Effects of meteorological factors on airborne bracken (<Emphasis Type="Italic">Pteridium aquilinum</Emphasis> (L.) Kuhn.) spores in Salamanca (middle-west Spain) |
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Authors: | David Rodríguez de la Cruz Estefanía Sánchez Reyes José Sánchez Sánchez |
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Institution: | (1) Department of Botany, Hispano-Luso Agrarian Research Center (C.I.A.L.E.), University of Salamanca, Campus Miguel de Unamuno s/n, 37007 Salamanca, Spain |
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Abstract: | Temporal variation of airborne bracken (Pteridium aquilinum) spores concentration in Salamanca during 10 years from January 1998 to December 2007 were studied by using a Burkard spore
trap, and correlations with some meteorological parameters were analyzed. The number of spores that were counted was very
low, due probably to the distance between the spore trap and the main bracken populations which were located 70 km away from
the city. Long-range transport caused by winds coming from the Second Quadrant (IIQ) is supposed to be responsible for the
appearance of bracken spores in Salamanca. The season period from August to late October shows the most intense spore dispersal
process, with an early morning distribution along the day. Years 2002 and 2007 with a low quantity of airborne spores were
also characterized by low mean temperatures, always under 18°C from May to June. Daily spore concentration shows positive
correlation with temperature and sun hours but negative with IVQ winds and with relative humidity. No correlation between
daily spore concentration and rainfall was found. Also, a positive correlation between number of spores and IIQ winds was
observed during the main spore season (MSS) and prepeak period (PRE). |
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Keywords: | Bracken Meteorology Pteridium Spores Salamanca Spain |
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