News of the WeekConservation Biology

Study Sounds Alarm on Yellowstone Grizzlies

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Science  23 Apr 1999:
Vol. 284, Issue 5414, pp. 568
DOI: 10.1126/science.284.5414.568a

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In June, the Department of Interior intends to release a strategy for managing Yellowstone National Park's grizzly bears following their eventual removal from the threatened species list. But a new study suggests that the government's victory declaration may be premature. Using a new model of population dynamics based on field data, a pair of researchers estimates that Yellowstone grizzly numbers grew only about 1% a year from 1975 to 1995--much lower than the 5% annual rise over the last decade claimed by Interior.