Affiliation: | Research Group, Plant and Vegetation Ecology, Department of Biology, University of Antwerp, Campus Drie Eiken, Universiteitsplein 1, B-2610 Wilrijk, Belgium,;Arctic Station, University of Copenhagen, 3953 Qeqertarsuaq, Greenland, and;Research Group, Polar Ecology, Limnology and Paleobiology, Department of Biology, University of Antwerp, Campus Middelheim, Groenenborgerlaan 171, B-2020 Antwerp, Belgium |