[1] Univ Giessen, Dept Anim Ecol, D-35392 Giessen, Germany
[2] Univ Calif Berkeley, Dept Environm Sci Policy & Management, Berkeley, CA 94720 USA
[3] Queen Mary Univ London, Sch Biol Sci, London E1 4NS, England
[4] Univ Georgia, Athens, GA 30602 USA
[5] Univ Paris 06, ORSTOM, Lab Ecol Sols Trop, F-93143 Bondy, France
[6] Netherlands Inst Ecol, Ctr Terr Ecol, NL-6666 ZG Heteren, Netherlands
[7] Univ Utrecht, Dept Environm Studies, NL-3508 TC Utrecht, Netherlands
[8] Acad Sci Czech Republ, Inst Soil Biol, CR-37005 Ceske Budejovice, Czech Republic
[9] Colorado State Univ, Nat Resource Ecol Lab, Ft Collins, CO 80523 USA
[10] Landcare Res, Lincoln, New Zealand
[11] Univ Wageningen & Res Ctr, Dept Environm Sci, NL-6700 EC Wageningen, Netherlands
[12] Macquarie Univ, Sch Biol Sci, Ctr Biodivers & Bioresources, Sydney, NSW 2109, Australia
[13] CABI Biosci UK Ctr, Ascot SL5 7TA, Berks, England
[14] Univ Zimbabwe, Dept Soil Sci & Agr Engn, Harare, Zimbabwe
[15] Western Washington Univ, Dept Biol, Bellingham, WA 98225 USA
[16] Univ Buenos Aires, Dept Ecol, RA-1417 Buenos Aires, DF, Argentina
[17] Michigan State Univ, Ctr Microbial Ecol, E Lansing, MI 48824 USA
[18] Netherlands Inst Ecol, Ctr Terr Ecol, NIOO, CTO, NL-6666 ZG Heteren, Netherlands