Abstract
We present long-term (1993–2010) monitoring results of lichens from a remote site in Austria. Whereas gaseous pollution is negligible in this area, levels of long-range air pollution of S and N via rain and fog are high. Lichen cover on tree trunks have decreased significantly. Accordingly, we found that the population of all species had declined. The analyses demonstrated significant changes in lichen community composition. The lichen flora suffered a significant decrease in diversity. Our hypothesis is that the breakdown of epiphytic lichens is mainly due to eutrophication through long-term N deposition, and more particularly to ammonia in precipitation and in fog. Since many areas in the European Alps receive high wet deposition loads, a decrease in the abundance and diversity of epiphytic lichens is most probably a widespread phenomenon.
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