<報文>伊豆式根島のササラダニ群集

概要

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Communities of soil inhabiting oribatid mites were investigated in the natural forests （st. I-II）, the secondary forests （st. ⅠⅠⅠ－IV），theplantations（st．V－VI），thebamboo forest （st. VII） and the secondary grassland （st. VIII） on the islet of Shikine, one of Izu Islands, Central Japan. Against our expectation, the largest species number （63 species） and the highest density （37,596/m2） were obtained from the young plantation of Pinus thunbergii （st. VI）. Among the remaining stations oribatid faunas of natural forests were not distinctly richer than those of secondary or artificial vegetations. The phenomenon was induced probably by the fact that the small islet （only 3.8km2） is of volcanic origin and the fauna is constructed mostly by immigrant species adapting to rather poor environments. The Motomura's law of geometrical progression is not applicable to any of the oribatid communities of the islet and the most dominant species in each station exceeds greatlyin number the second and the succeeding dominant species. Liodes zimmermani is recorded for the first time from Japan.
横浜国立大学の論文