Reappraisal of the Winter Bird-Population Study technique

Edited by: C. John Ralph and J. Michael Scott


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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.
Publication type Book chapter
Publication Subtype Book Chapter
Title Reappraisal of the Winter Bird-Population Study technique
Year Published 1981
Language English
Contributing office(s) Patuxent Wildlife Research Center
Description x, 630
Larger Work Type Book
Larger Work Subtype Other Government Series
Larger Work Title Estimating Numbers of Terrestrial Birds
First page 52
Last page 57
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