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: 1,017
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Year Published: 2021

Scavengers reduce potential brucellosis transmission risk in the Greater Yellowstone Ecosystem

Scavengers likely play an important role in ecosystem energy flow as well as disease transmission, but whether they facilitate or reduce disease transmission is often unknown. In the Greater Yellowstone Ecosystem, scavengers are likely to reduce the transmission and subsequent spread of brucellosis within and between livestock and elk by consuming...

Szcodronski, Kimberly E; Cross, Paul

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Year Published: 2021

Staggered-entry analysis of breeding phenology and occupancy dynamics of Arizona toads from historically occupied habitats of New Mexico, USA

For species with variable phenology, it is often challenging to produce reliable estimates of population dynamics or changes in occupancy. The Arizona Toad (Anaxyrus microscaphus) is a southwestern USA endemic that has been petitioned for legal protection, but status assessments are limited by a lack of information on population trends. Also,...

Forzley, MJ; Ryan, Mason J.; Latella, IM; Giermakowski, JT; Muths, Erin L.; Sigafus, Brent H.; Hossack, Blake R.

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Year Published: 2021

Natural history of a bighorn sheep pneumonia epizootic: Source of infection, course of disease, and pathogen clearance

A respiratory disease epizootic at the National Bison Range (NBR) in Montana in 2016–2017 caused an 85% decline in the bighorn sheep population, documented by observations of its unmarked but individually identifiable members, the subjects of an ongoing long-term study. The index case was likely one of a small group of young bighorn sheep on a...

Besser, T. E.; Cassirer, E. Frances; Lisk, Amy; Nelson, Danielle; Manlove, Kezia R.; Cross, Paul; Hogg, John T.

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Year Published: 2021

Amphibian population responses to mitigation: Relative importance of wetland age and design

Wetland creation is a common practice to mitigate for the loss of natural wetlands. However, there is still uncertainty about how effectively created wetlands replace habitat provided by natural wetlands. This uncertainty is due in part because post-construction monitoring of biological communities, and vertebrates especially, is rare and...

Oja, Emily Bea; Swartz, Leah S; Muths, Erin L.; Hossack, Blake R.

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Year Published: 2021

Corticosterone mediates a growth-survival tradeoff for an amphibian exposed to increased salinity

Life-history tradeoffs are common across taxa, but growth-survival tradeoffs—usually enhancing survival at a cost to growth—are less frequently investigated. Increased salinity (NaCl) is a prevalent anthropogenic disturbance that may cause a growth-survival tradeoff for larval amphibians. Although physiological mechanisms mediating tradeoffs are...

Tornabene, BJ; Hossack, Blake R.; Crespi, EJ; Breuner, CW

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Year Published: 2021

Agent-based models for collective animal movement: Proximity-induced state switching

Animal movement is a complex phenomenon where individual movement patterns can be influenced by a variety of factors including the animal’s current activity, available terrain and habitat, and locations of other animals. Motivated by modeling grizzly bear movement in the Greater Yellowstone Ecosystem, this article presents an agent-based model...

Hoegh, Andrew B.; van Manen, Frank T.; Haroldson, Mark A.

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Year Published: 2021

Physiological consequences of consuming low-energy foods: Herbivory coincides with a stress response in Yellowstone bears.

Meat, fruit, seeds and other high-energy bear foods are often highly localized and briefly available and understanding which factors influence bear consumption of these foods is a common focus of bear conservation and ecology. However, the most common bear foods, graminoids and forbs, are more widespread but of lower quality. We poorly understand...

Christianson, David A; Coleman, Tyler H; Doan, Quint; Haroldson, Mark A.

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Year Published: 2021

U.S. Geological Survey science for the Wyoming Landscape Conservation Initiative—2018 annual report

The Wyoming Landscape Conservation Initiative (WLCI) was established in 2007 as a collaborative interagency partnership to develop and implement science-based conservation actions. During the past 11 years, partners from U.S. Geological Survey (USGS), State and Federal land management agencies, universities, and the public have collaborated to...

Anderson, Patrick J.; Aldridge, Cameron L.; Alexander, Jason S.; Assal, Timothy J.; Aulenbach, Steven; Bowen, Zachary H.; Chalfoun, Anna D.; Chong, Geneva W.; Copeland, Holly; Edmunds, David R.; Germaine, Steve; Graves, Tabitha; Heinrichs, Julie A.; Homer, Collin G.; Huber, Christopher; Johnston, Aaron; Kauffman, Matthew J.; Manier, Daniel J.; McShane, Ryan R.; Eddy-Miller, Cheryl A.; Miller, Kirk A.; Monroe, Adrian P.; O'Donnell, Michael S.; Ortega, Anna; Walters, Annika W.; Wieferich, Daniel J.; Wyckoff, Teal B.; Zeigenfuss, Linda
Anderson, P.J., Aldridge, C.L., Alexander, J.S., Assal, T.J., Aulenbach, S., Bowen, Z.H., Chalfoun, A.D., Chong, G.W., Copeland, H., Edmunds, D.R., Germaine, S., Graves, T., Heinrichs, J.A., Homer, C.G., Huber, C.C., Johnston, A., Kauffman, M.J., Manier, D.J., McShan, R.R., Eddy-Miller, C.A., Miller, K.A., Monroe, A.P., O’Donnell, M.S., Ortega, A., Walters, A.W., Wieferich, D., Wyckoff, T.B., and Zeigenfuss, L., 2020, U.S. Geological Survey science for the Wyoming Landscape Conservation Initiative—2018 annual report: U.S. Geological Survey Open-File Report 2021–1067, 33 p., https://doi.org/10.3133/ofr20211067.

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Year Published: 2021

Evaluating corticosterone as a biomarker for amphibians exposed to increased salinity and ambient corticosterone

Physiological biomarkers are commonly used to assess the health of taxa exposed to natural and anthropogenic stressors. Glucocorticoid (GC) hormones are often used as indicators of physiological stress in wildlife because they affect growth, reproduction and survival. Increased salinity from human activities negatively influences amphibians and...

Tornabene, Brian J.; Hossack, Blake R.; Crespi, Erica J; Breuner, Creagh W

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Year Published: 2021

Metal accumulation varies with life history, size, and development of larval amphibians

Amphibian larvae are commonly used as indicators of aquatic ecosystem health because they are susceptible to contaminants. However, there is limited information on how species characteristics and trophic position influence contaminant loads in larval amphibians. Importantly, there remains a need to understand whether grazers (frogs and...

Smalling, Kelly; Oja, Emily Bea; Cleveland, Danielle; Davenport, Jon D; Eagles-Smith, Collin; Campbell Grant, Evan H.; Kleeman, Patrick M.; Halstead, Brian J.; Stemp, Kenzi M; Tornabene, Brian J.; Bunnell, Zachary J; Hossack, Blake R.

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Year Published: 2021

Resilience to fire and resistance to annual grass invasion in sagebrush ecosystems of US National Parks

Western North American sagebrush shrublands and steppe face accelerating risks from fire-driven feedback loops that transition these ecosystems into self-reinforcing states dominated by invasive annual grasses. In response, sagebrush conservation decision-making is increasingly done through the lens of resilience to fire and annual grass...

Rodhouse, Thomas J.; Lonneker, Jeffrey; Bowersock, Lisa; Popp, Diana; Thompson, Jamela; Dicus, Gordon; Irvine, Kathryn M.

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Year Published: 2021

Spatial Gaussian processes improve multi-species occupancy models when range boundaries are uncertain and nonoverlapping

Species distribution models enable practitioners to analyze large datasets of encounter records and make predictions about species occurrence at unsurveyed locations. In omnibus surveys that record data on multiple species simultaneously, species ranges are often nonoverlapping and misaligned with the administrative unit defining the spatial...

Wright, Wilson; Irvine, Kathryn M.; Rodhouse, Tom; Litt, Andrea R.