[Factors affecting the qualitative and quantitative composition of the acari fauna of house dust. III. Seasons].
The seasonal variations in the number of mites present in the house dust of six homes in Barcelona were studied. The samples were taken at monthly intervals between September 1972 and January 1974. Tables I and II show the total number of mites and the number of Pyroglyphidae present in each of the samples. Table III shows the monthly average of the atmospheric temperature and relative humidity (R.H.). Graphing the average of mites present in the monthly  samples and comparing them to the graph of the atmospheric R.H. an almost perfect correlation of the atmospheric R.H. with the number of mites was observed (Graph 1). The statistical analysis of the results shows the existence of a highly significant correlation (alpha less than 0.001) between the average of the atmospheric R.H. of a given month and the decimal logarithm of the number of mites present in the house dust the following month (Tables IV and V; Graphs 4 and 5). The following results can be pointed out: a) The quality of mites in the house dust of Barcelona changes considerably during the year. b) The quantity is greatest during spring and autumn. c) The annual variation differs from year to year. In conclusion, it is shown that the seasonal variations in the quantity of mites present in the house dust of Barcelona are proportional to the variations in atmospheric R.H.
D000053:Acari / Q000032:analysis*; D004391:Dust; D012621:Seasons
D004391:Dust
Factores que influyen en la composición cuali y cuantitativa de la fauna de ácaros del polvo doméstico. III. Epoca del año.