1. Above‐Belowground Interactions Group, Institute of Biology Leiden University Sylviusweg 72 2333 BE Leiden the Netherlands
2. Naturalis Biodiversity Center Darwinweg 2 2333 CR Leiden the Netherlands
3. Department of Evolutionary Biology and Environmental Studies University of Zurich CH‐8057 Zurich Switzerland
4. Department of Evolutionary and Population Biology, Institute for Biodiversity and Ecosystem Dynamics University of Amsterdam PO Box 94240 1090 GE Amsterdam the Netherlands