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Avian Abundance in Riparian Zones of Three Forest Types in the Cascade Mountains, Oregon
Robert G. Anthony, Gregory A. Green, Eric D. Forsman and S. Kim Nelson
The Wilson Bulletin
Vol. 108, No. 2 (Jun., 1996), pp. 280-291
Published by: Wilson Ornithological Society
Stable URL: http://www.jstor.org/stable/4163682
Page Count: 12
You can always find the topics here!Topics: Old growth forests, Birds, Riparian forests, Coniferous forests, Forest stands, Forest habitats, Riparian areas, Species, Winter, Woodpeckers
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We surveyed bird populations along headwater streams of old-growth, mature, and young coniferous forests of the Oregon Cascade Mountains during summer and winter. Brown Creepers (Certhia americana), Chestnut-backed Chickadees (Parus rufescens), Golden-crowned Kinglets (Regulus satrapa), Evening Grosbeaks (Hesperiphona vespertinus), and Winter Wrens (Troglodytes troglodytes) were common in all stand types. During the summer, abundances of Brown Creepers, Hammond's Flycatchers (Empidonax hammondii), Hermit/Townsend's warblers (Dendroica occidentalis), and Chestnut-backed Chickadees were significantly higher in old-growth and mature forests compared to young forests. Species richness and densities generally were not significantly different among the stand types during winter. However, numbers of Chestnut-backed Chickadees, Evening Grosbeaks, Golden-crowned Kinglets, Hairy Woodpeckers (Picoides villosus), and Winter Wrens were much higher in the winter than in summer. Swainson's Thrushes (Catharus ustulatus) and Rufous Hummingbirds (Selasphorus rufus) were more abundant in riparian areas in this study compared to other studies in upland forests and may be riparian associates along these headwater streams.
The Wilson Bulletin © 1996 Wilson Ornithological Society