Changes in atmospheric spore content: Diurnal periodicity and the effects of weather

摘要: The use of a power-operated suction trap, in which spores are impacted on the sticky surface slowly moving slide, made it possible to estimate accurately concentration different kinds spore air at any given time. In an open field 2 m. above ground catches often consisted predominantly small hyaline spores, types rarely caught by other trap. Changes times day showed that some species have well-defined diurnal periodicity; also reflect changes weather. dry weather, pollen grains and such fungi as Cladosporium, Erysiphe, Alternaria , smuts rusts, main components spora; they most abundant afternoon least early morning. Phytophthora infestans Polythrincium trifolii occur, but reach their maximum before noon. Prolonged rain removes these for time there few air. Within hours start rain, typical dry-air spora is replaced ; can be identified, include splash-dispersed types, ascospores basidiospores. Except after this damp-air occurs quantity only night when dew formed, greatest reached between midnight dawn. Basidiospores were dominant type spore. Hyaline forms, mainly Sporobolomyces sp., rapidly large numbers morning, particularly was heavy dew, then disappeared almost completely. Coloured basidiospores from Agaricales commonest night, occurrence depended less weather than forms periodicity pronounced.