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Effects of Habitat Heterogeneity on the Species-Area Relationships of Forest Birds
William J. Boecklen
Journal of Biogeography
Vol. 13, No. 1 (Jan., 1986), pp. 59-68
Published by: Wiley
Stable URL: http://www.jstor.org/stable/2844849
Page Count: 10
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Habitat heterogeneity is an important underlying component of the species-area relationship. I directly measure its effects on the species-area relationships of forest birds with data from the 45th Breeding Bird Census. A habitat space for thirty-four plots is created by principal components analysis. Euclidean within this space is used as a measure of between-plot habitat differences. By combining pairs of plots to create a series of composite plots. I convert measures of between-plot differences in vegetation structure into measures of within-plot habitat heterogeneity. I calculate all 561 pairwise distances within the habitat space. I combine species counts and areas for 104 pairs of plots selected from the lower tail, middle, and upper tail of the pairwise-distance distribution. Habitat heterogeneity is a significant predictor of species number even after area is factored out. Furthermore, the set of pairs selected from the three regions of the pairwise-distance distribution differ significantly in the intercepts or in the slopes of their species-area regressions. Implications for conservation are discussed.
Journal of Biogeography © 1986 Wiley