著者

彭城 郁子 須藤 千春 伊藤 秀子

出版者

日本衛生動物学会

雑誌

衛生動物 (ISSN:04247086)

巻号頁・発行日

vol.41, no.3, pp.227-234, 1990

被引用文献数

3 4

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Some factors that affect the occurrence and termination of quiescence in nymphs of Dermatophagoides farinae, were examined. The mites aggregating on the rims and covers of culture bottles were collected when the mite populations were increased. They were kept at 25℃, 75% relative humidity (RH), without food. After 1 month, about 20% of the mites passed into quiescent state, and a half of them remained quiescent for 5 months at 25℃, 75% RH, and further 5 months at room temperature. Most of the quiescent mites were protonymphs. They were glued to the substrate such as covering filter paper. Quiescence in half of the 8-week-aged nymphs terminated when they were disturbed by being separated from the substrate, pretreated at 5℃ for 1 week, and then incubated at 25℃, 75% RH. But the nymphs did not moult by pretreatment of 10,18,and 25℃ for 1 week. The nymphs in age of 20-week or more moulted even when they were continuously incubated at 25℃ and 75% RH, if separation from the substrate was made. The moulting rates depended on age in the nymphs; the older the nymphs, the faster the moulting. However, the nymphs glued onto the substrate remained quiescent. Moulting of nymphs with age of 22-week or more was suppressed by incubating them at lower temperatures than 25℃, or lower than 55% RH. The contact of the quiescent nymphs with water for 3hr enhanced moulting even when they were incubated at 33% RH. These results suggest that quiescence in nymphs of D. farinae observed in the present study might also involve a very similar phenomenon to diapause.