1. Institute for Chemistry and Biology of the Marine Environment; University of Oldenburg; Carl-von-Ossietzky Straße 9-11 Oldenburg Germany
2. Division of Conservation, Landscape and Vegetation Ecology; University of Vienna; Rennweg 14 1030 Vienna Austria
3. Department of Biological Diversity and Nature Conservation; Environment Agency; Spittelauer Laende 5 1090 Vienna Austria
4. Centre for Invasion Biology; Department of Botany and Zoology; Stellenbosch University; Private Bag X1 Matieland 7602 South Africa
5. Ecology; University of Konstanz; Universitätsstrasse 10 78457 Konstanz Germany
6. Facultad de Ciencias Forestales; Instituto de Ecología y Biodiversidad; Universidad de Concepcion; Victoria 631 403000 Concepcion Chile
7. Institute of Botany; Department of Invasion Ecology; The Czech Academy of Sciences; Zámek 1, CZ-252 43 Průhonice Czech Republic
8. Department of Ecology; Faculty of Science; Charles University in Prague; Viničná 7 CZ-128 44 Prague Czech Republic
9. Institute of Biochemistry and Biology; University of Potsdam; Maulbeerallee 1 D-14469 Potsdam Germany
10. German Centre for Integrative Biodiversity Research (iDiv); Halle-Jena-Leipzig; Deutscher Platz 5e 04103 Leipzig Germany