![]() Precipitation was found to be more important for PAR of Alnus glutinosa-type than temperature. Wetness and warmth in general were found to enhance PAR of Salix. Cool summers, in contrast, increase the PAR of Abies, Alnus viridis and Gramineae in the following year, while wet summers promote PAR of Quercus and Gramineae. Summer warmth was found to enhance the following year’s PAR of Picea, Pinus non- cembra, Larix and Fagus. Results shared by a number of regions can be summarized as follows. ![]() Most PAR/climate relationships were found to differ both among pollen types and among regions, the latter probably due to differences among the study regions in the habitats of plant populations. Climate data are monthly temperature and precipitation measured at nearby stations, and their averages over all possible 2- to 6-month windows falling within the 20-month window ending with August, just prior to the yearly pollen-trap collection. Pollen data are PAR summarized per region (4–7 traps selected per region) for each pollen type (9–14 per region) using log-transformed, detrended medians. We calculated correlations between pollen data and climate. The time-series are 10–16 years long, all ending in 2007. ![]() ![]() Annual PAR (pollen accumulation rates grains cm −2 year −1) were studied with modified Tauber traps situated in ten regions, in Poland (Roztocze), the Czech Republic (two regions in Krkonoše, two in Šumava), Switzerland (4 regions in the Alps), and Georgia (Lagodekhi). ![]()
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