Publications
Filter Total Items: 1994
Interactions among livestock grazing, vegetation type, and fire behavior in the Murphy Wildland Fire Complex in Idaho and Nevada, July 2007
A series of wildland fires were ignited by lightning in sagebrush and grassland communities near the Idaho-Nevada border southwest of Twin Falls, Idaho in July 2007. The fires burned for over two weeks and encompassed more than 650,000 acres. A team of scientists, habitat specialists, and land managers was called together by Tom Dyer, Idaho BLM State Director, to examine initial information from t
Authors
Karen Launchbaugh, Bob Brammer, Matthew L. Brooks, Stephen C. Bunting, Patrick Clark, Jay Davison, Mark Fleming, Ron Kay, Mike Pellant, David A. Pyke
Landscape Features Shape Genetic Structure in Threatened Northern Spotted Owls
Several recent studies have shown that landscape features can strongly affect spatial patterns of gene flow and genetic variation. Understanding landscape effects on genetic variation is important in conservation for defining management units and understanding movement patterns. The landscape may have little effect on gene flow, however, in highly mobile species such as birds. We tested for geneti
Authors
W. Chris Funk, Eric D. Forsman, Thomas D. Mullins, Susan M. Haig
Genetics Show Current Decline and Pleistocene Expansion in Northern Spotted Owls
The northern spotted owl (Strix occidentalis caurina) is one of the most controversial threatened subspecies ever listed under the U.S. Endangered Species Act. Because of concern for persistence of the subspecies, logging on Federal lands in the U.S. Pacific Northwest was dramatically reduced under the Northwest Forest Plan in 1994. Despite protection of its remaining forest habitat, recent field
Authors
W. Chris Funk, Eric D. Forsman, Thomas D. Mullins, Susan M. Haig
Use of body mass, footpad length, and wing chord to determine sex in Swainson's Hawks
Many studies of avian ecology require an expedient means to determine sex, and the use of molecular techniques has provided an effective and accurate means to determine sex of raptors in the field (Sarasola and Negro 2004, Donohue and Dufty 2006). Sometimes investigators need to rely on morphometric measurements to determine sex of monochromatic species such as Swainson's Hawks (Buteo swainsoni) b
Authors
Michael N. Kochert, James O. McKinley
NCCN Mountain Lakes Monitoring Strategy: Guidelines to Resolution
The North Coast and Cascades Network (NCCN) Inventory and Monitoring Program provides funds to its Network Parks to plan and implement the goals and objectives of the National Park Services? (NPS) Inventory and Monitoring (I&M) Program. The primary purpose of the I&M program is to develop and implement a long-term monitoring program in each network. The purpose of this document is to describe the
Authors
Robert L. Hoffman, Mark H. Huff
Influences of body size and environmental factors on autumn downstream migration of bull trout in the Boise River, Idaho
Many fishes migrate extensively through stream networks, yet patterns are commonly described only in terms of the origin and destination of migration (e.g., between natal and feeding habitats). To better understand patterns of migration in bull trout,Salvelinus confluentus we studied the influences of body size (total length [TL]) and environmental factors (stream temperature and discharge) on mig
Authors
L. Monnot, J. B. Dunham, T. Hoem, P. Koetsier
Defoliation effects on Bromus tectorum seed production: Implications for grazing
Cheatgrass (Bromus tectorum L.) is an invasive annual grass that creates near-homogenous stands in areas throughout the Intermountain sagebrush steppe and challenges successful native plant restoration in these areas. A clipping experiment carried out at two cheatgrass-dominated sites in eastern Oregon (Lincoln Bench and Succor Creek) evaluated defoliation as a potential control method for cheatgr
Authors
K. Hempy-Mayer, D.A. Pyke
Baseline studies in the Elwha River ecosystem prior to dam removal: Introduction to the special issue
The planned removal of two dams that have been in place for over 95 years on the Elwha River provides a unique opportunity to study dam removal effects. Among the largest dams ever considered for removal, this project is compelling because 83% of the watershed lies undisturbed in Olympic National Park. Eighteen million cubic meters of sediment have accumulated in and will be released from the rese
Authors
Jeffrey J. Duda, Jerry Freilich, Edward G. Schreiner
Range-wide patterns of greater sage-grouse persistence
Aim: Greater sage-grouse (Centrocercus urophasianus), a shrub-steppe obligate species of western North America, currently occupies only half its historical range. Here we examine how broad-scale, long-term trends in landscape condition have affected range contraction. Location: Sagebrush biome of the western USA. Methods: Logistic regression was used to assess persistence and extirpation of greate
Authors
Cameron L. Aldridge, Scott E. Nielsen, Hawthorne L. Beyer, Mark S. Boyce, John W. Connelly, Steven T. Knick, Michael A. Schroeder
Mercury and drought along the lower Carson River, Nevada: II. Snowy egret and black-crowned night-heron reproduction on Lahontan Reservoir, 1997-2006
Mercury concentrations in the floodplain of the Carson River Basin in northwestern Nevada are some of the highest ever reported in a natural system. Thus, a portion of the basin including Lahontan Reservoir was placed on the U.S. Environmental Protection Agency’s Natural Priorities List for research and cleanup. Preliminary studies indicated that reproduction in piscivorous birds may be at risk. T
Authors
Elwood F. Hill, Charles J. Henry, Robert A. Grove
The human footprint in the west: a large-scale analysis of anthropogenic impacts.
Anthropogenic features such as urbanization, roads, and power lines, are increasing in western United States landscapes in response to rapidly growing human populations. However, their spatial effects have not been evaluated. Our goal was to model the human footprint across the western United States. We first delineated the actual area occupied by anthropogenic features, the physical effect area.
Authors
M. Leu, S.E. Hanser, S.T. Knick
Prey of nesting ospreys on the Willamette and Columbia Rivers, Oregon and Washington
To more effectively use ospreys as a biomonitoring tool and to better assess contaminant pathways, the diet of nesting ospreys (Pandion haliaetus) was studied along the lower Columbia and upper mainstem Willamette rivers by evaluating prey remains collected from wire baskets constructed under artificial feeding perches installed near nest sites and from the ground beneath natural feeding perches a
Authors
B. L. Johnson, J.L. Kaiser, C. J. Henny, R. A. Grove