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The grizzly bear distribution represents the estimated geographic extent of occupied range of the Yellowstone grizzly bear population. The images show a comparison of their estimated geographic extent, with a 3-fold increase from 1990 (23,361 km2 or 9,020 mi2) to 2022 (70,101 km2 or 27,066 mi2). The distribution boundary was delineated to provide reliable estimates of grizzly bear occupancy through time and for use as a monitoring tool for federal, state, and Tribal natural resource managers.
Literature cited:
Bjornlie, D.D., Thompson, D.J., Haroldson, M.A., Schwartz, C.C., Gunther, K.A. Cain, S.L., Tyers, D.B., Frey, K.L., and Aber, B., 2014, Methods to estimate distribution and range extent of grizzly bears in the Greater Yellowstone Ecosystem: Wildlife Society Bulletin, v: 38, p: 182–187.
Dellinger, J.A., Karabensh, B.E., and Haroldson, M.A.,2023, Grizzly Bear Occupied Range in the Greater Yellowstone Ecosystem, 2008–2022. in van Manen, F.T., Haroldson, M.A., and Karabensh, B.E., eds., Yellowstone grizzly bear investigations: annual report of the Interagency Grizzly Bear Study Team, 2022. U.S. Geological Survey, Bozeman, Montana, USA, p. 22–24.
Interagency Grizzly Bear Study Team (IGBST), 2023, Occupied Range of the Yellowstone Grizzly Bear 2008-2022: U.S. Geological Survey data release, https://doi.org/10.5066/P9RLJ1E6.
Public Domain.
Sequential estimates of occupied ranges for grizzly bears in the Greater Yellowstone Ecosystem during 1990–2022 (Dellinger et al. 2023). Range extents are based on methods described in Bjornlie et al. (2014).
Sequential estimates of occupied ranges for grizzly bears in the Greater Yellowstone Ecosystem during 1990–2022 (Dellinger et al. 2023). Range extents are based on methods described in Bjornlie et al. (2014).
Sequential estimates of occupied ranges for grizzly bears in the Greater Yellowstone Ecosystem during 1990–2022 (Dellinger et al. 2023). Range extents are based on methods described in Bjornlie et al. (2014).
Sequential estimates of occupied ranges for grizzly bears in the Greater Yellowstone Ecosystem during 1990–2022 (Dellinger et al. 2023). Range extents are based on methods described in Bjornlie et al. (2014).
