Theoretical daily variation patterns of airborne pollen in the southwest of spain

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Abstract
In this work we establish theoretical daily pollen variation grains for the 24 taxa most frequently occurring in the atmosphere of Córdoba (Spain) during three consecutive years, namely Alnus glutinosa, Broussonetia papyrifera, Casuarina equisetifolia, Chenopodiaceae, Amaranthaceae, Cupressaceae, Cyperaceae, Ericaceae, Fraxinus, Gramineae, Mercurialis, Morus, Myrtaceae, Olea europaea, Palmae, Pinaceae, Pistacia, Plantago, Platanus hybrida, Populus, Quercus, Rumex, Typha domingensis, Ulmus minor and Urticaceae. Sampling was carried out using a Burkard spore-trap and the data collected were used to establish theoretical patterns of daily variation represented by an ideal day with accounts for the daily behaviour of each taxon. The application of centred-data analysis (CDA) allowed two groups of taxa to be established, namely (a) those with a homogeneous variation pattern and small differences between the times of maximum and minimum occurrence, and (b) those with a heterogeneous variation pattern arising from large differences between maxima and minima or from a rather erratic variation. As a rule, maximum pollen concentrations were found to coincide with the times of maximum sunlight and temperature.