Dynamics of a hunted brown bear population at Black Lake, Alaska : a cooperative interagency study, third annual progress report, 1990
Sellers RA and Miller SD. 1991. Dynamics of a hunted brown bear population at Black Lake, Alaska : a cooperative interagency study, third annual progress report, 1990. State of Alaska, Alaska Department of Fish and Game, Division of Wildlife Conservation. King Salmon, AK
This report presents the results obtained duing the third year of an interagency study of the dynamics, including population density and structure, of a hunted brown bear population near Black Lake on the Alaskan Peninsula. Several of the original objectives of this study, including the density estimate and description of the current population compostion have been completed and previously reported. The number of bears captured in this study by year was 59, 40 and 5 in 1988, 1989, and 1990 respectively. In total, 63 radio collars, including 22 with break away features, and 19 glue on radios were deployed. Based on the percentage of marked bears killed and on the total harvest from a 1531 sq mile area around Black Lake where the bear population estimates were made by extrapolation from the Black Lake study area to the rest of the GMU 9. These estimates are especially questionable for the northern half of GMU9. In subunits 9E and 9D, the population was estimated to be 4100. The 1989-90 harvest from these 2 subunits was 457 bears. These values provided a 5.6% annual exploitaton rate estimate. Because harvests were increasing steadily, the fall 1991 season was reduced by 6 days. Preliminary survival rates for COY, yearling, female =>3 and males =>3 were calculated to 0.48, 0.84, 0.87 and 0.85, respectively. Over 1200 relocations have been recorded, and 28 bears all females except one, with functioning radio collars entered dens in 1990. Five replicated stream surveys were conducted during 3-7 August, and an average of 185 bears were seen per survey.
- Type
- Published Report
- Authors
- Sellers, Richard; Miller, Sterling
- Date of Issue
- 1991-03
- Publisher
- State of Alaska, Alaska Department of Fish and Game, Division of Wildlife Conservation
- Units
- KATM
- Keywords
- brown bear survey, Composition, Katmai National Park And Preserve, Population Dynamics, Survival Rates