1. Department of Ecology, Swedish University of Agricultural Sciences, Uppsala, Sweden.
2. Department of Soil, Plant and Food Sciences (DiSSPA-Entomology), University of Bari, Bari, Italy.
3. Agroecology, University of Göttingen, Göttingen, Germany.
4. Department of Environmental Sciences, Policy and Management, University of California, Berkeley, USA.
5. Institute for Resources, Environment and Sustainability, Biodiversity Research Center and Department of Zoology, University of British Columbia, Vancouver, Canada.
6. Plant-Soil-Interactions, Research Division Agroecology and Environment, Agroscope, Switzerland.
7. Department of Plant and Microbial Biology, University of Zürich, Zürich, Switzerland.
8. Department of Agronomy, Iowa State University, Iowa, USA.
9. Department of Forest Mycology and Plant Pathology, Swedish University of Agricultural Sciences, Uppsala, Sweden.