Observations on the oribatid mite, Oribatula sp. (Or. -1), the intermediate host of Moniezia expansa in Japan

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  • Fukui Masanobu
    Department of Parasitology, Institute for Infectious Diseases, University of Tokyo:Laboratory of Veterinary Medicine, Faculty of Agriculture, University of Tokyo

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  • 拡張条虫の中間宿主となるササラダニ類に関する観察
  • カクチョウ ジョウチュウ ノ チュウカン ヤドヌシ ト ナル ササラダニルイ ニ カンスル カンサツ

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Abstract

The author has collected the oribatid mites in various parts of Japan. Three methods of collection were applied; Modified Berlese's funnel method (drying cone method), Watanabe's wood plate method and Direct collection technic. Berlese's funnel method was one of the best technics for the survey of the fauna of the mites. Direct collection method with badger hair brush was most simple but non-efficient technic. Watanabe's collection technic with wood plate was one of the effective and simple methods of collection for oribatid mites, especially Oribatula sp. (Or. -1). The author also collected this species by the same method. Tested woods were fresh cider and old pine plate. Many mites were collected on pine plate in the morning. Collected mites were kept in plastic vessel, which contained plaster of Paris and charcoal in the bottom. In this medium the adult mites lived for several months to one year. In the early autumn of 1957, the diurnal rhythmic activity of oribatid mites, Oribatula sp. (Or. -1), the intermediate host of Moniezia expansa in Japan was observed in a pine-forest in Kashiwazaki City, Niigata Prefecture, Japan. The number of the oribatid mites observed on the undersurface of old pine plates, which had been placed on the ground 12 hours before the observations were counted every hour for 26 hours. The number of observed mites on the undersurface of plates was about 70% of the total number counted on both sides of the plates. The ratio was almost constant in the daytime (from 7.00 A.M. to 10.00 A.M.) as well as in the night time (from 6.00 P.M. to 5.00 A.M.). The number of mites observed on cider plates were less in number than on pine plates. The environmental factors as the soil temperature 5cm beneath the ground surface, the air temperature and relative humidity 5cm above the soil surface, were recorded at the each time of observations. It was revealed that the number of the mites observed on the undersurface of pine plates showed significant positive correlation to the air and soil temperature.

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