Last week I attended the biannual meeting of the Yellowstone Ecosystem Subcommittee (YES) of the Interagency Grizzly Bear Committee. YES is composed primarily of representatives from federal and state agencies charged with grizzly bear recovery and management. This was a pivotal meeting, as the Interagency Grizzly Bear Study Team revealed results of its long-awaited analysis of grizzly bear foods. The Study Team began the analysis nearly two years ago, after a court ruled that the U.S. Fish and Wildlife Service (USFWS) had not adequately justified its conclusion that the steep decline of whitebark pine throughout the Yellowstone ecosystem would not adversely affect the survival of the grizzly bear, when the agency removed the Yellowstone grizzly from the Endangered Species List.
Over the past 18 months, the Study Team has conducted research to determine what foods grizzlies may be substituting for whitebark pine seeds and cutthroat trout (two of four major grizzly foods rich in protein that have steeply declined in the past decade) and how the bears are faring. A key question is whether those alternative foods pack the same kind of calories and nutrition that the bears need to maintain healthy reproductive and survival rates. The Study Team's preliminary conclusions are that grizzlies are finding comparable foods and that the leveling off of the growth rate over the past decade is not so much due to the decline of whitebark pine but because we've reached the carrying capacity of the ecosystem for grizzly bears. Based on these preliminary findings, federal agencies are gearing up to again propose removing federal protections from Yellowstone grizzly bears.