Breeding Bird Survey: Its First Fifteen Years, 1965-1979

摘要

The Breeding Bird Survey is an ongoing cooperative program sponsored jointly by the Service (Patuxent Wildlife Research Center) and the Canadian Wildlife Service. Its main purpose is to estimate population trends of more than 230 species of birds that nest in North America north of Mexico and that migrate across international boundaries. The survey provides information, both locally by ecological or political regions and on a continental scale. The three major regions discussed are the Eastern, Central, and Western bounded by the Mississippi and the eastern base of the Rocky Mountains.