1. Plant Ecology & Nature Conservation Institute of Biology & Chemistry University of Hildesheim Hildesheim Germany
2. Plant Ecology Group Institute of Evolution and Ecology University of Tübingen Tübingen Germany
3. Biodiversity and Ecosystem Research Institute of Landscape Ecology University of Münster Münster Germany
4. Senckenberg Centre for Human Evolution and Palaeoenvironment, and Department of Geosciences, Biogeology University of Tübingen Tübingen Germany
5. Plant Molecular Ecology Institute of Botany University of Cologne Cologne Germany