Point counts of birds: what are we estimating?
General Technical Report
PSW-GTR-149
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Abstract
Point counts of birds are made for many reasons, including estimating local densities, determining population trends, assessing habitat preferences, and exploiting the activities of recreational birdwatchers. Problems arise unless there is a clear understanding of what point counts mean in terms of actual populations of birds. Criteria for conducting point counts depend strongly on the purposes to which they will be put. This paper provides a simple mathematical conceptualization of point counts and illustrates graphically some of the influences on them.
Suggested Citation
Johnson, D.H., 1995, Point counts of birds: what are we estimating?: General Technical Report PSW-GTR-149 , 7 p.
| Publication type | Report |
|---|---|
| Publication Subtype | Federal Government Series |
| Title | Point counts of birds: what are we estimating? |
| Series title | General Technical Report |
| Series number | PSW-GTR-149 |
| Year Published | 1995 |
| Language | English |
| Publisher | U.S. Forest Service |
| Contributing office(s) | Northern Prairie Wildlife Research Center |
| Description | 7 p. |
| Larger Work Type | Report |
| Larger Work Subtype | Federal Government Series |
| Larger Work Title | Monitoring bird populations by point counts |
| First page | 117 |
| Last page | 123 |