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: 1,023
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Year Published: 2021

Thermal constraints on energy balance, behaviour and spatial distribution of grizzly bears

1. Heat dissipation limit theory posits that energy available for growth and reproduction in endotherms is limited by their ability to dissipate heat. In mammals, endogenous heat production increases markedly during gestation and lactation, and thus female mammals may be subject to greater thermal constraints on energy expenditure than males. Such...

Rogers, Savannah A.; Robbins, Charlie T.; Mathewson, Paul D.; Carnahan, Anthony M.; van Manen, Frank T.; Haroldson, Mark A.; Porter, Warren P.; Rogers, Taylor R.; Soule, Terrence; Long, Ryan A.

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Year Published: 2021

Identification of Global Priorities for New Mountain Protected and Conserved Areas

Mountain ecosystems are extremely diverse and fragile. They include astonishing biodiversity in terms of number of taxa and endemicity, and globally provide the most diverse range of ecosystem services. The world’s system of protected and conserved areas includes many outstanding areas within the earth’s mountainous landscape: about 19% of...

Jacobs, Peter; Beever, Erik A.; Carbutt, Clinton; Foggin, Marc; Juffe-Bignoli, Diego; Martin, Madeline Thomas; Orchard, Shane; Sayre, Roger

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Year Published: 2021

Freezing in a warming climate: Marked declines of a subnivean hibernator after a snow drought

Recent snow droughts associated with unusually warm winters are predicted to increase in frequency and affect species dependent upon snowpack for winter survival. Changes in populations of some cold‐adapted species have been attributed to heat stress or indirect effects on habitat from unusually warm summers, but little is known about the...

Johnston, Aaron; Christophersen, Roger G; Beever, Erik A.; Ransom, Jason I.

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Year Published: 2021

Snowpack signals in North American tree rings

Climate change has contributed to recent declines in mountain snowpack and earlier runoff, which in turn has intensified hydrological droughts in western North America. Climate model projections suggest that continued and severe snowpack reductions are expected over the 21st century, with profound consequences for ecosystems and human welfare. Yet...

Coulthard, Bethany L.; Anchukaitis, Kevin J.; Pederson, Gregory T.; Cook, Edward R; Littell, Jeremy S.; Smith, Dan J.

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Year Published: 2021

Upper Colorado River Basin 20th century droughts under 21st century warming: Plausible scenarios for the future

This study builds on a collaboration with a water resource management community of practice in the Upper Colorado River Basin to develop scenarios of future drought and assess impacts on water supply reliability. Water managers are concerned with the impacts of warming on water year streamflow, but uncertainties in projections of climate make the...

Woodhouse, Connie A.; Smith, Rebecca M.; McAfee, Stephanie A.; Pederson, Gregory T.; McCabe, Gregory J.; Miller, W. Paul; Csank, Adam

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Year Published: 2021

High elevation ice patch documents Holocene climate variability in the northern Rocky Mountains

Paleoclimate records from ice cores generally are considered to be the most direct indicators of environmental change, but are rare from mid-latitude, continental regions such as the western United States. High-elevation ice patches are known to be important archaeological archives in alpine regions and potentially could provide records important...

Chellman, Nathan J.; Pederson, Gregory T.; Lee, Craig; McWethy, Dave; Pusman, Kathryn; Stone, Jeffery R.; Brown, Sabrina R.; McConnell, Joseph R.

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Year Published: 2021

Influence of water temperature and biotic interactions on the distribution of westslope cutthroat trout (Oncorhynchus clarkii lewisi) in a population stronghold under climate change

Climate warming is expected to have substantial impacts on native trout across the Rocky Mountains, but there is little understanding of how these changes affect future distributions of co-occurring native fishes within population strongholds. We used mixed-effects logistic regression to investigate the role of abiotic (e.g., temperature) and...

Heinle, Kadie; Eby, Lisa A; Muhlfeld, Clint C.; Steed, Amber; Jones, Leslie; D'Angelo, Vincent S.; Whiteley, Andrew R.; Hubblewhite, Mark

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Year Published: 2021

It’s complicated…environmental DNA as a predictor of trout and char abundance in streams

The potential to provide inferences about fish abundance from environmental (e)DNA samples has generated great interest. However, the accuracy of these abundance estimates is often low and variable across species and space. A plausible refinement is the use of common aquatic habitat monitoring data to account for attributes that influence eDNA...

Sepulveda, Adam J.; Al-Chokhachy, Robert; Laramie, Matthew; Crapster, Kyle; Knotek, Ladd; Miller, Brian T.; Zale, Alexander V.; Pilliod, David

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Year Published: 2021

Hybridization alters growth and migratory life-history expression of native trout

Human-mediated hybridization threatens many native species, but the effects of introgressive hybridization on life-history expression are rarely quantified, especially in vertebrates. We quantified the effects of non-native rainbow trout admixture on important life-history traits including growth and partial migration behavior in three populations...

Strait, Jeffrey; Eby, Lisa A; Kovach, Ryan P.; Muhlfeld, Clint C.; Boyer, Matthew; Amish, Stephen J.; Smith, Seth; Lowe, Winsor H.; Luikart, Gordon

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Year Published: 2021

Group density, disease, and season shape territory size and overlap of social carnivores

1. The spatial organization of a population can influence the spread of information, behaviour, and pathogens. Territory size and territory overlap, components of spatial organization, provide key information as these metrics may be indicators of habitat quality, resource dispersion, contact rates, and environmental risk (e.g., indirectly...

Brandell, E. E.; Fountain-Jones, Nicholas M.; Gilbertson, Marie L. J.; Cross, Paul; Hudson, P. J.; Smith, Douglas W.; Stahler, Daniel R.; Packer, Craig; Craft, Meggan E.

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Year Published: 2021

Estimating inundation of small waterbodies with sub-pixel analysis of Landsat imagery: Long-term trends in surface water area and evaluation of common drought indices

Small waterbodies are numerically dominant in many landscapes and provide several important ecosystem services, but automated measurement of waterbodies smaller than a standard Landsat pixel (0.09 ha) remains challenging. To further evaluate sub‐Landsat pixel techniques for estimating inundation extent of small waterbodies (basin area: 0.06–1...

Sall, Ibrahima; Jarchow, Christopher J.; Sigafus, Brent H.; Eby, Lisa A; Forzley, Michael James; Hossack, Blake R.

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Year Published: 2020

The elephant in the lab (and field): Contamination in aquatic environmental DNA studies

The rapid evolution of environmental (e)DNA methods has resulted in knowledge gaps in smaller, yet critical details like proper use of negative controls to detect contamination. Detecting contamination is vital for confident use of eDNA results in decision-making. We conducted two literature reviews to summarize (a) the types of quality assurance...

Sepulveda, Adam J.; Hutchins, Patrick R.; Forstchen, Meghan; Mckeefry, Madeline; Swigris, Anna M