1. Institute of Biodiversity and Ecosystem Research, Bulgarian Academy of Sciences, 23 Acad. Georgi Bonshev str., 1113 Sofia, Bulgaria,
2. Disturbance Ecology, Bayreuth Center of Ecology and Environmental Research (BayCEER), University of Bayreuth, Universitatsstr. 30, 95447 Bayreuth, Germany
3. Synthesis Centre (sDiv), German Centre for Integrative Biodiversity Research (iDiv) Halle-Jena-Leipzig, Deutscher Platz 5e, 04103 Leipzig, Germany
4. Phytogeography and Applied Geobotany, Dipartimento DATA, “Sapienza” Universita di Roma, Via Flaminia 72, 00196 Roma, Italy
5. Departamento de Biologia Vegetal II, Facultad de Farmacia, Universidad Complutense, 28040 Madrid, Spain
6. School of Biology, Aristotle University of Thessaloniki, P. O. Box 104, 54124, Greece