1. Faculty of Environment, Design and Therapy, Nürtingen – Geislingen University, Nürtingen, Germany
2. Grootbos Nature Reserve, Grootbos Foundation, Gansbaai, South Africa
3. Centre for Invasion Biology, Department of Botany and Zoology, Stellenbosch University, Matieland, South Africa
4. Department of Invasion Ecology, Institute of Botany, The Czech Academy of Sciences, Průhonice, Czech Republic