1. Department of Statistics, University of California, Davis, One Shields Avenue, Davis, CA 95616, USA
2. Department of Entomology, University of California, Davis, One Shields Avenue, Davis, CA 95616, USA
3. Max Planck Institute for Demographic Research, Doberaner Strasse 114, D-18057 Rostock, Germany
4. El Colegio de la Frontera Sur, Carreterra Antiguo Aeropuerto, Tapachula, ChiapasMexico