Considerations for monitoring raptor population trends based on counts of migrants
PDF on file: 3834_Titus.pdf
By: K. Titus, M.R. Fuller, and J.L. Ruos
Edited by: B-U. Meyburg and R.D. Chancellor
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Abstract
Various problems were identified with standardized hawk count data as annually collected at six sites. Some of the hawk lookouts increased their hours of observation from 1979-1985, thereby confounding the total counts. Data recording and missing data hamper coding of data and their use with modern analytical techniques. Coefficients of variation among years in counts averaged about 40%. The advantages and disadvantages of various analytical techniques are discussed including regression, non-parametric rank correlation trend analysis, and moving averages.
Suggested Citation
Titus, K., Fuller, M., and Ruos, J., 1989, Considerations for monitoring raptor population trends based on counts of migrants, chap. of Raptors in the Modern World: Proceedings of the III World Conference on Birds of Prey and Owls, p. 19-32.
| Publication type | Book chapter |
|---|---|
| Publication Subtype | Book Chapter |
| Title | Considerations for monitoring raptor population trends based on counts of migrants |
| Year Published | 1989 |
| Language | English |
| Publisher | World Working Group on Birds of Prey and Owls |
| Publisher location | Berlin, Federal Republic of Germany |
| Contributing office(s) | Patuxent Wildlife Research Center |
| Description | 611 |
| Larger Work Type | Book |
| Larger Work Subtype | Other Government Series |
| Larger Work Title | Raptors in the Modern World: Proceedings of the III World Conference on Birds of Prey and Owls |
| First page | 19 |
| Last page | 32 |