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: 1211
Spatial population structure of Yellowstone bison
Increases in Yellowstone National Park, USA, bison (Bison bison) numbers and shifts in seasonal distribution have resulted in more frequent movements of bison beyond park boundaries and development of an interagency management plan for the Yellowstone bison population. Implementation of the plan under the adaptive management paradigm requires an understanding of the spatial and temporal structure
Authors
Edward M. Olexa, Peter J. Gogan
Identifying sites for elk restoration in Arkansas
We used spatial data to identify potential areas for elk (Cervus elaphus) restoration in Arkansas. To assess habitat, we used locations of 239 elk groups collected from helicopter surveys in the Buffalo National River area of northwestern Arkansas, USA, from 1992 to 2002. We calculated the Mahalanobis distance (D2) statistic based on the relationship between those elk-group locations and a suite o
Authors
R.L. Telesco, F.T. Van Manen, J. D. Clark, Michael E. Cartwright
Alpine ecosystem dynamics and change: A view from the heights
No abstract available.
Authors
G.P. Malanson, D.R. Butler, Daniel B. Fagre
Modeling and monitoring biophysical dynamics and change
No abstract available.
Authors
Daniel B. Fagre
Response of western mountain ecosystems to climatic variability and change: The Western Mountain Initiative
Mountain ecosystems within our national parks and other protected areas provide valuable goods and services such as clean water, biodiversity conservation, and recreational opportunities, but their potential responses to expected climatic changes are inadequately understood. The Western Mountain Initiative (WMI) is a collaboration of scientists whose research focuses on understanding and predictin
Authors
Nathan L. Stephenson, David A. Peterson, Daniel B. Fagre, Craig D. Allen, Donald McKenzie, Jill Baron, K. O'Brien
Uncertainty management, spatial and temporal reasoning, and validation of intelligent environmental decision support systems
There are inherent open problems arising when developing and running Intelligent Environmental
Decision Support Systems (IEDSS). During daily operation of IEDSS several open challenge problems
appear. The uncertainty of data being processed is intrinsic to the environmental system, which is being
monitored by several on-line sensors and off-line data. Thus, anomalous data values at data gatheri
Authors
Miquel Sànchez-Marrè, Karina Gilbert, Rick S. Sojda, Jean Philippe Steyer, Peter Struss, Ignasi Rodríguez-Roda
Ecological and sampling constraints on defining landscape fire severity
Ecological definition and detection of fire severity are influenced by factors of spatial resolution and timing. Resolution determines the aggregation of effects within a sampling unit or pixel (alpha variation), hence limiting the discernible ecological responses, and controlling the spatial patchiness of responses distributed throughout a burn (beta variation). As resolution decreases, alpha var
Authors
C.H. Key
Grizzly bear management in Yellowstone National Park: The heart of recovery in the Yellowstone Ecosystem
Grizzly bear (Ursus arctos) management in the Greater Yellowstone Ecosystem (GYE) in the past quarter century has resulted in more than doubling of the population from around 200 to more than 500, expansion of range back into habitats where the bear has extirpated more than a century ago, and a move toward removal from the U.S. Endangered Species list. At the center of this success story are the m
Authors
C.C. Schwartz, K. Gunther
Temporal, spatial, and environmental influences on the demographics of grizzly bears 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 in range. Understanding temporal, environmental, and spatial variables responsible for this change is useful in evaluating what likely influenced grizzly bear demographics in the GYE and where future management efforts might benefit conservation and
Authors
Charles C. Schwartz, Mark A. Haroldson, Gary C. White, Richard B. Harris, Steve Cherry, Kim A. Keating, Dave Moody, Christopher Servheen
Identifying suitable sites for Florida panther reintroduction
A major objective of the 1995 Florida Panther (Puma concolor cory) Recovery Plan is the establishment of 2 additional panther populations within the historic range. Our goal was to identify prospective sites for Florida panther reintroduction within the historic range based on quantitative landscape assessments. First, we delineated 86 panther home ranges using telemetry data collected from 1981 t
Authors
Cindy A. Thatcher, Frank T. van Manen, Joseph D. Clark
Growth and sustainability of black bears at White River National Wildlife Refuge, Arkansas
The black bear (Ursus americanus) population at White River National Wildlife Refuge is isolated and genetically distinct, but hunting occurs adjacent to refuge boundaries and females with cubs are removed annually for a reintroduction project. We trapped and radiotracked bears to determine level of exploitation and compare methods for estimating population growth and sustainability. We captured 2
Authors
Joseph D. Clark, R. Eastridge