Pollen monitoring as indicator of climate change in northern Sardinia, Italy (Abstract/Poster in atti di convegno)

Type
Label
  • Pollen monitoring as indicator of climate change in northern Sardinia, Italy (Abstract/Poster in atti di convegno) (literal)
Anno
  • 2012-01-01T00:00:00+01:00 (literal)
Alternative label
  • Grazia Pellizzaro, Annalisa Canu, Bachisio Arca, Arnoldo Vargiu (2012)
    Pollen monitoring as indicator of climate change in northern Sardinia, Italy
    in 5th European Symposium on Aerobiology, Cracovia, Polonia, 3-7 September 2012
    (literal)
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  • Grazia Pellizzaro, Annalisa Canu, Bachisio Arca, Arnoldo Vargiu (literal)
Pagina inizio
  • 174 (literal)
Pagina fine
  • 174 (literal)
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  • 9 (literal)
Rivista
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  • 1 (literal)
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  • 2-3 (literal)
Note
  • Abstract (literal)
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  • (1) CNR - IBIMET, Institute of Biometeorology, National Research Council, Sassari, Italy (2) Osservatorio Aerobiologico SS 1, Sassari, Italy, (literal)
Titolo
  • Pollen monitoring as indicator of climate change in northern Sardinia, Italy (literal)
Abstract
  • Airborne pollen is responsible for several allergic diseases. Prediction of the start of the pollen season is particularly important for optimizing the effectiveness of medical treatment in allergic people and in airborne pollen allergies prevention. Airborne pollen concentration pattern is related to the release of pollen from anthers, and it reflects flowering phases. Timing of phenological events, especially flowering phase, is mainly affected by meteorological factors. Although other factors, e.g. day-length and soil type, also determine the start timing of phenological events, however, temperature is one of the most important explaining variables. Given this strong relation, climatic warming should thus also be evident in long-term phenological observation series. Moreover, links between climate and the start of processes like flowering need to be better investigated. The main objective of this work is to verify whether airborne pollen data of some Mediterranean families could be used as indicator of climate change in Mediterranean areas. To this aim a long term dataset of pollen concentration relative to Oleaceae, Graminaceae and Pinaceae families, which represent the most widespread allergenic species in Mediterranean environment, was used for assessing the relationship between airborne pollen pattern and climate variability in a study area located in Northern Sardinia, Italy. Daily pollen concentration data for three families (Oleaceae, Graminaceae, and Pinaceae) were measured from 1984 to 2010 in a urban area of northern Sardinia (Italy) using a Burkard seven-day recording volumetric spore trap. The date of the full flowering phase for each families was defined as the day when the cumulated daily pollen values reached the 50 % of the total annual pollen concentration. Daily maximum and minimum temperature values were recorded during the same period by an automatic weather station. Cumulative Degree days were calculated, for each year, from different starting dates using the daily averaging method. Trends of full flowering dates for each family and of °D accumulation over the two decades were analyzed. Two-years running means were calculated. A linear regression model was used for the trend analysis. The full flowering dates, based on percentages of total pollen emission, showed a significant decreasing trend for all three families examined. These results are in accordance with those found by other authors who observed a trend towards earlier beginning of pollination for many species in Europe. The results suggest the hypothesis that during the studied years phenological trends observed for the three families examined were probably linked to temperature values recorded during the periods preceding the flowering dates. The negative trend of the starting dates values could be a response to rising spring temperature. Airborne pollen of the examined families is sensitive to spring thermal variation and could be taken into consideration as bioindicator of changes in air temperature. In addition measurements of airborne pollen may be a complement of existing direct phenological observations and provide valuable information about the impacts of climate change on flowering phases of this group of species. (literal)
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