The breeding bird survey: its first fifteen years, 1965-1979.

Abstract

The Breeding Bird Survey, sponsored by the US Fish & Wildlife Service and the Canadian Wildlife Service, primarily aims to estimate population trends of nesting birds of North America. This survey provides information, both locally by ecological or administrative regions and on a continental scale, on 1) short-term population changes that can be correlated with specific weather events, 2) recovery periods following catastrophic declines, 3) normal year-to-year variations, 4) long-term population trends, and 5) invasions of exotics. The survey also permits computer mapping of relative abundance of each species. Population trends for 230 species are here discussed and graphed. -from Authors