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Effects of point count protocol on bird abundance and variability estimates and power to detect population trends

F. R. Thompson, Auteur ; D. E. Burhans, Auteur ; B. Root, Auteur

Dans Journal of Field Ornithology (73(2) SPR 2002)

We used a three-year point-count data set from Hoosier National Forest, Indiana, to evaluate alternative point-count sampling strategies for detecting songbird declines. Repeated-measures ANOVA indicated that mean abundance estimates increased w[...]

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