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acres Arno aspen big sagebrush bighorn sheep bird populations bitterbrush British Columbia burned areas burned ranges canopy Ceanothus velutinus clearcutting communities conifers cover Creek Department of Agriculture Douglas-fir ecosystem evergreen ceanothus factors Fire Ecology fire history fire severity Fire's Effects forage Forest and Range Forest Service fuels grasslands grazing growth Gruell Hoh Fire Idaho increase influence initial flora insects Intermountain Forest juniper logging Lyon and Stickney mahogany mahogany stands Missoula mountain-mahogany Mueggler mule deer National Park occurred Ogden old-growth Olympic Mountains percent plants plots ponderosa pine postburn postfire prescribed burning prescribed fire quail Range Experiment Station regeneration response resprouting ruffed grouse sampled seed seedling establishment seral shrub shrub succession slopes snowshoe hare soil sprouts Stone's sheep study areas Subalpine fir successional Swan Valley symposium Technical Report tree tridentata U.S. Department unburned understory vegetation white-tailed deer wildfire wildlife habitat Wildlife Management winter deer winter range winter wren