Pinto-Gomes, Carlos, Department of Landscape, Environment and Planning, School of Science and Technology, University of Évora (Portugal),Rua Romão Ramalho, no.59, 7000-671 Évora, Portugal; MED - Mediterranean Institute for Agriculture, Environment and Development, Pólo da Mitra, Universidade deÉvora, 7006-554 Évora, Portugal