1. Institute of Biological and Environmental Sciences, Cruickshank Building, University of Aberdeen, Aberdeen AB24 3UU, UK
2. INRA, UMR 1136 INRA/University Henri Poincaré, Interactions Arbres/Micro‐organismes, Centre de Nancy, 54280 Champenoux, France
3. Hawkesbury Institute for the Environment, University of Western Sydney, NSW, Australia