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Page 4867, results 121651 - 121675

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Using climate data to predict grizzly bear litter size
Harold D. Picton, Richard R. Knight
1986, Bears: Their Biology and Management (6) 41-44
A 5-year double-bind test was conducted to test the predictive capability of a previously published (Picton 1978) regression (Y= 2.01 + 0.042x), which described the relationship between the littler size of grizzly bears (Ursus arctos horribilis) and an index of climate plus carrion availability (climate-carrion index). This regression showed...
Comparison of capture-recapture and visual count indices of prairie dog densities in black-footed ferret habitat
Kathleen A. Fagerstone, Dean E. Biggins
1986, Great Basin Naturalist Memoirs (8) 94-98
Black-footed ferrets (Mustela nigripes) are dependent on prairie dogs (Cynomys spp.) for food and on their burrows for shelter and rearing young. A stable prairie dog population may therefore be the most important factor determining the survival of ferrets. A rapid method of determining prairie dog density would be useful...
Long-term on-site and off-site effects of logging and erosion in the Redwood Creek basin, northern California
Danny K. Hagans, William E. Weaver, Mary Ann Madej
1986, Book, American Geophysical Union Meeting on Cumulative Effects
For nearly 15 years, the Redwood Creek Watershed in north coastal California has been the focus of both U.S. Geological Survey (USGS) and National Park Service (NPS) studies designed to document and quantify the nature of erosion, sedimentation and sediment transport processes active in the basin. While none of...
Activity of radio-tagged black-footed ferrets
Dean E. Biggins, Max H. Shroeder, Steven C. Forrest, Louise Richardson
1986, Great Basin Naturalist Memoirs (8) 135-140
Activity of two radio-tagged black-footed ferrets (Mustela nigripes) was investigated during October-November 1981 (an adult male monitored for 16 days), and during August-November 1982 (a young female monitored for 101 days). Aboveground activity of the male averaged 2.95 hr/night, 15% of the total time monitored. From 22 September to 5...
Denning of grizzly bears in the Yellowstone National Park area
Steven L. Judd, Richard R. Knight, Bonnie M. Blanchard
1986, Bears: Their Biology and Management (6) 111-117
Radiotelemetry was used to locate 101 grizzly bear (Ursus arctos) dens from 1975 to 1980; 35 dens were examined on the ground. Pregnant females denned in late October, and most other bears denned by mid-November. Duration of denning average 113, 132, and 170 days for males, females, and...