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: 1316
Natural glide slab avalanches, Glacier National Park, USA: A unique hazard and forecasting challenge Natural glide slab avalanches, Glacier National Park, USA: A unique hazard and forecasting challenge
In a museum of avalanche phenomena, glide cracks and glide avalanches might be housed in the “strange but true” section. These oddities are uncommon in most snow climates and tend to be isolated to specific terrain features such as bedrock slabs. Many glide cracks never result in avalanches, and when they do, the wide range of time between crack formation and slab failure makes them...
Authors
Blase Reardon, Daniel B. Fagre, Mark Dundas, Chris Lundy
Observer error structure in bull trout redd counts in Montana streams: Implications for inference on true redd numbers Observer error structure in bull trout redd counts in Montana streams: Implications for inference on true redd numbers
Despite the widespread use of redd counts to monitor trends in salmonid populations, few studies have evaluated the uncertainties in observed counts. We assessed the variability in redd counts for migratory bull trout Salvelinus confluentus among experienced observers in Lion and Goat creeks, which are tributaries to the Swan River, Montana. We documented substantially lower observer...
Authors
Clint C. Muhlfeld, Mark L. Taper, David F. Staples, Bradley B. Shepard
Spatial heterogeneity influences native and nonnative plant species richness Spatial heterogeneity influences native and nonnative plant species richness
No abstract available.
Authors
S. Kumar, T.J. Stohlgren, G.W. Chong
Survival and growth of age-0 steelhead after surgical implantation of 23-mm passive integrated transponders Survival and growth of age-0 steelhead after surgical implantation of 23-mm passive integrated transponders
Little information is available on the effects of implanting 23-mm passive integrated transponder (PIT) tags in salmonids less than 90 mm fork length (FL). Using juvenile steelhead Oncorhynchus mykiss (range, 73–97 mm FL), we compared instantaneous growth rates and survival among three experimental groups: control, surgery with no tag, and surgery with tag. Survival rate was lower for...
Authors
D.S. Bateman, R. E. Gresswell
Wildlife tuberculosis in South African conservation areas: Implications and challenges Wildlife tuberculosis in South African conservation areas: Implications and challenges
Tuberculosis, caused by Mycobacterium bovis, was first diagnosed in African buffalo in South Africa's Kruger National Park in 1990. Over the past 15 years the disease has spread northwards leaving only the most northern buffalo herds unaffected. Evidence suggests that 10 other small and large mammalian species, including large predators, are spillover hosts. Wildlife tuberculosis has...
Authors
A.L. Michel, Roy G. Bengis, D.F. Keet, M. Hofmeyr, L. M. De Klerk, P.C. Cross, Anna E. Jolles, D. Cooper, I.J. Whyte, P. Buss, J. Godfroid
Landscape Assessment: Ground measure of severity, the Composite Burn Index; and Remote sensing of severity, the Normalized Burn Ratio Landscape Assessment: Ground measure of severity, the Composite Burn Index; and Remote sensing of severity, the Normalized Burn Ratio
Abstract has not been submitted
Authors
C.H. Key, N.C. Benson
Taxonomic considerations in listing subspecies under the U.S. Endangered Species Act Taxonomic considerations in listing subspecies under the U.S. Endangered Species Act
The U.S. Endangered Species Act (ESA) allows listing of subspecies and other groupings below the rank of species. This provides the U.S. Fish and Wildlife Service and the National Marine Fisheries Service with a means to target the most critical unit in need of conservation. Although roughly one-quarter of listed taxa are subspecies, these management agencies are hindered by...
Authors
S. M. Haig, E.A. Beever, Steven M. Chambers, Hope M. Draheim, Bruce D. Dugger, Susie Dunham, Elise Elliott-Smith, Joseph B. Fontaine, Dylan C. Kesler, Brian J. Knaus, Iara F. Lopes, Peter J. Loschl, Thomas D. Mullins, Lisa M. Sheffield
Grizzly bear nutrition and ecology studies in Yellowstone National Park Grizzly bear nutrition and ecology studies in Yellowstone National Park
T HE CHANCE TO SEE a wild grizzly bear is often the first or second reason people give for visiting Yellow - stone National Park. Public interest in bears is closely coupled with a desire to perpetuate this wild symbol of the American West. Grizzly bears have long been described as a wilderness species requiring large tracts of undisturbed habitat. However, in today’s world, most grizzly...
Authors
Charles T. Robbins, Charles C. Schwartz, Kerry A. Gunther, Christopher Servheen
Assessing vaccination as a control strategy in an ongoing epidemic: Bovine tuberculosis in African buffalo Assessing vaccination as a control strategy in an ongoing epidemic: Bovine tuberculosis in African buffalo
Bovine tuberculosis (BTB) is an exotic disease invading the buffalo population (Syncerus caffer) of the Kruger National Park (KNP), South Africa. We used a sex and age-structured epidemiological model to assess the effectiveness of a vaccination program and define important research directions. The model allows for dispersal between a focal herd and background population and was...
Authors
Paul C. Cross, Wayne M. Getz
Habitat-based adaptive management at Mount Haggin Wildlife Management Area Habitat-based adaptive management at Mount Haggin Wildlife Management Area
The 22,743-hectare Mount Haggin Wildlife Management Area was purchased in 1976, in part for moose (Alces alces) winter range. Observed moose populations climbed from a low of 7 in 1976 to a high of 56 in 2000. A 4-step management program was initiated in 2000 consisting of definition of management objective, monitoring to determine if the objective was attained, developing a management...
Authors
R.B. Keigley, C.W. Fager
A spatially explicit approach for evaluating relationships among coastal cutthroat trout, habitat, and disturbance in small Oregon streams A spatially explicit approach for evaluating relationships among coastal cutthroat trout, habitat, and disturbance in small Oregon streams
Abstract has not been submitted
Authors
R. E. Gresswell, C.E. Torgersen, D.S. Bateman, T.J. Guy, S.R. Hendricks, J. E. B. Wofford
Juvenile salmonid use of freshwater emergent wetlands in the floodplain and its implications for conservation management Juvenile salmonid use of freshwater emergent wetlands in the floodplain and its implications for conservation management
A recent trend of enhancing freshwater emergent wetlands for waterfowl and other wildlife has raised concern about the effects of such measures on juvenile salmonids. We undertook this study to quantify the degree and extent of juvenile Pacific salmon Oncorhynchus spp. utilization of enhanced and unenhanced emergent wetlands within the floodplain of the lower Chehalis River, Washington...
Authors
Julie A. Henning, Robert E. Gresswell, Ian A. Fleming