1 Grupo de Ecoloxía Animal (GEA), Universidade de Vigo, E-36310, Vigo, Spain. mariagomez@uvigo.es.
2 Department of Microbiology, University of Innsbruck, Technikerstraβe 25, A-6020, Innsbruck, Austria. mariagomez@uvigo.es.
3 Department of Microbiology, University of Innsbruck, Technikerstraβe 25, A-6020, Innsbruck, Austria.
4 Department of Plant and Microbial Biology, University of California at Berkeley, Berkeley, CA, 94720, USA.
5 Dipartimento di Scienze e Tecnologie Agrarie, Alimentari, Ambientali e Forestali (DAGRI), University of Florence, Piazzale delle Cascine 18, I-50144, Florence, Italy.
6 Council for Research and Experimentation in Agriculture (CREA-ZA), Via A. Lombardo 11, I-26900, Lodi, Italy.
7 Department of Geography, University of Zürich, Winterthurerstraße 190, CH-8057, Zürich, Switzerland.