1 GRAM (Grup de Recerca Ambiental Mediterrània), Department of Geography, University of Barcelona, Montalegre, 6, 08001 Barcelona, Spain. Electronic address: asantasusagna@ub.edu.
2 GRAM (Grup de Recerca Ambiental Mediterrània), Department of Geography, University of Barcelona, Montalegre, 6, 08001 Barcelona, Spain.