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Considerations for monitoring raptor population trends based on counts of migrants

PDF on file: 3834_Titus.pdf
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, ,
Edited by:
B-U. Meyburg, 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.

Additional Publication Details

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
Number of Pages:
611