1. Plant Ecology and Nature Conservation Group Wageningen University PO Box 47 Wageningen 6700 AA the Netherlands
2. Department of Microbial Ecology Netherlands Institute for Ecology (NIOO‐KNAW) PO Box 50 Wageningen 6700 AB the Netherlands
3. Aad Termorshuizen Consultancy Kabeljauwallee 11 Doorwerth 6865 BL the Netherlands