Publications
Filter Total Items: 1994
A plan to assess native and exotic plant diversity and cryptobiotic crusts in the Grand Staircase-Escalante National Monument
No abstract available.
Authors
Thomas J. Stohlgren, Jayne Belnap, G.W. Chong, R.M. Reich
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 morphological response
Authors
Elisabeth Huber-Sannwald, M. M. Caldwell, David A. Pyke
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 pesticides; indirec
Authors
Lawrence J. Blus, Charles J. Henny
Introduction to ecology and management of potamodromous salmonids
No abstract available.
Authors
R. E. Gresswell
Supervised classification of Landsat thematic mapper imagery in a semi-arid rangeland by nonparametric discriminant analysis
In this article the authors used a nonparametric discriminant function in a supervised classification of Landsat Thematic Mapper satellite imagery of a ~240,000-ha semi-arid region in the Snake River Plains, southwestern Idaho. First, agriculture pixels were classified by distance from the soil baseline and water pixels by the thermal band value. Next, successive nonparametric discriminant functio
Authors
Steven T. Knick, J.T. Rotenberry, T.J. Zarriello
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 carcass was po
Authors
Gerald I. Green, D.J. Mattson, J.M. Peek
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 significant
Authors
R.J. Steidl, J. P. Hayes
The influence of habitat, prey abundance, sex, and breeding success on the ranging behavior of Prairie Falcons
We studied the ranging behavior and habitat selection of radio-tagged Prairie Falcons (Falco mexicanus) during the breeding season in southwestern Idaho. The distribution and numbers of Townsend's ground squirrels (Spermophilus townsendii), the primary prey of Prairie Falcons in our study area, varied in response to drought during the study period. Prairie Falcons ranged over large areas (ca. 300
Authors
J.M. Marzluff, Bryan A. Kimsey, Linda S. Schueck, Mary E. McFadzen, M.S. Vekasy, James C. Bednarz
Mixed-density designs for evaluating plant interactions during revegetation
No abstract available.
Authors
Mark G. Francis, David A. Pyke
Why do international research and management?
The pheasant, in its North American range, seems to have had its greatest success in glaciated or in other areas associated with calcareous soils. Success has been slight in areas deficient in calcium.....In Lancaster County, Pennsylvania, no environmental difference other than presence or absence of limestone was discovered that might explain the high population in the limestone valley and the sc
Authors
Todd K. Fuller, Mark R. Fuller, R.M. DeGraaf
Use of burrow entrances to indicate densities of Townsend's ground squirrels
Counts of burrow entrances have been positively correlated with densities of semi-fossorial rodents and used as an index of densities. We evaluated their effectiveness in indexing densities of Townsend's ground squirrels (Spermophilus townsendii) in the Snake River Birds of Prey National Conservation Area (SRBOPNCA), Idaho, by comparing burrow entrance densities to densities of ground squirrels es
Authors
Beatrice Van Horne, Robert L. Schooley, Steven T. Knick, G.S. Olson, K.P. Burnham
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 large squar
Authors
Steven T. Knick, J.T. Rotenberry