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: 2020

Dynamics, variability, and change in seasonal precipitation reconstructions for North America

Cool and warm season precipitation totals have been reconstructed on a gridded basis for North America using 439 tree-ring chronologies correlated with December-April totals and 547 different chronologies correlated with May-July totals. These discrete seasonal predictor chronologies are not significantly correlated with the alternate season and...

Stahle, David W.; Cook, Edward R; Burnette, Dorian J; Torbenson, Max C.A.; Howard, Ian M; Griffin, Daniel; Villanueva Diaz, Jose; Cook, Benjamin I.; Williams, Park A.; Watson, Emma; Sauchyn, David J.; Pederson, Neil; Woodhouse, Connie A.; Pederson, Gregory T.; Meko, David M.; Coulthard, Bethany; Crawford, Christopher J.

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Year Published: 2020

A call for global action to conserve native trout in the 21st century and beyond

Trout and char (hereafter, trout ) represent some of the more culturally, economically and ecologically important taxa of freshwater fishes worldwide (Kershner, Williams, Gresswell, & Lobón‐Cerviá, 2019a). Native to all continents in the Northern Hemisphere (as well as western Mediterranean Africa), trout belong to seven genera...

Dauwalter, Daniel C.; Duchi, Antonino; Epifanio, John; Gandolfi, A.J.; Gresswell, Robert E.; Juanes, Francis; Kershner, Jeffrey L.; Lobón-Cerviá, Javier; McGinnity, Philip; Meraner, Andreas; Mikheev, Pavel; Morita, Kentaro; Muhlfeld, Clint C.; Pinter, Kurt; Post, John; Unfer, Gunther; Vøllestad, Leif Asbjørn; Williams, Jack E.

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Year Published: 2020

Revealing migration and reproductive habitat of invasive fish under an active population suppression program

Endemic species face a variety of threats including predation from non‐native invaders. In some cases, however, invasive species can be managed by directly suppressing populations, and tracking technologies that allow researchers to identify movement patterns and aggregations representative of the population can facilitate suppression activities....

Gutowsky, Lee F. G.; Romine, Jason G.; Heredia, Nicholas A.; Bigelow, Patricia E.; Parsley, Michael J.; Sandstrom, Philip T.; Suski, Cory D.; Danylchuk, Andy J.; Cooke, Steven J.; Gresswell, Robert E.

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Year Published: 2020

Amphibian chytrid prevalence on boreal toads in SE Alaska and NW British Columbia: Tests of habitat, life stages, and temporal trends

Tracking and understanding variation in pathogens such as Batrachochytrium dendrobatidis ([Bd]), which causes amphibian chytridiomycosis and has caused population declines globally, is a priority for many land managers. However, there has been relatively little sampling of amphibian communities at high latitudes. We used skin swabs collected...

Hossack, Blake R.; Adams, Michael J.; Honeycutt, R Ken; Belt, Jami J; Pyare, S

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Year Published: 2020

A round-robin evaluation of the repeatability and reproducibility of environmental DNA assays for dreissenid mussels

Resource managers may be hesitant to make decisions based on environmental (e)DNA results alone since eDNA is an indirect method of species detection. One way to reduce the uncertainty of eDNA is to identify laboratory‐based protocols that ensure repeatable and reproducible results. We conducted a double‐blind round‐robin analysis of probe‐based...

Sepulveda, Adam J.; Hutchins, Patrick R.; Jackson, Craig; Ostberg, Carl; Laramie, Matthew; Amberg, Jon J.; Counihan, Timothy; Hoegh, Andrew B.; Pilliod, David

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Year Published: 2020

Co-occurence of Chiricahua leopard frogs (Lithobates chiricahuensis) with sunfish (Lepomis)

Invasive species are a major threat to the persistence of native species, particularly in systems where ephemeral aquatic habitats have been replaced by permanent water and predators, such as fish, have been introduced. Within the Altar Valley, Arizona, the invasive American bullfrog, Lithobates catesbeianus (formerly Rana...

Howell, Paige E.; Sigafus, Brent H.; Hossack, Blake R.; Muths, Erin L.

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Year Published: 2020

Rapid early development and feeding benefits an invasive population of lake trout

Lake trout (Salvelinus namaycush) were discovered in Yellowstone Lake in 1994 and their population expanded dramatically despite intensive suppression. The lake is species-depauperate, with no major lake trout embryo predators. We hypothesized that without this predation threat, lake trout free embryo feeding and growth may be greater than in...

Simard, Lee G.; Marsden, J Ellen; Gresswell, Robert E.; Euclide, Megan

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Year Published: 2020

Parsing the effects of demography, climate, and management on recurrent brucellosis outbreaks in elk

1. Zoonotic pathogens can harm human health and well-being directly or by impacting livestock. Pathogens that spillover from wildlife can also impair conservation efforts if humans perceive wildlife as pests. Brucellosis, caused by the bacterium Brucella abortus, circulates in elk and bison herds of the Greater Yellowstone Ecosystem and poses a...

Cotterill, Gavin G.; Cross, Paul; Merkle, J. A.; Rogerson, JD; Scurlock, BM; Du Toit, Johan T.

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Year Published: 2020

Survival and conflict behavior of American black bears after rehabilitation

Wildlife agencies face difficult situations when orphaned or injured American black bear (Ursus americanus ) cubs (<12 months old) or yearlings (≥12 and <24 months old) are captured. One option is bear rehabilitation, the care and feeding of cubs or yearlings in a semi‐natural environment, followed by release. Unfortunately, the...

Blair, Coy D; Muller, Lisa I; Clark, Joseph D.; Stiver, William H

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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.