Stapper, N. J., I. Franzen-Reuter & J. P. Frahm 2011: Epiphytic lichens as indicators of climate changes in the Düsseldorf area. - Gefahrstoffe Reinhaltung der Luft 71(4): 173-178. [RLL List # 223 / Rec.# 32996] Abstract: Epiphytic lichens with temperate mediterranean or subatlantic mediterranean distribution in Europe are used as indicator organisms for climate changes (abridged "climate change indicators") in the Düsseldorf area (Germany). The data presented in this study have been collected during several lichen mapping projects, in all of which the phorophytes were selected according to guideline VDI 3957 Part 13. The proportion of climate change indicators on the phorophytes' lichen species spectrum is used here as a measure of the climatic conditions at the tree location. It is highest along the Rhine valley and in areas with high annual precipitation close to the eastern boarder of the warmest parts of North Rhine-Westphalia, e.g. the Western slope of the Bergisches Land. In Düsseldorf and environs, between 2001 and 2010, frequency of climate change indicators has increased significantly.
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