1. ICHN, Delegació de la Serralada Litoral Central, Mataró, Catalonia, Spain
2. CREAF, Cerdanyola del Vallès, Barcelona, Catalonia, Spain
3. Department of Environmental Sciences, Faculty of Sciences, University of Girona, Girona, Catalonia, Spain
4. CSIC, Global Ecology Unit, CREAF-CSIC-UAB, Cerdanyola del Vallès, Barcelona, Catalonia, Spain
5. Department of Ecology, University of Barcelona, Barcelona, Catalonia, Spain
6. Centre of Excellence PLECO (Plant and Vegetation Ecology), Department of Biology, University of Antwerp, Wilrijk, Belgium