1. Department of Life Sciences; Natural History Museum; London SW7 5BD UK
2. Department of Life Sciences; Imperial College London; Ascot SL5 7PY UK
3. Zoological Museum; University of Kiel; Kiel Germany
4. Wageningen Environmental Research (Alterra); Wageningen P.O. Box 47, 6700 AA The Netherlands
5. CSIRO Land and Water; Canberra ACT 2601 ACT Australia
6. Centre for Agri-Environmental Research; School of Agriculture, Policy and Development; The University of Reading; Reading RG6 6AR UK
7. Helmholtz Centre for Environmental Research-UFZ; Department of Community Ecology; 06120 Halle Germany