The role of pollinators for global crop production Alexandra M. Klein, Georg-August University;
Bernard E. Vaissière, Institut National de la Recherche Agronomique;
James H. Cane, USDA Agricultural Research Service;
Ingolf Steffan-Dewenter, University of Würzburg;
Saul Cunningham, CSIRO;
Claire Kremen, University of British Columbia;
Teja Tscharntke, Georg-August-University Göttingen