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Alnus andBetula pollen content in the atmosphere of santiago de Compostela, North-Western Spain (1993–1995)

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The present study analyzes the behaviour ofAlnus andBetula pollen in the atmosphere of the town of Santiago de Compostela (N.W. Spain) from January 1993 to December 1995. The main pollination period of both taxa is identified for each sampling year, which, in the case ofAlnus, took place in January and February and, forBetula, during April.Alnus andBetula pollen are found in very high quantities in the atmosphere of Santiago de Compostela, representing 5% and 12% respectively of the total annual pollen that was counted. We studied the correlation between pollen content each year for both taxa and the main meterological parameters (average, maximum and minimum temperatures, precipitation and hours of sunshine). Finally, we analyzed the diurnal behaviour model for each taxon. ForAlnus, the maximum concentrations were found around 20:00 h, while, in the case ofBetula, the main pollen concentration took place between 15:00 h and 20:00 h in 1993 and 1994, and at 00:00 h in 1995.

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Correspondence to María Jesús Aira.

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Aira, M.J., Jato, V. & Iglesias, I. Alnus andBetula pollen content in the atmosphere of santiago de Compostela, North-Western Spain (1993–1995). Aerobiologia 14, 135–140 (1998).

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