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Abstract
The North American Breeding Bird Survey (BBS) was used to estimate continental and regional changes in bird populations during 1989-1990 and 1990-1991, placing these short-term changes within the context of population trends since 1966. For the entire survey area, 51.7% of the species exhibited increases in population size during 1989-1990, reversing the decreasing tendency exhibited by the majority of species during 1988-1989. A similar percentage (51.4%) of species with increasing populations was noted during 1990-1991. These percentages were also analyzed for 12 guilds of North American birds and 3 broad geographical regions. Many regional patterns exist in these population changes, reflecting the variability inherent in short-term population fluctuations. Two-year (1989-1990 and 1990-1991) changes and long-term (1966-1990) continental trends are provided for 255 species.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | North American Breeding Bird Survey annual summary 1990-1991 |
| Series title | Bird Populations |
| Volume | 1 |
| Year Published | 1993 |
| Language | English |
| Contributing office(s) | Patuxent Wildlife Research Center |
| Description | 52-67 |
| Larger Work Type | Article |
| Larger Work Subtype | Journal Article |
| Larger Work Title | Bird Populations |
| First page | 52 |
| Last page | 67 |
| Google Analytic Metrics | Metrics page |