A Possible Link between Yellowstone and Glacier Grizzly Bear Populations

January 1, 1986

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Grizzly bears (Ursus arctos horribilis) have been observed in 5 of the 7 mountain areas that link the Northern Continental Divide (Glacier Park) and Yellowstone ecosystem grizzly bear populations in Montana. Thus these 2 populations, recognized by the Grizzly Bear Recovery Plan (U.S. Dep. Int. 1981) are possibly linked by a filter bridge. Portions of this bridge are not included in the Grizzly Bear Recovery Plan. Current data is analyzed to make specific estimates of the population potential of the bridge units. Each unit is evaluated with respect to extinction time, migration, and potential as a viable bridge link using methods based upon biogeographic theory. This analysis suggests that these scattered observations should not be routinely classed as accidental and ignored as is currently the case.

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