[1] Univ Clermont Auvergne, CNRS, GEOLAB, F-63000 Clermont Ferrand, France
[2] LTSER Zone Atelier Loire, F-37000 Tours, France
[3] UCA PARTNER, Ctr Imagerie Cellulaire Sante, F-63000 Clermont Ferrand, France
[4] Syndicat Mixte Parc Nat Reg Volcans Auvergne, 5 Pl lHotel Ville, F-15300 Murant, France
[5] Meise Bot Garden, Res Dept, Nieuwelaan 38, B-1860 Meise, Belgium
[6] Univ Antwerp, Dept Biol, ECOSPHERE, Univ Plein 1, B-2610 Antwerp, Belgium
[7] Luxembourg Inst Sci & Technol LIST, Observ Climate Environm & Biodivers OCEB, Environm Res & Innovat Dept ERIN, 41 Rue Brill, L-4422 Belvaux, Luxembourg