1. Instituto Politécnico Nacional, CIIDIR‐Oaxaca, Hornos 1003, Xoxocotlan Oaxaca Mexico
2. Graduate Student, Master of Science in Natural Resource ConservationInstituto Politécnico Nacional, CIIDIR‐Oaxaca, Hornos 1003, Xoxocotlan Oaxaca Mexico
3. Campo Experimental Bajío‐INIFAP. Carretera Celaya‐San Miguel de Allende, km 6.5. Celaya Guanajuato México