[1] Univ Antwerp, Dept Biol, B-2610 Antwerp, Belgium
[2] Aalto Univ, Lab Computer & Informat Sci, Helsinki 02015, Finland
[3] Univ Tuscia, Dept Forest Sci & Environm, I-01100 Viterbo, Italy
[4] Vrije Univ Amsterdam, Dept Hydrol & Geoenvironm Sci, NL-1081 HV Amsterdam, Netherlands
[5] Max Planck Inst Biochem, D-07701 Jena, Germany
[6] Univ Helsinki, Dept Phys Sci, Helsinki 00014, Finland
[7] INRA, UR1263, EPHYSE, F-33883 Villenave Dornon, France
[8] Alterra, NL-6700 AA Wageningen, Netherlands