Publications
Filter Total Items: 1999
Values associated with management of Yellowstone cutthroat trout in Yellowstone National Park
Recent emphasis on a holistic view of natural systems and their management is associated with a growing appreciation of the role of human values in these systems. In the past, resource management has been perceived as a dichotomy between extraction (harvest) and nonconsumptive use, but this appears to be an oversimplified view of natural-cultural systems. The recreational fishery for Yellowstone c
Authors
Robert E. Gresswell, W.J. Liss
Vine maple clone growth and reproduction in managed and unmanaged coastal Oregon Douglas-fir forests
Vine maple (Acer circinatum Pursh.) clone development, expansion, and regeneration by seedling establishment were studied in 5-240 yr old managed and unmanaged Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) stands in coastal Oregon. Stem length, number of stems, and crown area were all significantly (P ≤ 0.01) related to stand age, and clone development was most rapid during the first 50 yr of
Authors
Mary E. O'Dea, John C. Zasada, John C. Tappeiner
Have desert tortoises (Gopherus agassizii) undergone a long-term decline in abundance?
No abstract available.
Authors
R. Bruce Bury, P. S. Corn
Alien species in national parks: Drawing lines in space and time
No abstract available.
Authors
D. Houston, Edward G. Schreiner
Ebb and flow of encroachment by nonnative rainbow trout in a small stream in the southern Appalachian Mountains
Brook trout Salvelinus fontinalis is the native salmonid species of streams in the southern Appalachian Mountains. The present distribution of this species, once widespread from headwaters to lower reaches of large streams, is restricted to mostly headwater areas. Changes in the distribution of native brook trout in the presence of' nonnative rainbow trout Oncorhynchus mykiss have been documented
Authors
Gary L. Larson, S. E. Moore
Climate, geography, and tree establishment in subalpine meadows of the Olympic Mountains, Washington, USA
Noticeable changes in vegetation distribution have occurred in the Pacific Northwest during the last century as trees have established in some subalpine meadows. To study the relationship of this process to climate, recently established trees were aged in six subalpine meadows in the Olympic Mountains, Washington. The sites represent three points along a steep precipitation gradient. Subalpine fir
Authors
Andrea Woodward, Edward G. Schreiner, D.G. Silsbee
Past and current trends of change in a dune prairie/oak savanna reconstructed through a multiple-scale history
The history of a rapidly changing mosaic of prairie and oak savanna in northern Indiana was reconstructed using several methods emphasizing different time scales ranging from annual to millennial. Vegetation change was monitored for 8 yr using plots and for 30 yr using aerial photographs. A 20th century fire history was reconstructed from the stand structure of multiple-stemmed trees and fire scar
Authors
K.L. Cole, R.S. Taylor
Population diversity with special reference to rangeland plants
No abstract available.
Authors
David A. Pyke
Effects of hydrology on zooplankton communities in high-mountain ponds, Mount Rainier National Park, USA
Ten high-mountain ponds in Mount Rainier National Park, Washington State, were studied from ice-out in June through September1992 to investigate the influences of fluctuating pond volumes on zooplankton communities. All of the ponds were at maximum volume immediately after ice-out. The temporary pond with the shortest wet phase was inhabited by rotifer taxa with short generation times and a crusta
Authors
Scott Girdner, Gary L. Larson
Characteristics of mineral licks used by white-tailed deer (Odocoileus virginianus)
Characteristics of mineral licks used by white-tailed deer (Odocoileus virginianus) were examined in the northern Black Hills of South Dakota in May 1992. Concentrations of sodium, nitrogen, phosphorus, potassium, calcium, chloride and magnesium, and soil texture, organic matter and pH for licks and nonlick soils were compared. Black Hills lick and nonlick samples also were compared to 67 other No
Authors
John F. Kennedy, Jonathan A. Jenks, Robert L. Jones, Kurt J. Jenkins
A comparison of avian hematozoan epizootiology in two California coastal scrub communities
Passerine birds within two California (USA) coastal scrub ecosystems, an island and a mainland site, were examined for hematozoa from 1984 to 1990. Island birds had a significantly lower hematozoan prevalence than mainland birds. This prevalence difference can be related to a lack of appropriate hematozoan vectors on the island. Haemoproteus spp. and Leucocytozoon spp. were the most commonly encou
Authors
Paul E. Super, Charles van Riper
What we know and don't know about amphibian declines in the West
The problem of declining amphibian species is thought to be particularly acute in western North America, but there are many gaps in our knowledge. Although several declines have been well-documented, other declines are anecdotal or hypothesized. Most documented declines are of ranid frogs or toads (Bufo). Species from montane habitats and those occurring in California have been best studied. Statu
Authors
Paul Stephen Corn