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A variable circular-plot method for estimated bird numbers

Condor

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Abstract

A bird census method is presented that is designed for tall, structurally complex vegetation types, and rugged terrain. With this method the observer counts all birds seen or heard around a station, and estimates the horizontal distance from the station to each bird. Count periods at stations vary according to the avian community and structural complexity of the vegetation. The density of each species is determined by inspecting a histogram of the number of individuals per unit area in concentric bands of predetermined widths about the stations, choosing the band (with outside radius x) where the density begins to decline, and summing the number of individuals counted within the circle of radius x and dividing by the area (Bx2). Although all observations beyond radius x are rejected with this procedure, coefficients of maximum distance.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
A variable circular-plot method for estimated bird numbers
Series title:
Condor
Volume
82
Issue:
3
Year Published:
1980
Language:
English
Contributing office(s):
Patuxent Wildlife Research Center
Description:
309-313
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Condor
First page:
309
Last page:
313
Number of Pages:
5