1. Johann Heinrich von Thünen Institute; Institute of Agricultural Climate Research; Bundesallee 50; 38116; Braunschweig; Germany
2. UCD School of Biology and Environmental Science; University College Dublin; Belfield; Dublin 4; Ireland
3. Institute of Biological and Environmental Sciences; University of Aberdeen; 23 St Machars Drive; Aberdeen; AB24 3UU; Scotland
4. Centre for Ecology and Hydrology; Bush Estate; Penicuik; EH26 0QB; UK
5. Biosystems Division; Risø National Laboratory for Sustainable Energy; Technical University of Denmark; PO Box 49; 4000; Roskilde; Denmark
6. Department of Environmental Science; University of Eastern Finland; BioTeknia 2, PO Box 1627; FI-70211; Kuopio; Finland
7. Department of Botany; School of Natural Sciences; Trinity College Dublin; Dublin 2; Ireland
8. Teagasc; Johnstown Castle Research Centre; Wexford; Ireland
9. Department of Geography; Institute of Ecology and Earth Sciences; University of Tartu; Vanemuise St. 46; 51014; Tartu; Estonia
10. Department of Agroenvironmental Science and Technology; University of Bologna; Viale Fanin 44; 40127; Bologna; Italy
11. Department of Biology; University of Antwerp; Universiteitsplein 1; BE-2610; Wilrijk; Belgium
12. Institute of Biological; Environmental and Rural Sciences; Aberystwyth University; Gogerddan; Aberystwyth; SY23 3EB; UK
13. Department of Environmental Sciences; University of Toledo; Toledo; 43606; OH; USA