1. University of BordeauxUMR 5805 EPOC Talence Cedex France
2. Institute of Botany The Czech Academy of Sciences Třeboň Czech Republic
3. Plant Ecology Group University of Tübingen Tübingen Germany
4. Bordeaux INPG&E Pessac France
5. University of Bordeaux MontaigneG&E Pessac France