| Abstract: | Data from the North American Breeding Bird Survey were used to estimate continental and regional changes in bird populations for the 5-yr period 1999-2003 and the 2-yr period 2002-2003. These short-term changes were placed in the context of population trends estimated over the 1966-2003 interval. During 1999-2003, 41% of all species exhibited positive trends over the entire survey area, while 64% of all species exhibited positive change between 2002-2003. The continental and regional percentages of species with positive trends were also analyzed for 12 species groups having shared life-history traits. Survey-wide for the entire survey period, grassland birds exhibited the lowest percentage of increasing species (14%), with their sharpest declines occurring in the West during 1999-2003 (10% increasing). During 1999-2003, short-distance migrants experienced significant declines in all regions, where numbers of species with increasing trends ranged from 22% - 34%. Most species fared well during the 2002-2003 period, with 64% (P < 0.05) increasing survey-wide. This was primarily a result of increases in the Central and Western BBS regions where 21 of 24 species groups exhibited significant increases in the number of species with positive trends. |
| Genre: | Article |
| ProdID: | 5224876 |
| Citation Author: | Pardieck, K. L.; Sauer, J.R. |
| Citation Contributing Office: | Patuxent Wildlife Research Center |
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| Citation End Page: | 45 |
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| Citation Language: | English |
| Citation Larger Work Title: | Bird Populations |
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| Citation Number Of Pages: | 18 |
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| Citation Phsyical Description: | 28-45 |
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| Citation Public Comments: | 6937_Pardieck.pdf |
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| Citation Search Results Text: | The 1999-2003 Summary of the North American Breeding Bird Survey; 2007; Article; Journal; Bird Populations; Pardieck, K. L.; Sauer, J.R. |
| Citation Start Page: | 28 |
| Citation Volume: | 8 |
| Citation Year: | 2007 |
| Type: | citation/reference |
| Text: | The 1999-2003 Summary of the North American Breeding Bird Survey; 2007; Article; Journal; Bird Populations; Pardieck, K. L.; Sauer, J.R. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| URL (DOCUMENT): | http://birdpop.net/pubs/files/pardieck/2007/112_Pardieck2007.pdf |
| Date Other: | Wed, 16 Jun 2010 12:18 -0500 |
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