Publications
Filter Total Items: 1998
Cervid forage utilization in noncommercially thinned ponderosa pine forests
To evaluate effects of noncommercial thinning, utilization of forages consumed by elk (Cervus elaphus L.), mule deer (Odocoileus hemionus Raf.), and white-tailed deer (Odocoileus virginianus Raf.) was measured in ponderosa pine (Pinus ponderosa P. & C. Lawson) stands in Custer State Park, S. D. Treatments consisted of unthinned (control; 22 to 32 m2/ha basal area), moderately thinned (12 to 22 m2/
Authors
M.C. Gibbs, J.A. Jenks, C.S. Deperno, B.F. Sowell, Kurt J. Jenkins
Terrestrial movements of juvenile and adult tailed frogs in relation to timber harvest in coastal British Columbia
Tailed frog (Ascaphus truei Stejneger) populations are at risk in much of the Pacific Northwest, and recolonization of sites may be slow postlogging. To examine the terrestrial movements of Ascaphus in clearcuts and old growth, we employed pitfall traps and drift-fence arrays installed along streams and 100 m into upland habitat. In the fall, we captured frogs farther from streams in old growth th
Authors
Tanya R. Wahbe, Fred L. Bunnell, R. Bruce Bury
Status of nesting ospreys in coastal Baja California, Sonora, and Sinaloa, Mexico, 1977 and 1992-1993
No abstract available.
Authors
Charles J. Henny, Daniel W. Anderson
Science for the changing Great Basin
The U.S. Geological Survey (USGS), with its multidisciplinary structure and role as a federal science organization, is well suited to provide integrated science in the Great Basin of the western United States. A research strategy developed by the USGS and collaborating partners addresses critical management issues in the basin, including invasive species, status and trends of wildlife populations
Authors
Erik Beever, David A. Pyke
Effects of invasive alien plants on fire regimes
Plant invasions are widely recognized as significant threats to biodiversity conservation worldwide. One way invasions can affect native ecosystems is by changing fuel properties, which can in turn affect fire behavior and, ultimately, alter fire regime characteristics such as frequency, intensity, extent, type, and seasonality of fire. If the regime changes subsequently promote the dominance of t
Authors
M.L. Brooks, C. M. D'Antonio, D.M. Richardson, J.M. DiTomaso, J.B. Grace, R.J. Hobbs, J. E. Keeley, M. Pellant, D. Pyke
Sagebrush ecosystems: current status and trends.
The sagebrush (Artemisia spp.) biome has changed since settlement by Europeans. The current distribution, composition and dynamics, and disturbance regimes of sagebrush ecosystems have been altered by interactions among disturbance, land use, and invasion of exotic plants. In this chapter, we present the dominant factors that have influenced habitats across the sagebrush biome. Using a large-scale
Authors
E.A. Beever, J.W. Connelly, S.T. Knick, M.A. Schroeder, S. J. Stiver
Vital signs monitoring plan for the Klamath Network: Phase I report
This report chronicles the Phase 1 stage of the vital signs monitoring program for the Klamath Network. It consists of two chapters and eleven appendixes. The purposes of Chapter One are to 1) describe the network administrative structure and approach to planning; 2) introduce the Klamath Network parks, their resources, and environmental settings; 3) explain the need for monitoring changes in reso
Authors
Daniel Sarr, Dennis Odion, Robert E. Truitt, Erik A. Beever, Sarah Shafer, Andrew Duff, Sean B. Smith, Windy Bunn, Judy Rocchio, Eli Sarnat, John Alexander, Steve Jessup
Pattern detection in stream networks: Quantifying spatial variability in fish distribution
Biological and physical properties of rivers and streams are inherently difficult to sample and visualize at the resolution and extent necessary to detect fine-scale distributional patterns over large areas. Satellite imagery and broad-scale fish survey methods are effective for quantifying spatial variability in biological and physical variables over a range of scales in marine environments but a
Authors
Christian E. Torgersen, Robert E. Gresswell, Douglas S. Bateman
Geospatial techniques for developing a sampling frame of watersheds across a region
Current land-management decisions that affect the persistence of native salmonids are often influenced by studies of individual sites that are selected based on judgment and convenience. Although this approach is useful for some purposes, extrapolating results to areas that were not sampled is statistically inappropriate because the sampling design is usually biased. Therefore, in recent investiga
Authors
Robert E. Gresswell, Douglas S. Bateman, George Lienkaemper, T.J. Guy
Modeling demographic performance of northern spotted owls relative to forest habitat in Oregon
Northern spotted owls (Strix occidentalis caurina) are known to be associated with late-successional forests in the Pacific Northwest of the United States, but the effects of habitat on their demographic performance are relatively unknown. We developed statistical models relating owl survival and productivity to forest cover types within the Roseburg Study Area in the Oregon Coast Range of Oregon,
Authors
Gail S. Olson, Elizabeth M. Glenn, Robert G. Anthony, Eric D. Forsman, Janice A. Reid, Peter J. Loschl, William J. Ripple
Movements by juvenile and immature Steller's Sea Eagles Haliaeetus pelagicus tracked by satellite
Twenty-four juvenile Steller's Sea Eagles Haliaeetus pelagicus were tracked via satellite from natal areas in Magadan, Kabarovsk, Amur, Sakhalin and Kamchatka. Nestling dispersal occurred between 9 September and 6 December (n = 24), mostly 14 September-21 October, and did not differ among regions or years. Most eagles made stopovers of 4-28 days during migration. Migration occurred 9 September-18
Authors
M.J. McGrady, M. Ueta, E.R. Potapov, I. Utekhina, V. Marterov, A. Ladyguine, V. Zykov, J. Cibor, Mark R. Fuller, J.K. Seegar
Interactions of cattle grazing and climate change- hierarchical data analysis
No abstract available.
Authors
D. Clausnitzer, Manuela M. P. Huso, David A. Pyke, Jayne Belnap, T. B. Graham, R. L. Sanford, S. L. Phillips