1 Department of Microbial Ecology, Netherlands Institute of Ecology (NIOO-KNAW), 6708 PB, Wageningen, The Netherlands.
2 Department of Microbial Ecology, Netherlands Institute of Ecology (NIOO-KNAW), 6708 PB, Wageningen, The Netherlands. p.garbeva@nioo.knaw.nl.
3 Department of Plant and Environmental Sciences, Faculty of Natural and Life Sciences, University of Copenhagen, 1871, Copenhagen, Denmark. p.garbeva@nioo.knaw.nl.