1. Research Group of Plant and Vegetation Ecology, Department of Biology, University of Antwerp, Universiteitsplein 1, 2610 Wilrijk, Belgium
2. Earth and Life Institute, Université catholique de Louvain, Croix du Sud 2/9, 1348 Louvain, Belgium
3. Department of Earth and Environmental Sciences, Katholieke Universiteit Leuven, Celestijnenlaan 200E, Box 2411, 3001 Louvain, Belgium
4. Royal Meteorological Institute of Belgium, Avenue Circulaire 3, 1780 Brussels, Belgium