbing the target animals. Unfortunately, high genotyping error rates often make noninvasive studies difficult. We report low error rates (0.0–7.5%/locus) when genotyping 18 microsatellite loci in only 4 multiplex polymerase chain reaction amplifications using fecal DNA from bighorn sheep (Ovis canadensis). The average locu
Authors
Gordon Luikart, Stephanie Zundel, Delphine Rioux, Christian Miquel, Kim A. Keating, John T. Hogg, Brian Steele, Kerry Foresman, Pierre Taberlet
Grizzly bear density in Glacier National Park, Montana
We present the first rigorous estimate of grizzly bear (Ursus arctos) population density and distribution in and around Glacier National Park (GNP), Montana, USA. We used genetic analysis to identify individual bears from hair samples collected via 2 concurrent sampling methods: 1) systematically distributed, baited, barbed-wire hair traps and 2) unbaited bear rub trees found along trails. We used
Authors
K.C. Kendall, J.B. Stetz, David A. Roon, L.P. Waits, J.B. Boulanger, David Paetkau