Publications
Filter Total Items: 2002
Batrachochytrium dendrobatidis in Amphibian populations in Italy
[No abstract available]
Authors
M.J. Adams, S. Galvan, R. Scalera, C. Grieco, R. Sindaco
Space and habitat use by black bears in the Elwha valley prior to dam removal
Dam removal and subsequent restoration of salmon to the Elwha River is expected to cause a shift in nutrient dynamics within the watershed. To document how this influx of nutrients and energy may affect black bear (Ursus americanus) ecology, we used radio-telemetry to record movements of 11 male and two female black bears in the Elwha Valley from 2002-06. Our objective was to collect baseline data
Authors
K.A. Sager-Fradkin, K.J. Jenkins, P.J. Happe, J.J. Beecham, R. G. Wright, R.A. Hoffman
δ15N patterns of Douglas-fir and red alder riparian forests in the Oregon Coast Range
We used naturally occurring stable isotopes of N to compare N dynamics in near-stream and upslope environments along riparian catenas in N-fixing red alder (Alnus rubra) and Douglas-fir (Pseudotsuga menziesii) forests in the Coast Range of western Oregon. Based on the existing literature, we expected soil δ15N to be enriched closer to streams owing to inputs of isotopically heavy, marine-derived N
Authors
E.E. Scott, S.S. Perakis, D.E. Hibbs
Distribution and environmental limitations of an amphibian pathogen in the Rocky Mountains, USA
Amphibian populations continue to be imperiled by the chytrid fungus (Batrachochytrium dendrobatidis). Understanding where B. dendrobatidis (Bd) occurs and how it may be limited by environmental factors is critical to our ability to effectively conserve the amphibians affected by Bd. We sampled 1247 amphibians (boreal toads and surrogates) at 261 boreal toad (Bufo boreas) breeding sites (97 cluste
Authors
E. Muths, D. S. Pilliod, L.J. Livo
Demography and movement in a relocated population of Oregon Spotted Frogs (Rana pretiosa): Influence of season and gender
We used five years of recapture data and Bayesian estimation to assess seasonal survival, movement, and growth of Oregon Spotted Frogs (Rana pretiosa) relocated into created ponds at Dilman Meadow in Oregon, USA. We evaluate hypotheses specific to the relocation and elucidate aspects of R. pretiosa life history that are poorly known. The odds of survival of relocated individuals during the first y
Authors
N.D. Chelgren, C.A. Pearl, M.J. Adams, J. Bowerman
Analysis of trade-offs between threats of invasion by nonnative brook trout (Salvelinus fontinalis) and intentional isolation for native westslope cutthroat trout (Oncorhynchus clarkii lewisi)
Native salmonid fishes often face simultaneous threats from habitat fragmentation and invasion by nonnative trout species. Unfortunately, management actions to address one may create or exacerbate the other. A consistent decision process would include a systematic analysis of when and where intentional use or removal of barriers is the most appropriate action. We developed a Bayesian belief networ
Authors
D.P. Peterson, B.E. Rieman, J. B. Dunham, K.D. Fausch, M.K. Young
Predicting recolonization patterns and interactions between potamodromous and anadromous salmonids in response to dam removal in the Elwha River, Washington State, USA
The restoration of salmonids in the Elwha River following dam removal will cause interactions between anadromous and potamodromous forms as recolonization occurs in upstream and downstream directions. Anadromous salmonids are expected to recolonize historic habitats, and rainbow trout (Oncorhynchus mykiss) and bull trout (Salvelinus confluentus) isolated above the dams for 90 years are expected to
Authors
S.J. Brenkman, G.R. Pess, C.E. Torgersen, K.K. Kloehn, J.J. Duda, S.C. Corbett
Osprey distribution, abundance, reproductive success and contaminant burdens along lower Columbia River, 1997/1998 versus 2004
The osprey (Pandion haliaetus) population nesting along the lower portion of the Columbia River (river mile 29 to 286) increased from 94 in 1997 to 103 occupied nests in 1998 (9.6% annual rate of increase) to 225 occupied nests in 2004 (13.9% annual rate of increase). The more recent rate of population increase was associated with higher reproductive rates than in 1997/1998, and significantly lowe
Authors
C. J. Henny, R. A. Grove, J.L. Kaiser
Habitat, topographical, and geographical components structuring shrubsteppe bird communities
Landscapes available to birds to select for breeding locations are arrayed along multiple dimensions. Identifying the primary gradients structuring shrubsteppe bird communities in the western United States is important because widespread habitat loss and alteration are shifting the environmental template on which these birds depend. We integrated field habitat surveys, GIS coverages, and bird coun
Authors
S.T. Knick, J.T. Rotenberry, M. Leu
Growth, population structure, and reproduction of western pond turtles (Actinemys marmorata) on the central coast of California
We studied the population structure and growth of western pond turtles (Actinemys marmorata) at Vandenberg Air Force Base along the coast of central California in April 1995 and June 1996. We captured 179 individuals (115 males, 27 females) from 7 ponds during 26 days of trapping. Many turtles were adult-sized, but based on scute annuli, 74% were < 10 years of age, including many 2- to 3-year-olds
Authors
D.J. Germano, G. B. Rathbun
A soil burn severity index for understanding soil-fire relations in tropical forests
Methods for evaluating the impact of fires within tropical forests are needed as fires become more frequent and human populations and demands on forests increase. Short- and long-term fire effects on soils are determined by the prefire, fire, and postfire environments. We placed these components within a fire-disturbance continuum to guide our literature synthesis and develop an integrated soil bu
Authors
T.B. Jain, W.A. Gould, R.T. Graham, D. S. Pilliod, L.B. Lentile, G. Gonzalez
Western juniper and ponderosa pine ecotonal climate-growth relationships across landscape gradients in southern Oregon
Forecasts of climate change for the Pacific northwestern United States predict warmer temperatures, increased winter precipitation, and drier summers. Prediction of forest growth responses to these climate fluctuations requires identification of climatic variables limiting tree growth, particularly at limits of free species distributions. We addressed this problem at the pine-woodland ecotone usin
Authors
K.C. Knutson, D.A. Pyke