1. Department of Biology; University of Massachusetts at Amherst; Amherst Massachusetts 01003 USA
2. Royal Botanic Gardens, Kew; Richmond Surrey TW9 3AB United Kingdom
3. Department of Plant Protection Biology; Swedish University of Agricultural Sciences; SE-23053 Alnarp Sweden
4. Department of Bioscience; University of Salzburg; Hellbrunnerstrasse 34 5020 Salzburg Austria
5. Department of Applied Ecology; North Carolina State University; Raleigh North Carolina 27695 USA
6. University of Greenwich; Medway ME4 4 TB United Kingdom