Document Type

Article

Publication Title

Ecological Applications

Publisher

The Ecological Society of America

Publication Date

7-2016

Volume

26

Issue

5

Disciplines

Biology | Life Sciences

Abstract

The most popular method used to gain an understanding of population trends or of differences in bird abundance among land condition categories is to use information derived from point counts. Unfortunately, various factors can affect one’s ability to detect birds, and those factors need to be controlled or accounted for so that any difference in one’s index among time periods or locations is an accurate reflection of differences in bird abundance and not differences in detectability. Avian ecologists could use appropriately sized fixed-area surveys to minimize the chance that they might be deceived by distance-based detectability bias, but the current method of choice is to use a modeling approach that allows one to account for distance-based bias by modeling the effects of distance on detectability or occupancy. I challenge the idea that modeling is the best approach to account for distance-based effects on the detectability of birds because the most important distance-based modeling assumptions can never be met. The use of a fixed-area survey method to generate an index of abundance is the simplest way to control for distance-based detectability bias and should not be universally condemned or be the basis for outright rejection in the publication process.

Keywords

detectability, distance, index, inference, occupancy, point count

DOI

http://dx.doi.org/10.1002/eap.1385

Rights

© 2016 by the Ecological Society of America

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