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: 1197
Contexts for change in alpine tundra
Because alpine tundra is responding to climate change, a need exists to understand the meaning of observed changes. To provide context for such interpretation, the relevance of niche and neutral theories of biogeography and the continuum and classification approaches to biogeographic description are assessed. Two extensive studies of alpine tundra, from the Indian Peaks area, Colorado and Glacier
Authors
George P. Malanson, Jonathan P. Rose, P. Jason Schroeder, Daniel B. Fagre
New collection records and range extension for the caddisfly Arctopora salmon (Smith, 1969) (Trichoptera: Limnephilidae)
[No abstract available]
Authors
Blake R. Hossack, Robert L. Newell, David E. Ruiter
Avalanche ecology and large magnitude avalanche events: Glacier National Park, Montana, USA
Large magnitude snow avalanches play an important role ecologically in terms of wildlife habitat, vegetation diversity, and sediment transport within a watershed. Ecological effects from these infrequent avalanches can last for decades. Understanding the frequency of such large magnitude avalanches is also critical to avalanche forecasting for the Going-to-the-Sun Road (GTSR). In January 2009, a l
Authors
Daniel B. Fagre, Erich H. Peitzsch
The potential influence of changing climate on the persistence of salmonids of the inland west
The Earth's climate warmed steadily during the 20th century, and mean annual air temperatures are estimated to have increased by 0.6°C (Intergovernmental Panel on Climate Change, 2007). Although many cycles of warming and cooling have occurred in the past, the most recent warming period is unique in its rate and magnitude of change (Siegenthaler and others, 2005) and in its association with anthro
Authors
A.L. Haak, J.E. Williams, D. Isaak, A. Todd, C.C. Muhlfeld, J. L. Kershner, R. E. Gresswell, S. W. Hostetler, H.M. Neville
Founding population size of an aquatic invasive species
Non-native species of fish threaten native fishes throughout North America, and in the Rocky Mountains, introduced populations of lake trout threaten native populations of bull trout. Effective management of lake trout and other exotic species require understanding the dynamics of invasion in order to either suppress non-native populations or to prevent their spread. In this study, we used microsa
Authors
Steven T. Kalinowski, Clint C. Muhlfeld, Christopher S. Guy, Benjamin Cox
Bison conservation initiative: Bison conservation genetics workshop: Report and recommendations
One of the first outcomes of the Department of the Interior (DOI) Bison Conservation Initiative was the Bison Conservation Genetics Workshop held in Nebraska in September 2008. The workshop brought together scientists from government agencies and non-governmental organizations with professional population geneticists to develop guidance for the genetic management of the federal bison herds. The sc
Authors
Peter J. Gogan, Peter Dratch
Noninvasive methods for monitoring bear population trends
The U.S. Geological Survey began a grizzly bear research project in 2009 in the Northern Continental Divide Ecosystem (NCDE) of northwestern Montana. This work uses hair collection and DNA analysis methods similar to those used in the 2004 Northern Divide Grizzly Bear Project. However, instead of producing a snapshot of population size, the objectives of this new work are to estimate population gr
Authors
Katherine Kendall
Hazards affecting grizzly bear survival in the Greater Yellowstone Ecosystem
During the past 2 decades, the grizzly bear (Ursus arctos) population in the Greater Yellowstone Ecosystem (GYE) has increased in numbers and expanded its range. Early efforts to model grizzly bear mortality were principally focused within the United States Fish and Wildlife Service Grizzly Bear Recovery Zone, which currently represents only about 61% of known bear distribution in the GYE. A more
Authors
Charles C. Schwartz, Mark A. Haroldson, Gary C. White
Current status of brown bears in the Manasalu Conservation Area, Nepal
Although brown bears (Ursus arctos) are rare in the Himalayan region, populations have been documented in alpine habitats of Pakistan and India. Brown bears were once known to exist in both Nepal and Bhutan, but current information on their numbers and distributions was lacking. We document the presence of brown bears in the Manasalu Conservation Area (MCA) in Nepal using field surveys and intervi
Authors
Achyut Aryal, S. Sathyakumar, Charles C. Schwartz
Ecological responses to contemporary climate change within species, communities, and ecosystems
No abstract available.
Authors
Jerrold L. Belant, Erik A. Beever, John E. Gross, Joshua J. Lawler
Genetic analysis of individual origins supports isolation of grizzly bears in the Greater Yellowstone Ecosystem
The Greater Yellowstone Ecosystem (GYE) supports the southernmost of the 2 largest remaining grizzly bear (Ursus arctos) populations in the contiguous United States. Since the mid-1980s, this population has increased in numbers and expanded in range. However, concerns for its long-term genetic health remain because of its presumed continued isolation. To test the power of genetic methods for detec
Authors
Mark A. Haroldson, Charles Schwartz, Katherine C. Kendall, Kerry A. Gunther, David S. Moody, Kevin L. Frey, David Paetkau
Brucellosis in cattle, bison, and elk: Management conflicts in a society with diverse values
No abstract available.
Authors
P.C. Cross, Michael R. Ebinger, V. Patrek, Rick Wallen