| Abstract: | One of the major purposes of bird population studies is to document changes in population size over a period of years. The traditional method used in Europe and North America to detect population change is to calculate annual ratios. However, this method can produce spurious results when ratios are accumulated over many years. Consequently, new methods of computing trends are needed. Several new methods of estimating population trends are developed and illustrated with data from the North American Breeding Bird Survey (BBS). Each method is compared in terms of its assumptions, biases, and limitations. On the basis of these comparisons we recommend one method that we feel most accurately detects true population trends. Both the biological and statistical justifications for the model selection are presented. Trends estimated with this model are then presented for two species. |
| Genre: | Book chapter |
| ProdID: | 5210275 |
| Citation Author: | Geissler, P.H.; Noon, B.R. |
| Citation Contributing Office: | Patuxent Wildlife Research Center |
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| Citation Editor: | Ralph, C. John; Scott, J. Michael (editors) |
| Citation End Page: | 51 |
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| Citation Language: | English |
| Citation Larger Work Title: | Estimating Numbers of Terrestrial Birds |
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| Citation Phsyical Description: | x, 630 |
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| Citation Publisher: | Cooper Ornithological Society |
| Citation Series: | Studies in Avian Biology |
| Citation Series Code: | |
| Citation Series Number: | 6 |
| Citation Search Results Text: | Estimates of avian population trends from the North American Breeding Bird Survey; 1981; Book chapter; 6; Estimating Numbers of Terrestrial Birds; Geissler, P.H.; Noon, B.R. |
| Citation Start Page: | 42 |
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| Citation Year: | 1981 |
| Type: | citation/reference |
| Text: | Estimates of avian population trends from the North American Breeding Bird Survey; 1981; Book chapter; 6; Estimating Numbers of Terrestrial Birds; Geissler, P.H.; Noon, B.R. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| Date Other: | Tue, 9 Jun 2009 09:23 -0500 |
| Publisher: | Cooper Ornithological Society |
