Sex of oribatid mites (Acari : Oribatida) -approach to comparison between arboreal and soil habitats-

建立了一种从保存凭证标本的甲螨中提取DNA的方法。此外，包括树栖和土栖物种在内的系统发育树表明，树栖生物在土壤环境中独立进化了多次，孤雌生殖进化了多次。此外，本研究还发现，在叶片分解的早期阶段，孤雌生殖物种往往占据优势地位，并且孤雌生殖物种能够在树木栖息地存在的悬浮土壤中生存。

A method of extracting DNA from oribatid mites that preserved the voucher specimen was established. Moreover, phylogenetic tree including arboreal and soil-living species suggests that arboreal life have evolved many times independently, and parthenogenesis have evolved many times in the soil environment. In addition, this study finds that parthenogenetic species tend to become dominant in early stage of leaf decomposition, and parthenogenetic species is able to live in suspended soils existing at arboreal habitats.