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Nest-Site Selection, Nest Design and Nest-Entrance Orientation in Bachman's Sparrow
Thomas M. Haggerty
The Southwestern Naturalist
Vol. 40, No. 1 (Mar., 1995), pp. 62-67
Published by: Southwestern Association of Naturalists
Stable URL: http://www.jstor.org/stable/30054395
Page Count: 6
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Nest sites of Bachman's Sparrows (Aimophila aestivalis) in pine plantations in central Arkansas had greater tree density and less forb cover than non-nesting sites, but nesting sites could not be separated from non-nesting sites using multivariate analyses. At the microhabitat level, sides of nests had greater vegetation density between 0-60 and 0-180 cm than random points or nest entrances. Most nests were either partially (38%) or completely (55%) domed and most entrances were oriented to the north. Nest design was not affected by degree of concealment, nesting year, or nesting season, but grasses and forbs were taller around domed nests than at partially domed nests. No significant relationships among nest success, nest design, vegetation structure of the macrohabitat or microhabitat were found. This suggests that random predation and/or variation in predator density may have existed.
The Southwestern Naturalist © 1995 Southwestern Association of Naturalists