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Grand Teton National Park Report

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Although the number of Canada geese (Branta canadensis) in the United States has nearly doubled between 1955 and 1974, Pacific Flyway populations declined 10 percent (Bellrose, 1976). The decline's causes are not obvious and it may be important to determine the relative role of the individual populations in these dynamics. During earlier work, Dimmick (1968) concluded that the 1964 breeding population of Canada geese in Jackson Hole was stabilized at approximately 300 pairs with 40-47 percent consisting of breeding pairs. In order to determine how dramatic land use changes in this area may have affected the geese, this study compares current conditions and the resulting population status with those of the late 1940's (Craighead and Craighead, 1949) and the early 1960's.