Publications
Filter Total Items: 1990
Quantifying and predicting fuels and the effects of reduction treatments along successional and invasion gradients in sagebrush habitats
Sagebrush shrubland ecosystems in the Great Basin are prime examples of how altered successional trajectories can create dynamic fuel conditions and, thus, increase uncertainty about fire risk and behavior. Although fire is a natural disturbance in sagebrush, post-fire environments are highly susceptible to conversion to an invasive grass-fire regime (often referred to as a “grass-fire cycle”). Af
Authors
Douglas J. Shinneman, David S. Pilliod, Robert Arkle, Nancy F. Glenn
Moving environmental DNA methods from concept to practice for monitoring aquatic macroorganisms
The discovery that macroorganisms can be detected from their environmental DNA (eDNA) in aquatic systems has immense potential for the conservation of biological diversity. This special issue contains 11 papers that review and advance the field of eDNA detection of vertebrates and other macroorganisms, including studies of eDNA production, transport, and degradation; sample collection and processi
Authors
Caren S. Goldberg, Katherine M. Strickler, David S. Pilliod
Mercury in birds of San Francisco Bay-Delta, California: trophic pathways, bioaccumulation, and ecotoxicological risk to avian reproduction
San Francisco Bay Estuary in northern California has a legacy of mercury contamination, which could reduce the health and reproductive success of waterbirds in the estuary. The goal of this study was to use an integrated field and laboratory approach to evaluate the risks of mercury exposure to birds in the estuary. We examined mercury bioaccumulation, and other contaminants of concern, in five wa
Authors
Joshua T. Ackerman, Collin A. Eagles-Smith, Gary Heinz, Susan E.W. De La Cruz, John Y. Takekawa, A. Keith Miles, Terrence L. Adelsbach, Mark P. Herzog, Jill D. Bluso-Demers, Scott A. Demers, Garth Herring, David J. Hoffman, Christopher A. Hartman, James J. Willacker, Thomas H. Suchanek, Steven E. Schwarzbach, Thomas C. Maurer
Temporal and spatial changes in golden eagle reproduction in relation to increased off highway vehicle activity
We used >40 years of data on golden eagles (Aquila chrysaetos) nesting in southwestern Idaho, USA, to assess whether the proportion of territories and pairs producing young has changed over time, and whether territories in areas where off highway vehicle (OHV) use has increased significantly were less likely to be productive than those in areas that continued to have little or no motorized recreat
Authors
Karen Steenhof, Jessi L. Brown, Michael N. Kochert
Conservation buffer distance estimates for Greater Sage-Grouse: a review
This report was prepared at the request of the U.S. Department of the Interior and is a compilation and summary of published scientific studies that evaluate the influence of anthropogenic activities and infrastructure on Greater Sage-Grouse(Centrocercus urophasianus; hereafter, sage-grouse) populations. The purpose of this report is to provide a convenient reference for land managers and others w
Authors
Daniel J. Manier, Zachary H. Bowen, Matthew L. Brooks, Michael L. Casazza, Peter S. Coates, Patricia A. Deibert, Steven E. Hanser, Douglas H. Johnson
Short-term occupancy and abundance dynamics of the Oregon spotted frog (Rana pretiosa) across its core range
The Oregon spotted frog (Rana pretiosa) occupies only a fraction of its original range and is listed as Threatened under the Endangered Species Act. We surveyed 93 sites in a rotating frame design (2010–13) in the Klamath and Deschutes Basins, Oregon, which encompass most of the species’ core extant range. Oregon spotted frogs are declining in abundance and probability of site occupancy. We did no
Authors
M. J. Adams, Christopher A. Pearl, Brome McCreary, Stephanie Galvan
Bull trout in the Boundary System: managing connectivity and the feasibility of a reintroduction in the lower Pend Oreille River, northeastern Washington
Many of the World’s rivers are influenced by large dams (>15 m high) most of which have fragmented formerly continuous habitats, and significantly altered fish passage, natural flow, temperature, and sediment fluxes (Nilsson and others, 2005; Arthington, 2012; Liermann and others, 2012). In the Pacific Northwest, dams on major rivers have been a major focus for fishery managers, primarily in regar
Authors
Jason B. Dunham, Eric B. Taylor, Fred W. Allendorf
Invasive crayfish as vectors of mercury in freshwater food webs of the Pacific Northwest
Invasive species are important drivers of environmental change in aquatic ecosystems and can alter habitat characteristics, community composition, and ecosystem energetics. Such changes have important implications for many ecosystem processes, including the bioaccumulation and biomagnification of contaminants through food webs. Mercury concentrations were measured in 2 nonnative and 1 native crayf
Authors
Branden L. Johnson, James J. Willacker, Collin A. Eagles-Smith, Christopher A. Pearl, M. J. Adams
Using mark-recapture distance sampling methods on line transect surveys
Mark–recapture distance sampling (MRDS) methods are widely used for density and abundance estimation when the conventional DS assumption of certain detection at distance zero fails, as they allow detection at distance zero to be estimated and incorporated into the overall probability of detection to better estimate density and abundance. However, incorporating MR data in DS models raises survey a
Authors
Louise M. Burt, David L. Borchers, Kurt J. Jenkins, Tigao A Marques
The spring migration of adult North American Ospreys
Most North American Ospreys (Pandion haliaetus) are migratory, breeding in northern latitudes and migrating long distances to and from their wintering grounds in the tropics. Although fall migration patterns of North American Ospreys have been described and studied, very little has been published about the spring migration of these birds. We used satellite telemetry to: (1) determine the character
Authors
Mark S. Martell, Richard O. Bierregaard, Brian E. Washburn, John E. Elliott, Charles J. Henny, Robert S. Kennedy, Iain MacLeod
Breeding site selection by coho salmon (Oncorhynchus kisutch) in relation to large wood additions and factors that influence reproductive success
The fitness of female Pacific salmon (Oncorhynchus spp.) with respect to breeding behavior can be partitioned into at least four fitness components: survival to reproduction, competition for breeding sites, success of egg incubation, and suitability of the local environment near breeding sites for early rearing of juveniles. We evaluated the relative influences of habitat features linked to these
Authors
Steven M. Clark, Jason B. Dunham, Jeffery R. McEnroe, Scott W. Lightcap
Rangewide climate vulnerability assessment for threatened Bull Trout
The bull trout, listed as threatened under the Endangered Species Act, is well adapted to the cold waters of the Northwest. Recent changes in climate have caused winter flooding and warmer summer water temperatures in the region, reducing the cold-water habitats that bull trout depend on. The southernmost bull trout populations, found in Oregon, Washington, Idaho, Montana, and Nevada, are currentl
Authors
Jason B. Dunham