1. Cornell Lab of Ornithology; Ithaca NY 14850 USA
2. Department of Ecology, Evolution, and Natural Resources, Rutgers; The State University of New Jersey; New Brunswick NJ 08901 USA
3. Department of Resource Management and Geography; The University of Melbourne; 500 Yarra Blvd Richmond VIC 3070 Australia
4. Australian Research Centre for Urban Ecology; Royal Botanic Gardens Melbourne; c/o School of Botany; The University of Melbourne; Melbourne VIC 3010 Australia
5. Environmental Biology Department; Sapienza University; Piazzale Moro 5 I-00185 Rome Italy
6. Unit of Environmental Sciences and Development; North-West University; Potchefstroom South Africa
7. Centre for Biodiversity and Ecology Research; Department of Biological Sciences; The University of Waikato; Hamilton 3240 New Zealand
8. Friesner Herbarium and Center for Urban Ecology; Butler University; Indianapolis IN 46208 USA
9. The Morton Arboretum; Lisle IL 60532 USA
10. Department of Community Ecology; Helmholtz Centre for Environmental Research - UFZ; Theodor-Lieser-Strasse 4 06120 Halle Germany
11. German Centre for Integrative Biodiversity Research (iDiv) Halle-Jena-Leipzig; Deutscher Platz 5d 04103 Leipzig Germany
12. Institute of Botany; Academy of Sciences of the Czech Republic; CZ-25243 Průhonice Czech Republic
13. Department of Ecology; Faculty of Science; Charles University Prague; Viničná 7 CZ-12843 Praha 2 Czech Republic
14. Centre for Invasion Biology; Department of Botany and Zoology; Stellenbosch University; Matieland 7602 South Africa