1. Laboratory of Soil Biology; University of Neuchâtel; CH-2000 Neuchâtel Switzerland
2. Institut des Sciences de l'Evolution; CNRS UMR 5554; Université de Montpellier II; Place Eugène Bataillon; 34095 Montpellier Cedex 5 France
3. Natural Science and Psychology; Liverpool John Moores University; Liverpool L3 3AF UK
4. Jardin Botanique de Neuchâtel; Chemin du Perthuis-du-Sault 58; CH-2000 Neuchâtel Switzerland