1. Department of Ecology, Institute of Bioscience, University of São Paulo, 05508-900, São Paulo, SP, Brazil.
2. Department of Animal Biology, State University of Campinas, Campinas, SP, Brazil.
3. Department of Plant Biology, Biology Institute, State University of Campinas, Campinas, SP, Brazil.
4. Center of Nuclear Energy in Agriculture, University of São Paulo, Piracicaba, Brazil.
5. Program on Food Security and the Environment, Stanford University, Stanford, CA 94305, USA.
6. Department of Biological Sciences, “Luiz de Queiroz” College of Agriculture, University of São Paulo, Piracicaba, Brazil.