1. NERC Centre for Ecology and Hydrology; Benson Lane Wallingford Oxfordshire OX10 8BB UK
2. Evolution and Ecology Research Centre; School of Biological, Earth and Environmental Sciences; University of New South Wales; Sydney NSW 2052 Australia
3. Institute of Ecology and Earth Sciences; University of Tartu; Lai 40 51005 Tartu Estonia
4. Institute of Botany; Czech Academy of Sciences; Dukelská 135 37982 Třeboň Czech Republic
5. Wolfson Centre for Mathematical Biology; Mathematical Institute; Radcliffe Observatory Quarter; Woodstock Road Oxford OX2 6GG UK
6. Lactuca: Environmental Data Analyses and Modelling; 1112NC Diemen The Netherlands