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: 1,002
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Year Published: 2003

Taking the pulse of mountains: Ecosystem responses to climatic variability

An integrated program of ecosystem modeling and field studies in the mountains of the Pacific Northwest (U.S.A.) has quantified many of the ecological processes affected by climatic variability. Paleoecological and contemporary ecological data in forest ecosystems provided model parameterization and validation at broad spatial and temporal scales...

Fagre, Daniel B.; Peterson, David L.; Hessl, Amy E.
Taking the pulse of mountains: Ecosystem responses to climatic variability; 2003; Conference Paper; Climatic Change; Fagre, D. B.; Peterson, D. L.; Hessl, A. E.

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Year Published: 2003

The influence of diet on faecal DNA amplification and sex identification in brown bears (Ursus arctos)

To evaluate the influence of diet on faecal DNA amplification, 11 captive brown bears (Ursus arctos) were placed on six restricted diets: grass (Trifolium spp., Haplopappus hirtus and Poa pratensis), alfalfa (Lupinus spp.), carrots (Daucus spp.), white-tailed deer (Odocoileus virginianus), blueberries (Vaccinium spp.) and salmon (Salmo spp.). DNA...

Murphy, M.A.; Waits, L.P.; Kendall, K.C.
The influence of diet on faecal DNA amplification and sex identification in brown bears (Ursus arctos); 2003; Article; Journal; Molecular Ecology; Murphy, M. A.; Waits, L. P.; Kendall, K. C.

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Year Published: 2003

Use of sulfur and nitrogen stable isotopes to determine the importance of whitebark pine nuts to Yellowstone grizzly bears

Whitebark pine (Pinus albicaulis) is a masting species that produces relatively large, fat- and protein-rich nuts that are consumed by grizzly bears (Ursus arctos horribilis). Trees produce abundant nut crops in some years and poor crops in other years. Grizzly bear survival in the Greater Yellowstone Ecosystem is strongly linked to variation in...

Felicetti, L.A.; Schwartz, C.C.; Rye, R. O.; Haroldson, M.A.; Gunther, K.A.; Phillips, D.L.; Robbins, C.T.

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Year Published: 2002

Aerial survey methodology for bison population estimation in Yellowstone National Park

I developed aerial survey methods for statistically rigorous bison population estimation in Yellowstone National Park to support sound resource management decisions and to understand bison ecology. Survey protocols, data recording procedures, a geographic framework, and seasonal stratifications were based on field observations from February 1998-...

Hess, Steven C.

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Year Published: 2002

Grizzly bear denning chronology and movements in the Greater Yellowstone Ecosystem

Den entrance and emergence dates of grizzly bears (Ursus arctos) in the Greater Yellowstone Ecosystem are important to management agencies that wish to minimize impacts of human activities on bears. Current estimates for grizzly bear denning events use data that were collected from 1975–80. We update these estimates by including data obtained from...

Haroldson, Mark A.; Ternent, Mark A.; Gunther, Kerry A.; Schwartz, Charles C.

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Year Published: 2002

Hydrologic processes and nutrient dynamics in a pristine mountain catchment

Nutrient dynamics in watersheds have been used as an ecosystem-level indicator of overall ecosystem function or response to disturbance (e.g. Borman.N et al. 1974, WEBSTER et al. 1992). The examination of nutrients has been evaluated to determine responses to logging practices or other changes in watershed land use. Nutrient dynamics have been...

F. Richard Hauer; Fagre, Daniel B.; Stanford, Jack A.

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Year Published: 2002

The paradigm of grizzly bear restoration in North America

Grizzly bear restoration and recovery is a controversial, highly politicized process. By 1959, when the Craigheads began their pioneering work on Yellowstone grizzly bears, the species had been reduced to a remnant of its historic range. Prior to the colonization of North America by Europeans, the grizzly lived in relatively pristine habitats with...

Maehr, David S.; Noss, Reed F.; Larkin, J.L.; Schwartz, C. C.

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Year Published: 2002

Modeling and monitoring ecosystem responses to climate change in 3 North American mountain ranges

No abstract available

Korner, Ch.; Spehn, E.M.; Fagre, Daniel B.; Peterson, D. L.

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Year Published: 2002

Consumption of fungal sporocarps by Yellowstone grizzly bears

Sign of grizzly bears (Ursus arctos horribilis) consuming fungal sporocarps (mushrooms and truffles) was observed on 68 occasions during a study of radiomarked bears in the Yellowstone region, 1977–96. Sporocarps also were detected in 96 grizzly bear feces. Most fungi consumedby Yellowstone's grizzlybearsweremembersofthe Boletaceae(Suillus...

Mattson, David J.; Podruzny, Shannon; Haroldson, Mark A.

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Year Published: 2002

Spawning characteristics of redband trout in a headwater stream in Montana

I investigated the spawning characteristics of redband trout Oncorhynchus mykiss gairdneri (a rainbow trout subspecies) during the spring of 1998 in Basin Creek, a third-order headwater stream located in the Kootenai River drainage in northwestern Montana. I examined the timing of spawning as related to discharge and water temperature and analyzed...

Muhlfeld, Clint C.

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Year Published: 2002

History of pronghorn population monitoring, research, and management in Yellowstone National Park

Pronghorn antelope in Yellowstone National Park (YNP) persist in a small population that historically has experienced recurrent, sometimes dramatic declines. They apparently are isolated from other pronghorns, depend partly on private lands for winter range, experience heavy predation of fawns, and concentrate during winter in a relatively small...

Keating, Kim A.