[1] Univ Nacl Autonoma Mexico, Inst Invest Econ, Mexico City, DF, Mexico
[2] Univ Nacl Autonoma Mexico, Becario Programa Becas Posdoctorales, Mexico City, DF, Mexico
[3] Univ Nacl Autonoma Mexico, Ctr Reg Invest Multidisciplinarias, Mexico City, DF, Mexico
[4] Univ Nacl Autonoma Mexico, Inst Invest Econ, Mexico City, DF, Mexico
[5] Stanford Univ, Hopkins Marine Stn, Pacific Grove, CA 93950 USA
[6] Colegio Frontera ECOSUR, Dept Conservac Biodiversidad, San Cristobal de las Casa, Mexico