1. Department of Biology; San Francisco State University; San Francisco; CA; 94132; U.S.A.
2. USGS Patuxent Wildlife Research Center; 12100 Beech Forest Road; Laurel; MD; 20708; U.S.A.
3. Food and Agriculture Organization of the United Nations; Viale delle Terme di Caracalla; Rome,; 00100; Italy
4. Centre for Agri-Environmental Research (CAER); School of Agriculture, Policy and Development; University of Reading; Reading, RG6 6AR; United Kingdom
5. Department of Biology; University of Rochester; Rochester; NY; 14627; U.S.A.
6. USDA-ARS Bee Biology and Systematics Lab; Utah State University; Logan; UT; 84322; U.S.A.
7. Department of Biology; Indiana State University; Terre Haute IN 47809; U.S.A.
8. Mendel University of Agriculture and Forestry; Faculty of Forestry and Wood Technology; Zemědělská 3; CZ-61300 Brno; Czech Republic; 420 545 134 127
9. Smithsonian Tropical Research Institute; Box 0843-03092; Balboa; Ancon; Republic of Panama
10. Sevilleta LTER, Department of Biology; 167 Castetter Hall, MSC03 20201 University of New Mexico; Albuquerque; NM; 87131; U.S.A.
11. Department of Environmental Science, Policy, & Management; University of California; Berkeley; CA; 94720; U.S.A.