Airborne pollen and spores monitoring in Buenos Aires city: A preliminary report. Part II. Herbs,weeds (NAP) and spores. General discussion

Summary The herds and weeds pollen (NAP) and spores of Buenos Aires city were collected using a Tauber trap from July 1989 to June 1990. A high NAP pollen production period was found from October to March, reaching an annual peak in October. The NAP fraction is dominated by Compositae, Poaceae, Cyperaceae and Chenopodiaceae/Amaranthoideae. Spores are scarce along the year and they are mainly represented by Bryophytes. From the comparison of trees and shrubs pollen content (AP), NAP and Spores fractions, three aeropalynological seasons could be described: An AP Season with dominance of trees and shrubs, from July to October; a NAP Season with dominance of herbs and weeds, from November to April, and a Spore Season from May to June.