Information from these studies is crucial to evaluate trends in the grizzly bear population and assess the long-term health of the population. Sustainable mortality establishes a limit on the number of grizzly deaths that can occur given population objectives. Estimates of total population size are used by IGBST to evaluate annual mortality and to assess whether mortality is sustainable. When combined with other data, these estimates serve as the basis for estimating total population size. During the past 10 years (2006-2015), IGBST has estimated an average of 56 unique females with cubs annually. Efforts by IGBST to document the abundance and distribution of females with cubs began in 1973 and have improved over time by implementing standardized protocols and new statistical procedures. Thus, if we observe growth in numbers of female with cubs, we can be reasonably sure the entire population is growing. Tracking trend for this segment of the population is generally representative of the trend for entire population. Consequently females with cubs are a major focus of IGBST’s monitoring program in the Greater Yellowstone Ecosystem (GYE). ![]() Adult females with cubs-of-the-year (cubs) are the most easily and reliably recognized cohort of grizzly bear populations. The IGBST Leader serves as a technical and science advisor to the Interagency Grizzly Bear Committee and its Yellowstone Ecosystem Subcommittee, but is not a voting member of the committees.Īdult females are the most important demographic segment of the grizzly bear populations because they are the reproductive engine. This interagency approach ensures consistency in data collection and allows for combining limited resources to address information needs throughout the GYE. Forest Service, the Eastern Shoshone and Northern Arapaho Tribal Fish and Game Department, and the States of Idaho, Montana, and Wyoming. Geological Survey, National Park Service, U.S. ![]() IGBST members are representatives from the U.S. The team was formed by the Department of the Interior (DOI) in 1973 as a direct result of controversy surrounding the closure of open pit garbage dumps within Yellowstone National Park during 1968-72. ![]() The Interagency Grizzly Bear Study Team (IGBST) is an interdisciplinary group of scientists and biologists responsible for long-term monitoring and research efforts on grizzly bears in the Greater Yellowstone Ecosystem (GYE).
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