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Abstract
Data from the North American Breeding Bird Survey were used to estimate continental and regional changes in bird populations for the 6-yr period 2003-2008 and the 2-yr period 2007-2008. These short-term changes were placed in the context of population trends estimated over the 1966-2008 interval. Across the entire survey area, a higher proportion of species exhibited positive growth during 2003-2008 (64%) than during the long-term (46%) or the more recent 2-yr-term (39%). The 2003-2008 growth occurred relatively evenly across the Western, Central, and Eastern BBS regions, with 59%, 66%, and 61% of all species increasing, respectively. We additionally evaluated the proportion of species with positive trend estimates in each of 12 life-history based groupings at continental and regional levels. Survey-wide, birds in the grassland guild demonstrated the lowest proportion of positive trends over the entire survey period (21% increasing), with significant declines occurring in both the Eastern and Western regions (5% increasing and 18% increasing, respectively). Birds in the wetland breeding guild exhibited the greatest proportion of positive trends, with a significant number of increasing species (between 77-90%) occurring in all three BBS regions during 2003-2008.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | The 2003-2008 summary of the North American Breeding Bird Survey |
| Series title | Bird Populations |
| Volume | 10 |
| Year Published | 2010 |
| Language | English |
| Publisher | The Institute for Bird Populations |
| Publisher location | Point Reyes Station, CA |
| Contributing office(s) | Patuxent Wildlife Research Center |
| Description | 20 p. |
| Larger Work Type | Article |
| Larger Work Subtype | Journal Article |
| Larger Work Title | Bird Populations |
| First page | 90 |
| Last page | 109 |
| Time Range Start | 2003-01-01 |
| Time Range End | 2008-12-31 |
| Country | United States |
| Google Analytic Metrics | Metrics page |