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
Conservation endocrinology: A noninvasive tool to understand relationships between carnivore colonization and ecological carrying capacity Conservation endocrinology: A noninvasive tool to understand relationships between carnivore colonization and ecological carrying capacity
Reproductive technology, especially the diagnosis of pregnancy by radioimmunoassay of fecal steroid metabolites, is an important component of captive propagation, but its role in our understanding of ecological interactions and in situ biological restoration has been more limited. Where large herbivores have been 'released' from predation by the extirpation of carnivores, controversy...
Authors
J. Berger, J.W. Testa, T. Roffe, S.L. Monfort
Estimating the effectiveness of further sampling inspecies inventories Estimating the effectiveness of further sampling inspecies inventories
Estimators of the number of additional species expected in the next Δn samples offer a potentially important tool for improving cost-effectiveness of species inventories but are largely untested. We used Monte Carlo methods to compare 11 such estimators, across a range of community structures and sampling regimes, and validated our results, where possible, using empirical data from...
Authors
Kim A. Keating, James F. Quinn, M.A. Ivie, L.L. Ivie
Assessing simulated ecosystem processes for climate variability research at Glacier National Park, USA Assessing simulated ecosystem processes for climate variability research at Glacier National Park, USA
Glacier National Park served as a test site for ecosystem analyses that involved a suite of integrated models embedded within a geographic information system. The goal of the exercise was to provide managers with maps that could illustrate probable shifts in vegetation, net primary production (NPP), and hydrologic responses associated with two selected climatic scenarios. The climatic...
Authors
Joseph D. White, Steven W. Running, Peter E. Thornton, Robert E. Keane, Kevin C. Ryan, Daniel B. Fagre, Carl H. Key
A female black bear denning habitat model using a geographic information system A female black bear denning habitat model using a geographic information system
We used the Mahalanobis distance statistic and a raster geographic information system (GIS) to model potential black bear (Ursus americanus) denning habitat in the Ouachita Mountains of Arkansas. The Mahalanobis distance statistic was used to represent the standard squared distance between sample variates in the GIS database (forest cover type, elevation, slope, aspect, distance to...
Authors
J. D. Clark, S.G. Hayes, J.M. Pledger
Species repatriation: Red wolf Species repatriation: Red wolf
No abstract available.
Authors
C. F. Lucash, B. A. Crawford, J. D. Clark
Management of a large carnivore: Black bear Management of a large carnivore: Black bear
No abstract available.
Authors
Joseph D. Clark, Michael R. Pelton
Browse Evaluation by Analysis of Growth Form Browse Evaluation by Analysis of Growth Form
Abstract has not been submitted
Authors
R.B. Keigley, M.R. Frisina
Estimating species richness: The Michaelis-Menten model revisited Estimating species richness: The Michaelis-Menten model revisited
The Michaelis-Menten model has been widely used to estimate the richness (S) of species pools, but is largely untested. We tested whether (1) species accumulation curves follow the form predicted by the model, (2) the model gives unbiased estimates (Ŝ and B̂, respectively) of S and of the sample size, B, needed to detect S/2 species, and (3) performance is robust to community structure
Authors
K.A. Keating, J.F. Quinn
Near to the edge of an ice sheet Near to the edge of an ice sheet
No abstract available.
Authors
Steven W. Hostetler
Glacier recession and ecological implications at Glacier National Park, Montana Glacier recession and ecological implications at Glacier National Park, Montana
No abstract available.
Authors
C.H. Key, S. Johnson, D.B. Fagre, R. K. Menicke
Ecosystem dynamics of the Northern Rocky Mountains, USA Ecosystem dynamics of the Northern Rocky Mountains, USA
No abstract available.
Authors
D.B. Fagre, C.H. Key, J.D. White, S. W. Running, F. R. Hauer, R.E. Keane, K. C. Ryan
Imperiled mammalian fauna of aquatic ecosystems in the Southeast: A management perspective Imperiled mammalian fauna of aquatic ecosystems in the Southeast: A management perspective
Management of imperiled mammals associated with aquatic ecosystems in the southeastern United States ranges from almost no management for some species to intensive, high-profile programs for others. Aquatic mammals are notoriously difficult to census because they are often secretive, trap-wary, relatively rare, or have extensive movement patterns. As a result, conservation efforts aimed...
Authors
J. D. Clark, M. J. Harvey