ECOLOGICAL RELATIONSHIP OF HOUSE DUST MITES TO AGE OF THE HOUSE

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  • 室内塵ダニ相と家屋の建築後年数(および増改築)の関連について

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One hundred and twenty-two residences in Saitama prefecture were surveyed over the period 1981 to 1983 for house dust mites, the ecological relationship between mite fauna and house age was studied. Houses were classified into 5 groups according to their age old. The groups were:less than 3 years old, 3-5, 9-11, 15-17 and more than 20 years old. One other special group was designated:houses in which less than 3 years had elapsed since an extension had been made or since the "Tatami" straw floor matting had been changed. Mites commonly found were:Pyroglyphidae, Acaridae, Glycyphagidae, Tarsonemidae, Cheyletidae, Mesostigmata and Oribatei, Pyroglyphid mites, which were relatively scarce in newly built houses, but gradually increased in number with the age of the house. Conversely, which were found in abundance in new house, slowly decreased in number with the age of house. Pyroglyphid and Oribatid mites were superior in numbers to the other mites and their numbers and relative percentages correlated precisely with house age. A direct ecological relationship was observed between mite fauna and house age; which could be divided into the following phases:less than 5 years; more than 9 years old; and in-between phase(period of extension/change of mattress).

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