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Title: A New Approach for Analyzing Bird Densities from Variable Circular-Plot Counts 
Author: Fancy, Steven G.
Date: 1997-01
Publisher: University of Hawaii Press
Citation: Fancy SG. 1997. A new approach for analyzing bird densities from variable circular-plot counts. Pac Sci 51(1): 107-114.
Abstract: An approach for calculating bird densities from variable circular-plot
counts is described. The approach differs from previous methods in that data from
several surveys are pooled and detection distances are adjusted as if all distances
were recorded by a single observer under a given set offield conditions. Adjustments
for covariates that affect detection distances such as observer, weather, time of
day, and vegetation type are made using coefficients calculated by multiple linear
regression. The effective area surveyed under standard conditions is calculated from
the pooled data set and then used to determine the effective area surveyed at each
sampling station under the actual conditions when the station was sampled. The
method was validated in two field studies where the density of birds could be
determined by independent methods. Computer software for entering and analyzing
data by this method is described.
ISSN: 0030-8870

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