2018 ) while the amount of pollen registered from herbaceous species, for instance grasses and nettles, shows a decreasing trend (Hoebeke et al. 2018 ; Rojo et al. 2021 ).
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Pollen season variations among anemophilous species in an Atlantic-influenced mediterranean environment: a long term study (1993-2022).
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The sentences
By contrast, a highly significant correlation can be detected among the herbaceous taxa between hours of insolation and rainfall and the pollen concentration.
In the case of rainfall, a negative trend can be detected over the years, especially in the case of autumn, albeit not significant.
Six of the eight woody taxa studied showed a significant trend towards increased pollen concentration, some of which are associated with temperature in previous seasons.
The calculation of the trends for both the aerobiological and meteorological parameters was conducted using the Mann-Kendall test and the Theil-Sen estimator (positive Theil-Sen values indicate an increasing trend), as these statistical tools are considered more robust for heterogeneous time series data.
This finding shows that, despite being a location close to the ocean, where the buffering effect of the body of water plays an essential role, the effects of climate change on pollen concentration are significant, especially for certain taxa such as Pinus and Platanus (both of which display a positive trend for SPIn, and a correlation of this parameter with the temperature of previous seasons).