1. Agroecology, Department of Crop Sciences, University of Göttingen, Grisebachstrasse 6, 37077 Göttingen, Germany
2. Centre for Environmental and Climate Research, University of Lund, Sölvegatan 37, 22362 Lund, Sweden
3. Department of Animal Ecology and Tropical Biology (Zoology III), Biocenter, Am Hubland, University of Würzburg, 97074 Würzburg, Germany
4. Quality of Plant Products, Department of Crop Sciences, Carl-Sprengel-Weg 1, 37075 Göttingen, Germany