Avian abundance in riparian zones of three forest types in the Cascade Mountains, Oregon

We surveyed bird populations along headwater streams of old-growth, ma-ture, and young coniferous forests of the Oregon Cascade Mountains during summer andwinter. Brown Creepers (Certhia americana), Chestnut-backed Chickadees (Parus rules-cens), Golden-crowned Kinglets (Regulus satrapa), Evening Grosbeaks (Hesperiphona yes-pertinus), and Winter Wrens (Troglodytes troglodytes) were common in all stand types.During the summer, abundances of Brown Creepers, Hammond's Flycatchers (Empidonaxhammondii), Hermit/Townsend's warblers (Dendroica occidentalis), and Chestnut-backedChickadees were significantly higher in old-growth and mature forests compared to youngforests. Species richness and densities generally were not significantly different among thestand types during winter. However, numbers of Chestnut-backed Chickadees, Evening Gros-beaks, Golden-crowned Kinglets, Hairy Woodpeckers (Picoides villosus), and Winter Wrenswere 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 thisstudy compared to other studies in upland forests and may be riparian associates along theseheadwater streams.