Using search time and regression to estimate abundance of territorial spotted owls

J. P. Ward, A. B. Franklin, R. J. Gutierrez

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Abstract

Used a Leslie regression model (LRM) to estimate the number (N0) and the variance of the number of adult and subadult northern spotted owls Strix occidentalis caurina in a territorial population from direct counts within a 292 km2 study area. Estimates of N0 from day counts were more accurate and precise and more robust to fluctuations in survey effort than estimates from night counts. LRM estimates from day counts were not significantly different from 2 different maximum-likelihood estimates and required 30-64% less effort. -from Authors

Original languageEnglish (US)
Pages (from-to)207-214
Number of pages8
JournalEcological Applications
Volume1
Issue number2
DOIs
StatePublished - 1991

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