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Introduction
Jeff Keay retired from the United States Geological Survey. Jeff's most recent publication is 'Characteristics of a naturally regulated grizzly bear population'.
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Publications
Publications (10)
Knowledge of density-dependent responses in grizzly bears is largely circumstantial yet critical to managing populations near carrying capacity. We studied grizzly bear (Ursus arctos) body condition and demographics in Denali National Park, Alaska, USA, 1991–1998, and compared our results with data from a nearby heavily hunted population to better...
Changes in age-specific reproductive rates can have important implications for managing populations, but the number of female brown (grizzly) bears (Ursus arctos) observed in any one study is usually inadequate to quantify such patterns, especially for older females and in hunted areas. We examined patterns of reproductive maturation and senescence...
We present data from 4 studies of radiomarked brown bears (Ursus arctos) in Alaska to evaluate the effects of hunting and differential removal of males on cub survival and litter size. In the Susitna area in southcentral Alaska, the proportion of males declined during a period of increasing hunting pressure (1980-96). Cub survivorship was higher in...
Abstract: The dynamics and ecology of a naturally regulated grizzly bear population were studied in Denali National Park and Preserve, Alaska, from 1991 through 1998. Bears were captured by helicopter darting and fitted with radio-transmitters containing mortality sensors. Bears were located at least monthly during the non-denning period. Density w...
Bears consuming wild fruits for fall energy accumulation are constrained by several factors, including intake rate, the physiological capacity of the gastrointestinal tract, and the metabolic efficiency of gain in body mass. We measured these relationships through foraging and feeding trials using captive and wild black bears (Ursus americanus) and...
White-tailed deer (Odocoileus virginianus) preferred unburned Douglas-fir (Pseudotsuga menziesii)/ninebark (Physocarpus malvaceus) habitat types in winter, except during February, when the unburned bluebunch wheatgrass (Agropyron spicatum)/bluegrass (Poa sandbergii) habitat type was preferred. Mule deer (O. hemionus) preferred burned Douglas-fir/ni...
