| 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. |
| Genre: | Article |
| ProdID: | 70004023 |
| Citation Author: | Ziolkowski, David J. Jr.; Pardieck, Keith L.; Sauer, John R. |
| Citation Contributing Office: | Patuxent Wildlife Research Center |
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| Citation End Page: | 109 |
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| Citation Language: | English |
| Citation Larger Work Title: | Bird Populations |
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| Citation Number Of Pages: | 20 |
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| Citation Phsyical Description: | 20 p. |
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| Citation Publisher: | The Institute for Bird Populations |
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| Citation Search Results Text: | The 2003-2008 summary of the North American Breeding Bird Survey; 2010; Article; Journal; Bird Populations; Ziolkowski, David J. Jr.; Pardieck, Keith L.; Sauer, John R. |
| Citation Start Page: | 90 |
| Citation Volume: | 10 |
| Citation Year: | 2010 |
| Type: | citation/reference |
| Text: | The 2003-2008 summary of the North American Breeding Bird Survey; 2010; Article; Journal; Bird Populations; Ziolkowski, David J. Jr.; Pardieck, Keith L.; Sauer, John R. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| URL (DOCUMENT): | http://birdpop.net/pubs/files/2010/V10_090_109_BBS.pdf |
| Date Other: | Thu, 22 Dec 2011 13:03 -0600 |
| Publisher: | The Institute for Bird Populations |
