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Annual fluctuations in the number of the developmental stages of Dermatophagoides spp. (Astigmata: Pyroglyphidae) in the Upper Silesia region, Poland

Abstract Age structure and seasonal dynamics of populations of the pyroglyphid dust mite species were studied for the first time in Poland. Five year surveys on the house dust mite fauna in Upper Silesia (southern part of Poland) formed the basis for this analysis. This study was carried out from 30 December 1981 to 14 September 1986 in Katowice district. A total of 238 dust samples from dwellings were examined, among which 122 (51.3%) were positive for mites. Pyroglyphid mites were found in 105 of the samples (44.1%). In general, fluctuations of the age structure of the population of Dermatophagoides farinae Hughes were similar to those observed by Arlian et al. (1983) for mixed populations of Dermatophagoides spp. in Dayton and Cincinnati (Ohio, USA). Adults were dominant during most part of the year; larvae were the least numerous throughout the year, with peaks of density in July and September. An analysis of the annual dynamics of the pooled populations of D. pteronyssinus (Trouessart) revealed a slightly more constant temporal age structure than in D. farinae, with a permanent dominance of adult mites.