1. Swiss Federal Institute for Forest, Snow and Landscape Research WSL, Insubric Ecosystems Research Group, Switzerland
2. University of Neuchâtel, Laboratory of Soil Biology, Switzerland
3. Agroscope, Swiss Bee Research Center, Switzerland
4. Biologisches Institut für Pollenanalyse K. Bieri GmbH, Switzerland
5. Federal Office of Meteorology and Climatology MeteoSwiss, Switzerland