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Highlight: We studied the impact of fire on an ungrazed sacaton grassland community at The Research Ranch in southeastern Arizona. Two swmner hums were followed through two post-fire growing seasons. A winter burn was studied through one post-tire growing season. Burning reduced the height and extent of sacaton grass (Sporobolus wrighfii) itself, and stimulated growth of other grasses and forhs. Summer fires created more hare ground and encouraged a greater number and variety of annuals than the winter tire. The tires had the effect of reducing total smallmammal populations and greatly increasing bird populations. llwse results were more dramatic on the areas which burned in early summer than on the winter-burned plot. Raptors and most game birds, particularly mourning doves, were most abundant on one-year-old burns. Seed-eating birds (Fringillidae) preferred burned over unburned areas. Cotton rat (Sigmodon hispidus) populations were greatly reduced by the tires, while populations of seed-eating pocket mice (Perognathus) and kangaroo rats (Dipodomys) increased, especially on the summer hums. Sacaton grasslands recover rapidly even from summer burning, at least in the absence of livestock. Results of this study suggest that fire is beneficial to the indigenous plants and wildlife of sac&on communities, as long as a mosaic of different aged stands is maintained.

Response of Birds, Small Mammals, and Vegetation to Burning Sacaton Grasslands in Southeastern Arizona