| 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 1995-1999 and the 2-yr period 1998-1999. These short-term changes were placed in the context of population trends estimated over the 1966-1999 interval. During 1995-1999, 44% of all species exhibited positive trends over the entire survey area, while 44% of all species exhibited positive trends during 1998-1999; neither of these percentages differed significantly from 50%. 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 (19%). However, during 1995-1999 the declines were less extreme in the Central and Western BBS regions, with 49% and 36% of species increasing in these regions. Neotropical migrants continued to fare better than grassland birds in all regions, although in the Eastern BBS region only 30% of neotropical species had increasing trends during 1995-1999. |
| Genre: | Article |
| ProdID: | 5224089 |
| Citation Author: | Pardieck, K.L.; Sauer, J.R. |
| Citation Contributing Office: | Patuxent Wildlife Research Center |
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| Citation End Page: | 48 |
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| Citation Language: | English |
| Citation Larger Work Title: | Bird Populations |
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| Citation Number Of Pages: | 19 |
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| Citation Phsyical Description: | 30-48 |
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| Citation Search Results Text: | The 1995-1999 Summary of the North American Breeding Bird Survey; 2000; Article; Journal; Bird Populations; Pardieck, K.L.; Sauer, J.R. |
| Citation Start Page: | 30 |
| Citation Volume: | 5 |
| Citation Year: | 2000 |
| Type: | citation/reference |
| Text: | The 1995-1999 Summary of the North American Breeding Bird Survey; 2000; Article; Journal; Bird Populations; Pardieck, K.L.; Sauer, J.R. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| Date Other: | Wed, 16 Jun 2010 12:18 -0500 |
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