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: 1334
A spatially explicit approach for evaluating relationships among coastal cutthroat trout, habitat, and disturbance in small Oregon streams A spatially explicit approach for evaluating relationships among coastal cutthroat trout, habitat, and disturbance in small Oregon streams
Abstract has not been submitted
Authors
R. E. Gresswell, C.E. Torgersen, D.S. Bateman, T.J. Guy, S.R. Hendricks, J. E. B. Wofford
Juvenile salmonid use of freshwater emergent wetlands in the floodplain and its implications for conservation management Juvenile salmonid use of freshwater emergent wetlands in the floodplain and its implications for conservation management
A recent trend of enhancing freshwater emergent wetlands for waterfowl and other wildlife has raised concern about the effects of such measures on juvenile salmonids. We undertook this study to quantify the degree and extent of juvenile Pacific salmon Oncorhynchus spp. utilization of enhanced and unenhanced emergent wetlands within the floodplain of the lower Chehalis River, Washington...
Authors
Julie A. Henning, Robert E. Gresswell, Ian A. Fleming
Effects of fire on salmonid persistence Effects of fire on salmonid persistence
No abstract available.
Authors
Robert E. Gresswell
Taxonomic and geographic variation in oviposition by tailed frogs (Ascaphus spp) Taxonomic and geographic variation in oviposition by tailed frogs (Ascaphus spp)
Tailed frogs (Ascaphus spp.) oviposit in cryptic locations in streams of the Pacific Northwest and Rocky Mountains. This aspect of their life history has restricted our understanding of their reproductive ecology. The recent split of A. montanus in the Rocky Mountains from A. truei was based on molecular differentiation, and comparisons of their ecology are limited. Our objectives were...
Authors
Nancy E. Karraker, David S. Pilliod, M. J. Adams, Evelyn L. Bull, Paul Stephen Corn, Lowell V. Diller, Marc P. Hayes, Blake R. Hossack, Garth R. Hodgson, Erin J. Hyde, Kirk Lohman, Bradford R. Norman, Lisa M. Ollivier, Christopher A. Pearl, Charles R. Peterson
High resolution tree-ring based spatial reconstructions of snow avalanche activity in Glacier National Park, Montana, USA High resolution tree-ring based spatial reconstructions of snow avalanche activity in Glacier National Park, Montana, USA
Effective design of avalanche hazard mitigation measures requires long-term records of natural avalanche frequency and extent. Such records are also vital for determining whether natural avalanche frequency and extent vary over time due to climatic or biophysical changes. Where historic records are lacking, an accepted substitute is a chronology developed from tree-ring responses to...
Authors
Gregory T. Pederson, Blase Reardon, C.J. Caruso, Daniel B. Fagre
Natural glide slab avalanches, Glacier National Park, USA: A unique hazard and forecasting challenge Natural glide slab avalanches, Glacier National Park, USA: A unique hazard and forecasting challenge
In a museum of avalanche phenomena, glide cracks and glide avalanches might be housed in the “strange but true” section. These oddities are uncommon in most snow climates and tend to be isolated to specific terrain features such as bedrock slabs. Many glide cracks never result in avalanches, and when they do, the wide range of time between crack formation and slab failure makes them...
Authors
Blase Reardon, Daniel B. Fagre, Mark Dundas, Chris Lundy
Observer error structure in bull trout redd counts in Montana streams: Implications for inference on true redd numbers 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...
Authors
Clint C. Muhlfeld, Mark L. Taper, David F. Staples, Bradley B. Shepard
Spatial heterogeneity influences native and nonnative plant species richness Spatial heterogeneity influences native and nonnative plant species richness
No abstract available.
Authors
S. Kumar, T.J. Stohlgren, G.W. Chong
Survival and growth of age-0 steelhead after surgical implantation of 23-mm passive integrated transponders Survival and growth of age-0 steelhead after surgical implantation of 23-mm passive integrated transponders
Little information is available on the effects of implanting 23-mm passive integrated transponder (PIT) tags in salmonids less than 90 mm fork length (FL). Using juvenile steelhead Oncorhynchus mykiss (range, 73–97 mm FL), we compared instantaneous growth rates and survival among three experimental groups: control, surgery with no tag, and surgery with tag. Survival rate was lower for...
Authors
D.S. Bateman, R. E. Gresswell
Wildlife tuberculosis in South African conservation areas: Implications and challenges 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...
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 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
Multi-scale responses of soil stability and invasive plants to removal of non-native grazers from an arid conservation reserve Multi-scale responses of soil stability and invasive plants to removal of non-native grazers from an arid conservation reserve
Disturbances and ecosystem recovery from disturbance both involve numerous processes that operate on multiple spatial and temporal scales. Few studies have investigated how gradients of disturbance intensity and ecosystem responses are distributed across multiple spatial resolutions and also how this relationship changes through time during recovery. We investigated how cover of non...
Authors
Erik A. Beever, Manuela M. P. Huso, David A. Pyke