1. Leibniz-Institute of Freshwater Ecology and Inland Fisheries (IGB); Müggelseedamm 310 12587 Berlin Germany
2. Department of Biology, Chemistry, Pharmacy; Institute of Biology; Freie Universität Berlin; Königin-Luise-Str. 1-3 14195 Berlin Germany
3. Berlin-Brandenburg Institute of Advanced Biodiversity Research (BBIB); Altensteinstr. 34 14195 Berlin Germany
4. Department of Ecology and Ecosystem Management, Restoration Ecology; Technische Universität München; Emil-Ramann-Str. 6 85354 Freising Germany
5. NERC Centre for Ecology and Hydrology; Benson Lane Crowmarsh Gifford Wallingford Oxfordshire OX10 8BB UK
6. GB Non-Native Species Secretariat; Animal and Plant Health Agency; Sand Hutton York YO41 1LZ UK
7. Institute for Environmental Protection and Research (ISPRA); Via Vitaliano Brancati 44 00144 Roma Italy
8. Department of Biology II; Ludwig-Maximilians-Universität München; Großhaderner Str. 2 82152 Planegg-Martinsried Germany
9. Institute for Environmental Protection and Research (ISPRA); Via Vitaliano Brancati 48 00144 Roma Italy
10. Chair IUCN SSC Invasive Species Specialist Group; Roma Italy
11. Bio-Protection Research Centre; Lincoln University; PO Box 85084 Lincoln 7647 Canterbury New Zealand
12. School of Biological Sciences; Centre for Biodiversity and Biosecurity; University of Auckland; P.B. 92019 Auckland 1142 New Zealand
13. Programme Officer IUCN SSC Invasive Species Specialist Group; Auckland New Zealand
14. Institute of Botany; Department of Invasion Ecology; The Czech Academy of Sciences; CZ-252 43 Průhonice Czech Republic