Circadian periodicities of some airborne pollen at Gulbarga, India

Abstract

Circadian periodicities for 11 airborne pollen types abundant in the air over Gulbarga was determined based on the air sampling data obtained by operating a Burkard volumetric spore trap for a period of one year from July 1984 to June 1985. In general, pollen concentration in air was high between 10-16 h with peak incidence around noon. A number of circadian periodicities were observed. Peak concentration for most types occurred at about mid-day, these included Parthenium hysterophorus, Cyperaceae Amaranthus-chenopod group, Helianthus annus and Xanthium strumarium. Acacia nilotica and Cassia auriculata peaks were around dawn. Members of Poaceae, Eucalyptus sp. and Argemone mexicana showed post-dawn pattern. © 1986 Indian Academy of Sciences.