Publications
Filter Total Items: 2069
Ecological risk analysis of a piscivorous fish introduction into the Yellowstone Lake ecosystem Ecological risk analysis of a piscivorous fish introduction into the Yellowstone Lake ecosystem
No abstract available.
Authors
Robert E. Greswell, H. Li
Shaping stand development through silvicultural practices Shaping stand development through silvicultural practices
No abstract available.
Authors
D.S. DeBell, Robert O. Curtis, C. Harrington, J. C. Tappeiner
Impacts of trampling soils in southeast Utah ecosystems Impacts of trampling soils in southeast Utah ecosystems
No abstract available.
Authors
Jayne Belnap
A resource in crisis: Changing the measure of salmon management A resource in crisis: Changing the measure of salmon management
No abstract available.
Authors
C.A. Frissell, W.J. Liss, R. E. Gresswell, R.K. Nawa
Alternative silvicultural approaches to timber harvesting: Variable retention harvest systems Alternative silvicultural approaches to timber harvesting: Variable retention harvest systems
No abstract available.
Authors
J.F. Franklin, D.F. Berg, D. Thornburg, J. C. Tappeiner
Perception of neighboring plants by rhizomes and roots: Morphological manifestations of a clonal plant Perception of neighboring plants by rhizomes and roots: Morphological manifestations of a clonal plant
A previous study showed that clonal morphology of the rhizomatous grass Elymus lanceolatus ssp. lanceolatus (Scibner & J.G. Smith Gould) was influenced more by neighbouring root systems than by the local distribution of nutrients. In this study we determine whether individual rhizomes or roots of E. lanceolatus perceive neighbouring root systems and how this is manifested in...
Authors
Elisabeth Huber-Sannwald, M. M. Caldwell, David A. Pyke
Field studies on pesticides and birds: Unexpected and unique relations Field studies on pesticides and birds: Unexpected and unique relations
We review the advantages and disadvantages of experimental and field studies for determining effects of pesticides on birds. Important problems or principles initially discovered in the field include effects of DDT (through its metabolite DDE) on eggshell thickness, reproductive success, and population stability; trophic-level bioaccumulation of the lipid-soluble organochlorine...
Authors
Lawrence J. Blus, Charles J. Henny
Spring feeding on ungulate carcasses by grizzly bears in Yellowstone National Park Spring feeding on ungulate carcasses by grizzly bears in Yellowstone National Park
We studied the spring use of ungulate carcasses by grizzly bears (Ursus arctos horribilis) on ungulate winter ranges in Yellowstone National Park. We observed carcasses and bear tracks on survey routes that were travelled biweekly during spring of 1985-90 in the Firehole-Gibbon winter range and spring of 1987-90 in the Northern winter range. The probability that grizzly bears used a...
Authors
Gerald I. Green, David J. Mattson, James M. Peek
Landscape characteristics of disturbed shrubsteppe habitats in southwestern Idaho (USA) Landscape characteristics of disturbed shrubsteppe habitats in southwestern Idaho (USA)
We compared 5 zones in shrubsteppe habitats of southwestern Idaho to determine the effect of differing disturbance combinations on landscapes that once shared historically similar disturbance regimes. The primary consequence of agriculture, wildfires, and extensive fires ignited by the military during training activities was loss of native shrubs from the landscape. Agriculture created...
Authors
Steven T. Knick, J.T. Rotenberry
Statistical power analysis in wildlife research Statistical power analysis in wildlife research
Statistical power analysis can be used to increase the efficiency of research efforts and to clarify research results. Power analysis is most valuable in the design or planning phases of research efforts. Such prospective (a priori) power analyses can be used to guide research design and to estimate the number of samples necessary to achieve a high probability of detecting biologically...
Authors
Robert J. Steidl, John P. Hayes, Eric Schauber
Use of lodgepole pine cover types by Yellowstone grizzly bears Use of lodgepole pine cover types by Yellowstone grizzly bears
Lodgepole pine (Pinus contorta) forests are a large and dynamic part of grizzly bear (Ursus arctos) habitat in the Yellowstone ecosystem. Research in other areas suggests that grizzly bears select for young open forest stands, especially for grazing and feeding on berries. Management guidelines accordingly recommend timber harvest as a technique for improving habitat in areas potentially...
Authors
David J. Mattson
Characteristics of nesting areas used by San Clemente Island Sage Sparrows Characteristics of nesting areas used by San Clemente Island Sage Sparrows
I examined the nest habitat used by Sage Sparrows (Amphispiza belli clementeae) on San Clemente Island, one of the California Channel Islands, during March through June 1986. All nests were found in boxthorn shrubs in coastal scrub habitat. The cover of vegetation was greater and more evenly distributed at nest sites than in surrounding habitat. Nests were placed most often on the...
Authors
David W. Willey