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Estimating bird abundance: making methods work

Research output: Contribution to journalArticle

Abstract

In many bird monitoring Surveys, no attempt is made to estimate bird densities or abundance. instead, counts of one form or another are made, and these are assumed to correlate with bird density. Unless complete Counts Oil Sample plots are feasible, this approach can easily lead to false conclusions, because detectability of birds varies by species, habitat, observer and many other factors. Trends in time of counts often reflect trends in detectability, rather than trends in abundance. Conclusions are further compromised when surveys are conducted at unrepresentative sites. We consider how to avoid these problems. We give a brief description of distance sampling methods, which allow detectability to be estimated. We consider strategies to ease their implementation, to enhance their reliability, to adapt the methods for difficult species, and to deal with circumstances in which representative sampling is problematic. We also consider some of the common problems encountered, and suggest solutions.

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Original languageEnglish
Pages (from-to)S91-S108
Number of pages18
JournalBird Conservation International
Volume18
Issue numberS1
Early online date7 Aug 2008
DOIs
Publication statusPublished - Sep 2008

    Research areas

  • Distance sampling surveys, Point-count surveys, Atlantic forest, Density, Conservation, Islands, Habitat, Census, Size

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ID: 601511

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