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: 1357
Processes and rates of sediment and wood accumulation in headwater streams of the Oregon Coast Range, USA Processes and rates of sediment and wood accumulation in headwater streams of the Oregon Coast Range, USA
Channels that have been scoured to bedrock by debris flows provide unique opportunities to calculate the rate of sediment and wood accumulation in low-order streams, to understand the temporal succession of channel morphology following disturbance, and to make inferences about processes associated with input and transport of sediment. Dendrochronology was used to estimate the time since...
Authors
Christine L. May, Robert E. Gresswell
Conservation of North American stream amphibians Conservation of North American stream amphibians
Abstract has not been submitted
Authors
P.S. Corn, R.B. Bury, E.J. Hyde
Characterizing grazing disturbance in semiarid ecosystems across broad spatial scales using multiple indices. Characterizing grazing disturbance in semiarid ecosystems across broad spatial scales using multiple indices.
Although management and conservation strategies continue to move toward broader spatial scales and consideration of many taxonomic groups simultaneously, researchers have struggled to characterize responses to disturbance at these scales. Most studies of disturbance by feral grazers investigate effects on only one or two ecosystem elements across small spatial scales, limiting their...
Authors
Erik A. Beever, Robin J. Tausch, Peter F. Brussard
Spread of hybridization between native westslope cutthroat trout, Oncorhynchus clarki lewisi, and nonnative rainbow trout, Oncorhynchus mykiss Spread of hybridization between native westslope cutthroat trout, Oncorhynchus clarki lewisi, and nonnative rainbow trout, Oncorhynchus mykiss
We examined spatial and temporal patterns of hybridization between native westslope cutthroat trout, Oncorhynchus clarki lewisi, and nonnative rainbow trout, O. mykiss, in streams of the Flathead River system in Montana, U.S.A. We detected hybridization in 24 of 42 sites sampled from 1998 to 2001. We found new Oncorhynchus mykiss introgression in seven of 11 sample populations that were...
Authors
Nathaniel P. Hitt, Christopher A. Frissell, Clint C. Muhlfeld, Fred W. Allendorf
Modeling a complex conceptual theory of population change in the Shiras moose: History and recasting as a structural equation model Modeling a complex conceptual theory of population change in the Shiras moose: History and recasting as a structural equation model
No abstract available.
Authors
Bruce H. Pugesek
Ecological implications of bovine tuberculosis in African Buffalo herds Ecological implications of bovine tuberculosis in African Buffalo herds
Following the recent invasion of bovine tuberculosis (BTB) into the Kruger National Park, South Africa, we conducted a study on the maintenance host, African buffalo, to investigate associations between BTB prevalence and calf:cow ratio, age structure, body condition, and endoparasite load. Statistical analyses compared herds of zero, medium (1–40%), and high (>40%) BTB prevalence. To...
Authors
Alex Caron, Paul C. Cross, Johan T. du Toit
Guidelines for the implementation and publication of structural equation models Guidelines for the implementation and publication of structural equation models
No abstract available
Authors
Bruce H. Pugesek, Adrian Tomer
Creation of the Teton landscape: A geologic chronicle of Jackson Hole and The Teton Range Creation of the Teton landscape: A geologic chronicle of Jackson Hole and The Teton Range
Geology is the science of the Earth-the study of the forces, processes, and past life that not only shape our land but influence our daily lives and our Nation's welfare. This booklet, prepared by two members of the U.S. Geological Survey, discusses how geologic phenomena are responsible for the magnificent scenery of the Teton region
Authors
John Calvin Reed, David Love, Kenneth Pierce
Artificial intelligence based decision support for trumpeter swan management Artificial intelligence based decision support for trumpeter swan management
The number of trumpeter swans (Cygnus buccinator) breeding in the Tri-State area where Montana, Idaho, and Wyoming come together has declined to just a few hundred pairs. However, these birds are part of the Rocky Mountain Population which additionally has over 3,500 birds breeding in Alberta, British Columbia, Northwest Territories, and Yukon Territory. To a large degree, these birds...
Authors
Richard S. Sojda
Mitochondrial phylogeography of moose (Alces alces): Late Pleistocene divergence and population expansion Mitochondrial phylogeography of moose (Alces alces): Late Pleistocene divergence and population expansion
We examined phylogeographic relationships of moose (Alces alces) worldwide to test the proposed existence of two geographic races and to infer the timing and extent of demographic processes underpinning the expansion of this species across the Northern Hemisphere in the late Pleistocene. Sequence variation within the left hypervariable domain of the control region occurred at low or...
Authors
Kris J. Hundertmark, Gerald F. Shields, Irina G. Udina, R. Terry Bowyer, Alexei A. Danilkin, Charles C. Schwartz
Bayesian time series analysis of segments of the Rocky Mountain trumpeter swan population Bayesian time series analysis of segments of the Rocky Mountain trumpeter swan population
A Bayesian time series analysis technique, the dynamic linear model, was used to analyze counts of Trumpeter Swans (Cygnus buccinator) summering in Idaho, Montana, and Wyoming from 1931 to 2000. For the Yellowstone National Park segment of white birds (sub-adults and adults combined) the estimated probability of a positive growth rate is 0.01. The estimated probability of achieving the
Authors
Christopher K. Wright, Richard S. Sojda, Daniel Goodman