1. Université Clermont Auvergne, CNRS, GEOLAB – F-63000 Clermont-Ferrand, France.
2. Université Paul Sabatier, CNRS/IRD, GET – F-31062 Toulouse, France.
3. CNRS, ECOLAB, Université Paul Sabatier, CNRS, INPT, UPS, F-31062 Toulouse, France.
4. School of Geography and the Environment, University of Oxford, Oxford, United Kingdom.