Publications
Filter Total Items: 1995
Seasonal variation in concentrations of fiber, crude protein, and phenolic compounds in leaves of red alder (Alnus rubra): Nutritional implications for cervids
We sought to determine whether changes in chemical composition could be a factor in increased utilization of red alder (Alnus rubra) by the two cervids, the Columbian black-tailed deer (Odocoileus hemionus columbianus) and Roosevelt elk (Cervus elaphus roosevelti), during the fall in parts of the Douglas fir region of the Pacific Northwest. We found that concentrations and astringency of phenolic
Authors
M. P. Gonzalez-Hernandez, Edward E. Starkey, J. Karchesy
Fire frequency in the Interior Columbia River Basin: Building regional models from fire history data
Fire frequency affects vegetation composition and successional pathways; thus it is essential to understand fire regimes in order to manage natural resources at broad spatial scales. Fire history data are lacking for many regions for which fire management decisions are being made, so models are needed to estimate past fire frequency where local data are not yet available. We developed multiple reg
Authors
D. McKenzie, D. L. Peterson, James K. Agee
Growth and demographics of a population of Emydoidea blandingii from western Nebraska
No abstract available.
Authors
David J. Germano, R. Bruce Bury
Turnover and dispersal of prairie falcons in southwestern Idaho
We studied Prairie Falcon (Falco mexicanus) breeding dispersal, natal dispersal, and turnover
at nesting areas in the Snake River Birds of Prey National Conservation Area (NCA) from 1971-
95. Of 61 nesting areas where falcons identified one year were known to be present or absent the following year, 57% had a different falcon. This turnover rate was 2-3 times higher than that reported elsewhere
Authors
Robert N. Lehman, Karen Steenhof, L.B. Carpenter, Michael N. Kochert
Migration strategies and wintering areas of North American ospreys as revealed by satellite telemetry
Since 1995 we have trapped and tagged 110 Ospreys (Pandion haliaetus) from 12 study sites in 8 states (Fig. 1). This total includes 71 females, 32 males and 7 juveniles. Our study areas encompass the major Osprey population concentrations found in the United States including the Western States, the Great Lakes region and the Eastern Seaboard.Tagging of nesting pairs along with three complete famil
Authors
Mark S. Martell, Charles J. Henny, P. Nye, Matthew J. Solensky
Chlorophyll maxima in mountain ponds and lakes, Mount Rainier National Park, Washington State, USA
Hypolimnetic chlorophyll maxima are common in clear lakes and often occur at depths with between 1 and 0.1% of the surface incident light. Little is known, however, about the concentrations of chlorophyll in thermally unstratified mountain ponds and how these concentrations compare to epilimnetic and hypolimnetic concentrations in mountain lakes. The objectives of this study were to document the c
Authors
Gary L. Larson
Holocene climate in the western Great Lakes national parks and lakeshores: Implications for future climate change
We reconstruct Holocene climate history (last 10,000 years) for each of the U.S. National Park Service units in the western Great Lakes region in order to evaluate their sensitivity to global warming. Annual precipitation, annual temperature, and July and January temperatures were reconstructed by comparing fossil pollen in lake sediment with pollen in surface samples, assuming that ancient climat
Authors
Margaret Davis, Christine Douglas, K.L. Cole, Marge Winkler, Robyn Flaknes
Ecology and conservation of a rare, old-growth-associated canopy lichen in a silvicultural landscape
Nephroma occultum Wetm. is a rare, epiphytic lichen associated with old-growth forests of northwestern North America. We describe its distribution, abundance, and habitat within the managed landscape of a southwestern Oregon watershed. Because this species is found mainly in the canopy, we used direct canopy access (tree climbing) in combination with ground (litter) searches for our surveys. We re
Authors
A.L. Rosso, B. McCune, T. Rambo
Monitoring air quality in mountains: Designing an effective network
A quantitatively robust yet parsimonious air-quality monitoring network in mountainous regions requires special attention to relevant spatial and temporal scales of measurement and inference. The design of monitoring networks should focus on the objectives required by public agencies, namely: 1) determine if some threshold has been exceeded (e.g., for regulatory purposes), and 2) identify spatial
Authors
D. L. Peterson
Genetic variation in the endangered Southwestern Willow Flycatcher
The Southwestern Willow Flycatcher (Empidonax traillii extimus) is an endangered Neotropical migrant that breeds in isolated remnants of dense riparian habitat in the southwestern United States. We estimated genetic variation at 20 breeding sites of the Southwestern Willow Flycatcher (290 individuals) using 38 amplified fragment length polymorphisms (AFLPs). Our results suggest that considerable g
Authors
Joseph Busch, Mark P. Miller, E. H. Paxton, M. K. Sogge, Paul Keim
Day-roosts of female long-eared myotis in western Oregon
Roosts are a critical habitat component for bats and may influence their survival and fitness. We used radiotelemetry to investigate characteristics of day-roosts of female long-eared myotis (Myotis evotis) in watersheds characterized by different forest conditions and the spatial relationships between day-roosts and available water. We tracked 21 bats to 73 roosts (n = 102 occasions) from June to
Authors
David L. Waldien, J. P. Hayes, Edward B. Arnett
A late Holocene paleoecological record from Torrey Pines State Reserve, California
Paleoenvironments of the Torrey Pines State Reserve were reconstructed from a 3600-yr core from Los Peñasquitos Lagoon using fossil pollen, spores, charcoal, chemical stratigraphy, particle size, and magnetic susceptibility. Late Holocene sediments were radiocarbon dated, while the historical sediments were dated using sediment chemistry, fossil pollen, and historical records. At 3600 yr B.P., the
Authors
Kenneth L. Cole, Eugene Wahl