**Acknowledgements**

This study has been made possible through the projects "Assessment, Monitoring and Applied Scientific Research for Ecological Restoration of Gypsum Mining Concessions (Majadas Viejas and Marylen) and Spreading of Results (ECORESGYP)" sponsored by the company EXPLOTACIONES RÍO DE AGUAS S.L. (TORRALBA GROUP) and "Integrated study of coastal sands vegetation (AREVEG)" sponsored by CEI·MAR.
