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The World of Protozoa, Rotifera, Nematoda and Oligochaeta

Ref ID : 1615

Tagami Kazumi, Ishihara Takaya, Hosokawa Jyun-ichi, Ito Masamichi, and Fukuyama Kenji; Occurrence of aquatic oribatid and astigmatid mites in swimming pools. Water Research 26(11):1549-1554, 1992

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The geographic distribution, density, species composition, food habits and route of invasion of aquatic oribatid and astigmatid mites in swimming pools were studied. These animals occurred in 53% of the indoor swimming pools tested. Oribatids were found only in a restricted area, while astigmatids were widely distributed throughout Japan. The identified species were Hydronothrus crispus Aoki in four pools, Trimalaconothrus maniculatus Fain et Lambrechts in four and Histiostoma ocellatum Fain et Lambrechts in 15 of 36 pools. Mite faunas were usually very simple, being of a single species; if other species were found to co-exist they were few in number. The highest density determined by our tests was less than 50 individuals/m2. To clarify the route of invasion to the pools, 50-100 m3 of the water entering a pool was screened through a nylon mesh. Mites found in the residue on the screen were of the same species as those found in the swimming pools.