| Abstract: | We examined data from point counts of varying duration in bottomland forests of west Tennessee and the Mississippi Alluvial Valley to determine if counting interval influenced sampling efficiency. Estimates of standard error increased as point count duration increased both for cumulative number of individuals and species in both locations. Although point counts appear to yield data with standard errors proportional to means, a square root transformation of the data may stabilize the variance. Using long (>10 min) point counts may reduce sample size and increase sampling error, both of which diminish statistical power and thereby the ability to detect meaningful changes in avian populations. |
| Genre: | Article |
| ProdID: | 5223801 |
| Citation Author: | Smith, W.P.; Twedt, D.J.; Hamel, P.B.; Ford, R.P.; Wiedenfeld, D.A.; Cooper, R.J. |
| Citation Contributing Office: | Patuxent Wildlife Research Center |
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| Citation End Page: | 456 |
| Citation Issue: | 3 |
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| Citation Language: | English |
| Citation Larger Work Title: | Journal of Field Ornithology |
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| Citation Number Of Pages: | 7 |
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| Citation Phsyical Description: | 450-456 |
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| Citation Search Results Text: | Increasing point-count duration increases standard error; 1998; Article; Journal; Journal of Field Ornithology; Smith, W.P.; Twedt, D.J.; Hamel, P.B.; Ford, R.P.; Wiedenfeld, D.A.; Cooper, R.J. |
| Citation Start Page: | 450 |
| Citation Volume: | 69 |
| Citation Year: | 1998 |
| Type: | citation/reference |
| Text: | Increasing point-count duration increases standard error; 1998; Article; Journal; Journal of Field Ornithology; Smith, W.P.; Twedt, D.J.; Hamel, P.B.; Ford, R.P.; Wiedenfeld, D.A.; Cooper, R.J. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| URL (DOCUMENT): | http://elibrary.unm.edu/sora/JFO/v069n03/p0450-p0456.pdf |
| Date Other: | Wed, 16 Jun 2010 12:18 -0500 |
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