Trumpeter Swan Productivity in Grand Teton National Park, Wyoming
This is a report of some of my activities carried out during the summers of 1974 through 1976 in Grand Teton National Park, which were associated with field work in the gathering of materials for a book on the ecology and behavior of sandhill cranes and trumpeter swans in the park. Only one month (May 22 to June 22) was spent in the park during 1976, and thus no data on swan productivity were obtained in that year. Data on the park's swan production for the years prior to 1974 were obtained from the card files of the National Park Service and have been organized in such a way as to make them comparable to similar data by J. Halladay from Yellowstone National Park (Proceedings of the Third Trumpeter Swan Society Conference, 1973), and published data from Red Rock Lakes National Wildlife Refuge (North American Fauna No. 63, 1960) and from Alaska (Wildlife Monographs (No. 26, 1971), and R. Page's unpublished data from Red Rock Lakes (Ph. D. dissertation, University of Montana, 1974).