1. Université Clermont Auvergne; Université Blaise Pascal; GEOLAB BP 10448 63000 Clermont-Ferrand France
2. CNRS; UMR 6042; GEOLAB - Laboratoire de géographie physique et environnementale; 63057 Clermont-Ferrand France
3. Department of Geography; King's College London; London WC2R 2LS UK
4. Institute of Biology and Environmental Science; Carl von Ossietzky University Oldenburg; Carl-von-Ossietzky-Strasse 9-11 D-26129 Oldenburg Germany
5. Royal Netherlands Institute for Sea Research (NIOZ); Post Box 140 4400 AC Yerseke The Netherlands
6. Université de Toulouse; INP; UPS; 118 Route de Narbonne 31062 Toulouse France
7. CNRS; UMR 5245; ECOLAB - Laboratoire Ecologie Fonctionnelle et Environnement; 31062 Toulouse France
8. Department of Biological Sciences; University of Denver; F. W. Olin Hall 2190 E. Iliff Avenue Denver CO 80208-9010 USA
9. School of Geography; Queen Mary University of London; E1 4NS UK
10. Department of Geography; University of Kentucky; Lexington KY 40506 USA