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: 1197
The northern Yellowstone elk herd; management policy and natural regulation
No abstract available.
Authors
Dale R. McCullough, Koichi Kaji, Masami Yamanaka
Long-duration drought variability and impacts on ecosystem services: A case study from Glacier National Park, Montana
Instrumental climate records suggest that summer precipitation and winter snowpack in Glacier National Park (Glacier NP), Montana, vary significantly over decadal to multidecadal time scales. Because instrumental records for the region are limited to the twentieth century, knowledge of the range of variability associated with these moisture anomalies and their impacts on ecosystems and physical pr
Authors
Gregory T. Pederson, Stephen T. Gray, Daniel B. Fagre, Lisa J. Graumlich
Measurements of bed load transport on Pacific Creek, Buffalo Fork and The Snake River in Grand Teton National Park, Wyoming
Dams disrupt the flow of both of water and sediment through a watershed. Channel morphology is a function of discharge and sediment load, and perturbations caused by dams often alter channel form, causing significant geomorphic and, potentially, ecological changes (e.g. Petts and Gurnell, 2005). At the first order, dams often produce a flow regime that is profoundly altered in the timing, magnitud
Authors
Susannah O. Erwin, J. C. Schmidt
Observer error structure in bull trout redd counts in Montana streams: Implications for inference on true redd numbers
Despite the widespread use of redd counts to monitor trends in salmonid populations, few studies have evaluated the uncertainties in observed counts. We assessed the variability in redd counts for migratory bull trout Salvelinus confluentus among experienced observers in Lion and Goat creeks, which are tributaries to the Swan River, Montana. We documented substantially lower observer variability i
Authors
Clint C. Muhlfeld, Mark L. Taper, David F. Staples, Bradley B. Shepard
Estimation of temporary emigration in male toads
Male boreal toads (Bufo boreas) are thought to return to the breeding site every year but, if absent in a particular year, will be more likely to return the following year. Using Pollock's robust design we estimated temporary emigration (the probability a male toad is absent from a breeding site in a given year) at three locations in Colorado, USA: two in Rocky Mountain National Park and one in Ch
Authors
E. Muths, R. D. Scherer, P. S. Corn, B.A. Lambert
Wildlife tuberculosis in South African conservation areas: Implications and challenges
Tuberculosis, caused by Mycobacterium bovis, was first diagnosed in African buffalo in South Africa's Kruger National Park in 1990. Over the past 15 years the disease has spread northwards leaving only the most northern buffalo herds unaffected. Evidence suggests that 10 other small and large mammalian species, including large predators, are spillover hosts. Wildlife tuberculosis has also been dia
Authors
A.L. Michel, Roy G. Bengis, D.F. Keet, M. Hofmeyr, L. M. De Klerk, P.C. Cross, Anna E. Jolles, D. Cooper, I.J. Whyte, P. Buss, J. Godfroid
Landscape Assessment: Ground measure of severity, the Composite Burn Index; and Remote sensing of severity, the Normalized Burn Ratio
Abstract has not been submitted
Authors
C.H. Key, N.C. Benson
Assessment of pesticide residues in army cutworm moths (Euxoa auxiliaris) from the Greater Yellowstone Ecosystem and their potential consequences to foraging grizzly bears (Ursus arctos horribilis)
During summer, a grizzly bear (Ursus arctos horribilis) in the Greater Yellowstone Ecosystem (GYE) (USA) can excavate and consume millions of army cutworm moths (Euxoa auxiliaris) (ACMs) that aggregate in high elevation talus. Grizzly bears in the GYE were listed as threatened by the US Fish and Wildlife Service in 1975 and were proposed for delisting in 2005. However, questions remain about key b
Authors
H. L. Robison, Charles C. Schwartz, J. D. Petty, P. F. Brussard
Establishment of non-native plant species after wildfires: Effects of fuel treatments, abiotic and biotic factors, and post-fire grass seeding treatments
Establishment and spread of non-native species following wildfires can pose threats to long-term native plant recovery. Factors such as disturbance severity, resource availability, and propagule pressure may influence where non-native species establish in burned areas. In addition, pre- and post-fire management activities may influence the likelihood of non-native species establishment. In the pre
Authors
M.E. Hunter, Philip N. Omi, E.J. Martinson, G.W. Chong
Distribution of grizzly bears in the Greater Yellowstone Ecosystem, 2004
The US Fish and Wildlife Service (USFWS) proposed delisting the Yellowstone grizzly bear (Ursus arctos horribilis) in November 2005. Part of that process required knowledge of the most current distribution of the species. Here, we update an earlier estimate of occupied range (1990–2000) with data through 2004. We used kernel estimators to develop distribution maps of occupied habitats based on ini
Authors
C.C. Schwartz, M.A. Haroldson, K. Gunther, D. Moody
Yellowstone bison fetal development and phenology of parturition
No abstract available.
Authors
P.J.P. Gogan, K.M. Podruzny, E.M. Olexa, H. Ihsle Pac, K.L. Frey