1. Inst. of Botany, The Czech Academy of Sciences; CZ-252 43, Průhonice Czech Republic
2. NERC Centre for Ecology and Hydrology, Benson Lane, Wallingford; Oxfordshire UK
3. Lactuca: Environmental Data Analysis and Modelling; Diemen the Netherlands
4. Wolfson Centre for Mathematical Biology, Mathematical Inst., Radcliffe Observatory Quarter, Oxford; Oxfordshire UK
5. Dept of Botany; Faculty of Science, Charles Univ.; Prague Czech Republic