Northern Rocky Mountain Science Center

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: 996
Publication Thumbnail
Year Published: 2002

Bayesian time series analysis of segments of the Rocky Mountain trumpeter swan population

A Bayesian time series analysis technique, the dynamic linear model, was used to analyze counts of Trumpeter Swans (Cygnus buccinator) summering in Idaho, Montana, and Wyoming from 1931 to 2000. For the Yellowstone National Park segment of white birds (sub-adults and adults combined) the estimated probability of a positive growth rate is 0.01. The...

Wright, Christopher K.; Sojda, Richard S.; Goodman, Daniel

Publication Thumbnail
Year Published: 2002

Fuzzy logic merger of spectral and ecological information for improved montane forest mapping.

Environmental data are often utilized to guide interpretation of spectral information based on context, however, these are also important in deriving vegetation maps themselves, especially where ecological information can be mapped spatially. A vegetation classification procedure is presented which combines a classification of spectral data from...

White, Joseph D.; Running, Steven W.; Ryan, Kevin C.; Key, Carl H.

Publication Thumbnail
Year Published: 2002

Transforming the Rockies: Human forces, settlement patterns, and ecosystem effects

The current ecological condition of the Rocky Mountains can be viewed from two somewhat opposing perspectives. The first is that human occupation has had relatively little effect on the Rockies: large natural, if not pristine, areas remain, and the region's open spaces provide wildlife habitat, majestic scenery, and a sense of wildness. Unlike the...

Baron, Jill; Travis, William R.; Theobald, David M.; Fagre, Daniel B.

Publication Thumbnail
Year Published: 2002

Rocky road in the Rockies: Challenges to biodiversity

To people worldwide, the Rocky Mountains of the United States and Canada represent a last bastion of nature in its purest and rawest form-unspoiled forests teeming with elk and deer stalked by mountain lions and grizzly bears; bald eagles nesting near lakes and rivers; fat, feisty native trout in rushing mountain streams; and dazzling arrays of...

Baron, Jill; Tomback, Diana F.; Kendall, Katherine C.

Publication Thumbnail
Year Published: 2002

The northern Yellowstone elk: density dependence and climatic conditions

We analyzed a time series of estimates of elk (Cervus elaphus) numbers on the northern Yellowstone winter range from 1964 to 1979 and 1986 to 1995 using a variety of discrete time stochastic population dynamic models. These models included adjustments for density, an increase in the area of winter range used by elk, lagged effects of the weather...

Taper, Mark L.; Gogan, Peter J.P.

Publication Thumbnail
Year Published: 2002

Development of an expert system for assessing trumpeter swan breeding habitat in the Northern Rocky Mountains.

A decision support system for the management of the Rocky Mountain Population of Trumpeter Swans (Cygnus buccinators) is being developed. As part of this, three expert systems are also in development: one for assessing the quality of Trumpeter Swan breeding habitat; one for making water level recommendations in montane, palustrine wetlands; and...

Sojda, Richard S.; Cornely, John E.; Howe, Adele E.

Publication Thumbnail
Year Published: 2002

A model to predict the occurrence of surviving butternut trees in the southern Appalachian region: Chapter 43

No abstract available.

Scott, J. Michael; Heglund, Patricia J.; Morrison, Michael L.; Haufler, Jonathan B.; Raphael, Martin G.; Wall, William A.; Samson, Fred B.; van Manen, Frank T.; Clark, Joseph D.; Schlarbaum, Scott E.; Johnson, Kristine D.; Taylor, Glenn

Publication Thumbnail
Year Published: 2002

A half century of change in alpine treeline patterns at Glacier National Park, Montana, U.S.A.

Using sequential aerial photography, we identified changes in the spatial distribution of subalpine fir (Abies lasiocarpa) habitat at the alpine treeline ecotone. Six 40-ha study sites in the McDonald Creek drainage of Glacier National Park contained subalpine fir forests that graded into alpine tundra. Over a 46-yr period, altitudinal changes in...

Klasner, F.L.; Fagre, D.B.
A half century of change in alpine treeline patterns at Glacier National Park, Montana, U.S.A.; 2002; Article; Journal; Arctic, Antarctic, and Alpine Research; Klasner, F. L.; Fagre, D. B.

Publication Thumbnail
Year Published: 2002

An application of queuing theory to waterfowl migration

There has always been great interest in the migration of waterfowl and other birds. We have applied queuing theory to modelling waterfowl migration, beginning with a prototype system for the Rocky Mountain Population of trumpeter swans (Cygnus buccinator) in Western North America. The queuing model can be classified as a D/BB/28 system, and we...

Rizzoli, A.E.; Jakeman, A.J.; Sojda, Richard S.; Cornely, John E.; Fredrickson, Leigh H.
An application of queuing theory to waterfowl migration; 2002; Book chapter; Report; Integrated Assessment and Decision Support: Proceedings of the First Biennial Meeting of the International Environmental Modelling and Software Society; Sojda, R. S.; Cornely, J. E.; Fredrickson, L. H.

Publication Thumbnail
Year Published: 2002

An evaluation of long-term preservation methods for brown bear (Ursus arctos) faecal DNA samples

Relatively few large-scale faecal DNA studies have been initiated due to difficulties in amplifying low quality and quantity DNA template. To improve brown bear faecal DNA PCR amplification success rates and to determine post collection sample longevity, five preservation methods were evaluated: 90% ethanol, DETs buffer, silica-dried, oven-dried...

Murphy, M.A.; Waits, L.P.; Kendall, K.C.; Wasser, S.K.; Higbee, J.A.; Bogden, R.
An evaluation of long-term preservation methods for brown bear (Ursus arctos) faecal DNA samples; 2002; Article; Journal; Conservation Genetics; Murphy, M. A.; Waits, L. P.; Kendall, K. C.; Wasser, S. K.; Higbee, J. A.; Bogden, R.

Publication Thumbnail
Year Published: 2002

Assessing browse trend at the landscape level, Parts 1 and 2

Keigley, R.B.; Frisina, M.R.; Fager, C.
Assessing browse trend at the landscape level, Parts 1 and 2; 2002; Article; Journal; Rangelands; Keigley, R. B.; Frisina, M. R.; Fager, C.

Publication Thumbnail
Year Published: 2002

Establishing aquatic restoration priorities using a watershed approach

Bohn, B.; Kershner, J.L.
Establishing aquatic restoration priorities using a watershed approach; 2002; Article; Journal; Journal of Environmental Management; Bohn, B.; Kershner, J. L.