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: 1334
Lessons from the fires of 2000: Post-fire heterogeneity in ponderosa pine forests Lessons from the fires of 2000: Post-fire heterogeneity in ponderosa pine forests
We evaluate burn-severity patterns for six burns that occurred in the southern Rocky Mountains and the Colorado Plateau in 2000. We compare the results of two data sources: Burned Area Rehabilitations Teams (BAER) and a spatial burnseverity model derived from satellite imagery (the Normalized Burn Ratio; NBR). BAER maps tended to overestimate area of severe burns and underestimate area...
Authors
Natasha B. Kotliar, Sandra L. Haire, Carl H. Key
Climate variability and change in high elevation regions: Past, present & future Climate variability and change in high elevation regions: Past, present & future
This special issue of Climatic Change contains a series of research and review articles, arising from papers that were presented and discussed at a workshop held in Davos, Switzerland on 25–28 June 2001. The workshop was titled ‘Climate Change at High Elevation Sites: Emerging Impacts’, and was convened to reprise an earlier conference on the same subject that was held in Wengen...
Authors
Henry F. Diaz, Martin Grosjean, Lisa J. Graumlich
Exploration and discovery in Yellowstone Lake: Results from high-resolution sonar imaging, seismic reflection profiling, and submersible studies Exploration and discovery in Yellowstone Lake: Results from high-resolution sonar imaging, seismic reflection profiling, and submersible studies
Discoveries from multi-beam sonar mapping and seismic reflection surveys of the northern, central, and West Thumb basins of Yellowstone Lake provide new insight into the extent of post-collapse volcanism and active hydrothermal processes occurring in a large lake environment above a large magma chamber. Yellowstone Lake has an irregular bottom covered with dozens of features directly...
Authors
L. A. Morgan, Wayne C. Shanks, D. A. Lovalvo, S. Y. Johnson, W. J. Stephenson, K. L. Pierce, S. S. Harlan, C. A. Finn, G. Lee, M. Webring, B. Schulze, J. Duhn, R. Sweeney, L. Balistrieri
Large carnivores response to recreational big game hunting along the Yellowstone National Park and Absaroka-Beartooth Wilderness boundary Large carnivores response to recreational big game hunting along the Yellowstone National Park and Absaroka-Beartooth Wilderness boundary
The Greater Yellowstone Ecosystem contains the rare combination of an intact guild of native large carnivores, their prey, and differing land management policies (National Park versus National Forest; no hunting versus hunting). Concurrent field studies on large carnivores allowed us to investigate activities of humans and carnivores on Yellowstone National Park's (YNP) northern boundary...
Authors
T.E. Ruth, D.W. Smith, M.A. Haroldson, P.C. Buotte, C.C. Schwartz, H.B. Quigley, S. Cherry, D. Tyres, K. Frey
Mapping vegetation in Yellowstone National Park using spectral feature analysis of AVIRIS data Mapping vegetation in Yellowstone National Park using spectral feature analysis of AVIRIS data
Knowledge of the distribution of vegetation on the landscape can be used to investigate ecosystem functioning. The sizes and movements of animal populations can be linked to resources provided by different plant species. This paper demonstrates the application of imaging spectroscopy to the study of vegetation in Yellowstone National Park (Yellowstone) using spectral feature analysis of...
Authors
Raymond F. Kokaly, Don G. Despain, Roger N. Clark, K. Eric Livo
Hatching success in salamanders and chorus frogs at two sites in Colorado, USA: Effects of acidic deposition and climate Hatching success in salamanders and chorus frogs at two sites in Colorado, USA: Effects of acidic deposition and climate
The snowpack in the vicinity of the Mount Zirkel Wilderness Area is among the most acidic in the western United States. We analyzed water chemistry and examined hatching success in tiger salamanders and chorus frogs at ponds there and at nearby Rabbit Ears Pass (Dumont) to determine whether acid deposition affects amphibians or their breeding habitats at these potentially sensitive...
Authors
E. Muths, K. Campbell, P.S. Corn
Modeling means in latent variable models of natural selection Modeling means in latent variable models of natural selection
No abstract available.
Authors
Bruce H. Pugesek
Endangered toads in the Rockies Endangered toads in the Rockies
The western toad species complex, endemic to western North America, includes two montane species that have undergone extensive declines. These are the Yosemite toad, Bufo canorus, in the Sierra Nevada, and the southern Rocky Mountain populations of the boreal toad, B. borea. Most declines in the Rockies appear to have occurred before 1980, but a recent episode in Rocky Mountain National...
Authors
Paul Stephen Corn
Large wood recruitment and redistribution in headwater streams in the southern Oregon Coast Range, U.S.A Large wood recruitment and redistribution in headwater streams in the southern Oregon Coast Range, U.S.A
Large wood recruitment and redistribution mechanisms were investigated in a 3.9 km2 basin with an old-growth Pseudotsuga menziesii (Mirb.) Franco and Tsuga heterophylla (Raf.) Sarg. forest, located in the southern Coast Range of Oregon. Stream size and topographic setting strongly influenced processes that delivered wood to the channel network. In small colluvial channels draining steep...
Authors
Christine L. May, Robert E. Gresswell
Spread of hybridization between native westslope cutthroat trout, Oncorhynchus clarki lewisi, and nonnative rainbow trout, Oncorhynchus mykiss Spread of hybridization between native westslope cutthroat trout, Oncorhynchus clarki lewisi, and nonnative rainbow trout, Oncorhynchus mykiss
We examined spatial and temporal patterns of hybridization between native westslope cutthroat trout, Oncorhynchus clarki lewisi, and nonnative rainbow trout, O. mykiss, in streams of the Flathead River system in Montana, U.S.A. We detected hybridization in 24 of 42 sites sampled from 1998 to 2001. We found new Oncorhynchus mykiss introgression in seven of 11 sample populations that were...
Authors
Nathaniel P. Hitt, Christopher A. Frissell, Clint C. Muhlfeld, Fred W. Allendorf
Ecological implications of bovine tuberculosis in African Buffalo herds Ecological implications of bovine tuberculosis in African Buffalo herds
Following the recent invasion of bovine tuberculosis (BTB) into the Kruger National Park, South Africa, we conducted a study on the maintenance host, African buffalo, to investigate associations between BTB prevalence and calf:cow ratio, age structure, body condition, and endoparasite load. Statistical analyses compared herds of zero, medium (1–40%), and high (>40%) BTB prevalence. To...
Authors
Alex Caron, Paul C. Cross, Johan T. du Toit
Winter diel habitat use and movement by subadult bull trout in the upper Flathead River, Montana Winter diel habitat use and movement by subadult bull trout in the upper Flathead River, Montana
We evaluated the diel habitat use and movement of subadult bull trout Salvelinus confluentus by use of radiotelemetry during winter in the upper Flathead River, Montana. Of the 13 monitored bull trout, 12 (92%) made at least one diel movement to other habitat locations during their respective day–night tracking surveys and moved an average of 73% of the time. The median distance moved...
Authors
Clint C. Muhlfeld, Steve Glutting, Rick Hunt, Durae Daniels, Brian Marotz