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: 987
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Year Published: 2020

Context-dependent effects of livestock grazing in deserts of western North America

This chapter provides a general review of grazing disturbance by large mammalian grazers and the role of ecological context in moderating its effects, with emphasis on North American deserts. It discusses the ecological consequences of cessation of livestock grazing and present a case study from the Mojave Desert, United States of America. A...

Veblen, Kari E.; Beever, Erik A.; Pyke, David A.

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Year Published: 2020

Global status of trout and char: Conservation challenges in the twenty-first century

Freshwater ecosystems are among the most threatened ecosystems in the world (Richter et al. 1997; Strayer and Dudgeon 2010), and freshwater fishes may now be the most threatened group of vertebrates (Ricciardi and Rasmussen 1999; Vorosmarty et al. 2010; Darwall and Freyhof 2016). Of the 7,300 freshwater fish species globally assessed by the...

Muhlfeld, Clint C.; Dauwalter, Daniel C.; D'Angelo, Vincent S.; Ferguson, Andrew; Giersch, J. Joseph; Impson, Dean; Koizumi, Itsuro; Kovach, Ryan; McGinnity, Philip; Schoeffmann, Johannes; Epifanio, John; Vøllestad, Leif Asbjørn

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Year Published: 2020

Applying spatially explicit capture–recapture models to estimate black bear density in South Carolina

Population density is an important component of wildlife management decisions, but can be difficult to estimate directly for an itinerant, wide‐ranging species such as the American black bear (Ursus americanus ). In South Carolina, USA, where there has been growth in black bear populations and bear–human‐conflict reports during the past...

Azad, Shefali; McFadden, Katherine; Clark, Joseph D.; Wactor, Tammy; Jachowski, David S.

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Year Published: 2020

Species-specific responses to wetland mitigation among amphibians in the Greater Yellowstone Ecosystem

Habitat loss and degradation are leading causes of biodiversity declines, therefore assessing the capacity of created mitigation wetlands to replace habitat for wildlife has become a management priority. We used single season occupancy models to compare the occurrence of larvae of four species of pond‐breeding amphibians in wetlands created for...

Swartz, LK; Lowe, WH; Muths, Erin L.; Hossack, Blake R.

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Year Published: 2020

Connectivity in the Crown: Highway 2 wildlife crossings

This report summarizes data collected to inform decisions on how to best mitigate the effects on wildlife migration from increasing traffic, development, and recreation along US highway 2. The highway, railway, and river split the Crown of the Continent Ecosystem. This data addresses SO 3362 by providing information on major wildlife trails,...

Waller, John S.; Graves, Tabitha; Anderson, Brad; Kittson, Brandon; Gaulke, Sarah Mccrimmon
Waller, J, TA Graves, B Anderson, B Kittson, S Gaulke. 2020. Connectivity in the Crown: Highway 2 Wildlife Crossing 2019 Report. Unpublished report. National Park Service, Glacier National Park. 37 pp.

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Year Published: 2019

Contrasting demographic responses of toad populations to regionally synchronous pathogen (Batrachochytrium dendrobatidis) dynamics

We used long-term capture-recapture data from 3 boreal toad populations in western Montana to estimate how apparent survival is affected by Batrachochytrium dendrobatidis (Bd), a fungal pathogen that causes disease and has been implicated in amphibian population declines globally. Despite similar levels of Bd prevalence and synchronous pathogen...

Hossack, Blake R.; Russell, Robin E.; McCaffery, Rebecca

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Year Published: 2019

Primarily resident grizzly bears respond to late-season elk harvest

Autumn ungulate hunting in the Greater Yellowstone Ecosystem carries the risk of hunter–grizzly bear (Ursus arctos) conflict and creates a substantial challenge for managers. For Grand Teton National Park, Wyoming, USA, a key information need is whether increased availability of elk (Cervus canadensis) carcasses during a late autumn (Nov–Dec)...

van Manen, Frank T.; Ebinger, Michael R.; Gustine, David D.; Haroldson, Mark A.; Wilmot, Katharine R.; Whitman, Craig

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Year Published: 2019

Whitebark pine (Pinus albicaulis) growth and defense in response to mountain pine beetle outbreaks

Whitebark pine (Pinus albicaulis) is a critical forest species of Northern Rocky Mountain upper subalpine ecosystems, yet little is known about the physiological response of whitebark pine to disturbance (e.g. fire, bark beetles, and pathogens) across a range of diverse environmental gradients. Resin–based defenses have long been recognized as the...

Kichas, Nickolas E.; Hood, Sharon M.; Pederson, Gregory T.; Everett, Richard G.; McWethy, David B.

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Year Published: 2019

Glacier retreat in Glacier National Park, Montana

Currently, the volume of land ice on Earth is decreasing, driving consequential changes to global sea level and local stream habitat. Glacier retreat in Glacier National Park, Montana, U.S.A., is one example of land ice loss and glacier change. The U.S. Geological Survey Benchmark Glacier Project conducts glaciological research and collects field...

Florentine, Caitlyn
Florentine, C., 2019, Glacier retreat in Glacier National Park, Montana (ver. 1.1, December 2019): U.S. Geological Survey Fact Sheet 2019–3068, 2 p., https://doi.org/10.3133/fs20193068.

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Year Published: 2019

Chronic wasting disease—Research by the U.S. Geological Survey and partners

IntroductionChronic wasting disease (CWD) is the only transmissible spongiform encephalopathy, a class of invariably fatal neurodegenerative mammalian diseases associated with a misfolded cellular prion protein found in wild free-ranging animals. Because it has a long incubation period, affected animals in Cervidae (the deer family; referred to as...

Hopkins, M. Camille; Carlson, Christina M.; Cross, Paul C.; Johnson, Christopher J.; Richards, Bryan J.; Russell, Robin E.; Samuel, Michael D.; Sargeant, Glen A.; Walsh, Daniel P.; Walter, W. David
Hopkins, M.C., Carlson, C.M., Cross, P.C., Johnson, C.J., Richards, B.J., Russell, R.E., Samuel, M.D., Sargeant, G.A., Walsh, D.P., and Walter, W.D., 2019, Chronic wasting disease—Research by the U.S. Geological Survey and partners (ver. 2.0, November 2019): U.S. Geological Survey Open-File Report 2019–1109, 29 p., https://doi.org/10.3133/ofr20191109.

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Year Published: 2019

A statistical forecasting approach to metapopulation viability analysis

Conservation of at‐risk species is aided by reliable forecasts of the consequences of environmental change and management actions on population viability. Forecasts from conventional population viability analysis (PVA) are made using a two‐step procedure in which parameters are estimated, or elicited from expert opinion, and then plugged into a...

Howell, Paige E.; Hossack, Blake R.; Muths, Erin L.; Sigafus, Brent; Chenevert-Steffler, A; Chandler, Richard B.

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Year Published: 2019

Introduction: Defining and interpreting ecological disturbances

Within the field of ecology, disturbance can be defined as a physical force, agent, or process, either abiotic or biotic, causing a perturbation or stress, to an ecological component or system, relative to a specified reference state and/or system. Disturbance drive ecosystems, and our understanding of how disturbances interact with biological...

Beever, Erik A.; Sethi, Suresh Andrew; Prange, Suzanne; DellaSala, Dominick