1. Environmental Science, Policy & Management; University of California at Berkeley; 130 Mulford Hall; Berkeley; CA; 94720-3114; USA
2. Ecology, Evolution and Organismal Biology; Iowa State University; 133 Bessey Hall; Ames; IA; 50011; USA
3. Department of Biology; Stanford University; 371 Serra Mall; Stanford; CA; 94305-5020; USA
4. Plants, Soils and Climate Department; Utah State University; Agricultural Science 322; Logan; UT; 84322; USA
5. Department of Integrative Biology; University of Guelph; Guelph; ON; N1G 2W1; Canada
6. Netherlands Institute of Ecology; Department of Terrestrial Ecology; Wageningen University and Research Centre; Laboratory of Nematology; PO Box 8123; 6700 ES; Wageningen; The Netherlands