1. Geography Department, Faculty of Social Sciences and Humanities, Autonomous University of San Luis Potosi, San Luis Potosí, México
2. Center of Environmental Geography, National Autonomous University of Mexico, Morelia, México
3. Anthropolgy Department, Faculty of Social Sciences and Humanities, Autonomous University of San Luis Potosi, San Luis Potosí, México
4. Departament of Geography, National University of Costa Rica, Heredia, Costa Rica