| Abstract: | Standardized morning and afternoon counts were conducted in two deciduous forest plots during seven winters. Morning counts yielded more species than afternoon counts, as well as higher counts of most species. A minimum of eight visits is recommended. Six visits yielded 2% to 5% fewer species, depending on the size and bird population of the study plot. Cumulative means for individual species varied erratically for most species when the number of visits was less than seven. |
| Genre: | Book chapter |
| ProdID: | 5210257 |
| Citation Author: | Robbins, C.S. |
| Citation Contributing Office: | Patuxent Wildlife Research Center |
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| Citation Editor: | Ralph, C. John; Scott, J. Michael (editors) |
| Citation End Page: | 57 |
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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 Series: | Studies in Avian Biology |
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| Citation Search Results Text: | Reappraisal of the Winter Bird-Population Study technique; 1981; Book chapter; Estimating Numbers of Terrestrial Birds; Robbins, C.S. |
| Citation Start Page: | 52 |
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| Citation Year: | 1981 |
| Type: | citation/reference |
| Text: | Reappraisal of the Winter Bird-Population Study technique; 1981; Book chapter; Estimating Numbers of Terrestrial Birds; Robbins, C.S. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| Date Other: | Tue, 9 Jun 2009 09:23 -0500 |
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