About the Authors
Institut für Bienenkunde, Department of Biological Science, Goethe-University, Frankfurt am Main, Germany
BEEgroup, Biocentre, University of Würzburg, Würzburg, Germany
The authors have declared that no competing interests exist.
Conceived and designed the experiments: CWS. Performed the experiments: CWS. Analyzed the data: CWS SF. Contributed reagents/materials/analysis tools: BG JT. Wrote the paper: CWS.