Estimating abundance from repeated presence-absence data or point counts

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We describe an approach for estimating occupancy rate or the proportion of area occupied when heterogeneity in detection probability exists as a result of variation in abundance of the organism under study. The key feature of such problems, which we exploit, is that variation in abundance induces variation in detection probability. Thus, heterogeneity in abundance can be modeled as heterogeneity in detection probability. Moreover, this linkage between heterogeneity in abundance and heterogeneity in detection probability allows one to exploit a heterogeneous detection probability model to estimate the underlying distribution of abundances. Therefore, our method allows estimation of abundance from repeated observations of the presence or absence of animals without having to uniquely mark individuals in the population.
Publication type Article
Publication Subtype Journal Article
Title Estimating abundance from repeated presence-absence data or point counts
Series title Ecology
Volume 84
Issue 3
Year Published 2003
Language English
Contributing office(s) Patuxent Wildlife Research Center
Description 777-790
Larger Work Type Article
Larger Work Subtype Journal Article
Larger Work Title Ecology
First page 777
Last page 790
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