Mission Areas

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Filter Total Items: 3,081
Year Published: 1997

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...

Marzluff, J.M.; Kimsey, Bryan A.; Schueck, Linda S.; McFadzen, Mary E.; Vekasy, M.S.; Bednarz, James C.
The influence of habitat, prey abundance, sex, and breeding success on the ranging behavior of Prairie Falcons; 1997; Article; Journal; The Condor; Marzluff, J. M.; Kimsey, Bryan A.; Schueck, Linda S.; McFadzen, Mary E.; Vekasy, M. S.; Bednarz, James C.

Year Published: 1997

Use of artificially created douglas-fir snags by cavity-nesting birds

In western Oregon, we created snags by sawing tops off live Douglas-fir (Pseudotsuga menziesii) (n = 821) trees and monitored their condition and use by cavity-nesting birds. We created snags in three silvicultural treatments: modified clearcut stands, two-story stands, and small-patch group-selection stands. We used two snag patterns: clumped and...

Chambers, C.L.; Carrigan, T.; Sabin, T.E.; Tappeiner, J. C.; McComb, W.C.
Use of artificially created douglas-fir snags by cavity-nesting birds; 1997; Article; Journal; Western Journal of Applied Forestry; Chambers, C. L.; Carrigan, T.; Sabin, T. E.; Tappeiner, J. C., II; McComb, W. C.

Year Published: 1997

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...

Van Horne, Beatrice; Schooley, Robert L.; Knick, Steven T.; Olson, G.S.; Burnham, K.P.
Use of burrow entrances to indicate densities of Townsend's ground squirrels; 1997; Article; Journal; Journal of Wildlife Management; Van Horne, Beatrice; Schooley, R. L.; Knick, Steven T.; Olson, G. S.; Burnham, K. P.

Year Published: 1997

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...

Mattson, D.J.
Use of lodgepole pine cover types by Yellowstone grizzly bears; 1997; Article; Journal; Journal of Wildlife Management; Mattson, D. J.

Year Published: 1997

Use of ungulates by Yellowstone grizzly bears Ursus arctos

Previous results of fecal analysis from the Yellowstone area and the known abilities of grizzly bears Ursus arctos to acquire and digest tissue from vertebrates suggested that grizzlies in this ecosystem obtained substantial energy from ungulates. This issue was addressed using observations from radio-marked grizzly bears, 1977a??1992. Ungulates...

Mattson, D.J.
Use of ungulates by Yellowstone grizzly bears Ursus arctos; 1997; Article; Journal; Biological Conservation; Mattson, D. J.

Year Published: 1997

Using mark-recapture methods to estimate fish abundance in small mountain lakes

The majority of lacustrine fish populations in the western USA are located far from the nearest road. Although mark-recapture techniques are widely accepted for estimating population abundance, these techniques have been broadly ignored for fisheries surveys in remote mountain lakes because of restricted access and associated logistical...

Gresswell, Robert E.; Liss, W.J.; Lomnicky, G.A.; Deimling, E.; Hoffman, Robert L.; Tyler, T.
Using mark-recapture methods to estimate fish abundance in small mountain lakes; 1997; Article; Journal; Northwest Science; Gresswell, Robert E.; Liss, W. J.; Lomnicky, G. A.; Deimling, E.; Hoffman, Robert L.; Tyler, T.

Year Published: 1997

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...

Fuller, Todd K.; Fuller, Mark R.; DeGraaf, R.M.
Why do international research and management?; 1997; Article; Journal; Wildlife Society Bulletin; Fuller, Todd K.; Fuller, Mark R.; DeGraaf, R. M.

Year Published: 1997

Wilderness-dependent wildlife: The large and carnivorous

Wilderness is vital to the conservation of wildlife species that are prone to conflict with humans and vulnerable to human-caused mortality. These species tend to be large and are often carnivorous. Such animals are typically problematic for humans because they kill livestock and, occasionally, humans, and cause inordinate damage to crops. The...

Mattson, David J.
Wilderness-dependent wildlife: The large and carnivorous; 1997; Article; Journal; International Journal of Wilderness; Mattson, D. J.

Year Published: 1997

Wildlife response to thinning young forests in the Pacific Northwest

No abstract available.

Hayes, J.P.; Chan, S.S.; Emmingham, W.H.; Tappeiner, J. C.; Kellogg, L.D.; Bailey, J. D.

Year Published: 1996

Amphibian and reptile abundance in riparian and upslope areas of five forest types in western Oregon

We compared species composition and relative abundance of herpetofauna between riparian and upslope habitats among 5 forest types (shrub, open sapling-pole, large sawtimber and old-growth conifer forests, and deciduous forests) in Western Oregon. Riparian- and upslope- associated species were identified based on capture frequencies from pitfall...

Gomez, D.M.; Anthony, R.G.
Amphibian and reptile abundance in riparian and upslope areas of five forest types in western Oregon; 1996; Article; Journal; Northwest Science; Gomez, D. M.; Anthony, R. G.