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Abundance of some arthropods inhabiting the duff and soil on three clearout areas that were prescribed burned was investigated in northcentral Idaho. Generally more arthropods were present and more taxa were represented on older burns. In duff samples, the Acarina, Chilopoda, Thysanoptera , Protura, and Thysanura were most numerous in more recent burns. Acarina comprised 77 percent of the fauna in the duff samples. Soil samples collected before mid-July contained about 90 percent of the total number of individuals-mostly immatures—especially on the oldest burn. The most | j abundant arthropod in the soil samples on the oldest burn was the carabid * [i Amara erraticaj (Sturm) . Because of the abundance of this carabid and its » seed-eating behavior, it is recommended that direct seeding of western white ^/ pine ^Pinus monticola iDougl. ) , and perhaps of other conifers, be done the first or second season after prescribed burning. Wildfires are known to reduce the abundance of soil animals--at least temporarily. In a longleaf pine {Pinus palustris Mill.) forest in the Southeast, Heyward and Tissot (1936) found soil microfauna (mostly arthropods) to be 11 times more abundant in both the A horizon and the upper 2 inches (5.08 cm.) of mineral soil on unburned areas than in respective soil depths on burned areas. A study of soil arthropod populations in the Pine Barrens of New Jersey (Buffington 1967) showed significantly higher populations of arthropods on unburned as compared to burned areas. Buffington 's samples from the unburned areas were usually richer in both numbers of taxa and of individuals. In Based on part of a thesis entitled "Biotic factors influencing direct seeding of western white pine (Pinus monticola)" prepared by the junior author in partial fulfillment of the requirements for a master's degree in forestry at the University of Michigan. Respectively : Research Entomologist, stationed in Missoula at the Forestry Sciences Laboratory, maintained in cooperation with the University of Montana; Research Specialist, Forestry and Rangeland, Geigy Agricultural Chemicals Division, CIBA-GEIGY Chemical Corporation, Ardsley, New York. At the time this work was done, the junior author was a seasonal employee of the Intermountain Station, stationed at Moscow, Idaho.

Abundance of arthropods inhabiting duff and soil after prescribed burning on forest clearcuts in northern Idaho