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Oribatid mites are abundant in a range of environments and are therefore valuable as indicators in evaluating environmental biodiversity (Wallwork, 1976). Because the composition of mite communities at the sub-order level is relatively stable in identical environments (in terms of their vegetation, climate, etc.) (Maraun and Scheu, 2000; Osler and Beattie, 1999), comparison of these communities is useful for evaluating the effects of wildfi re on soil zoological biodiversity. Although soil organisms have to be alive to be extracted with Tullgren funnels, it is sometimes diffi cult to maintain live, fi eld-collected mites back to the laboratory. To solve this problem, a portable extracting apparatus using a disposable heater as a heat source (the Fukuyama apparatus) (Fig.1) was developed to directly extract mites in the field (Fukuyama, 1994). In a comparative laboratory study, extraction efficiency was similar to that of a Tullgren funnel (Fukuyama, unpublished data). However, its effi ciency had never been tested in the fi eld. In this study, the effi ciency of the Fukuyama apparatus was tested in the fi eld by comparing it with the Tullgren funnel. Simulating an actual fi eld survey, a comparison of the extraction effi ciency of this apparatus was made with that of the Tullgren funnel, which included comparing the time required to transport funnels to the laboratory. Samples collected in Fukuyama et al. (1999) were used.

Oribatid Mite Extraction Efficiency of the Fukuyama Apparatus, a Perpendicular-Type Extracting Apparatus Using a Commercial Disposable Heater