[1] Univ Cambridge, Dept Plant Sci, Forest Ecol & Conservat Grp, Cambridge CB2 3EA, England
[2] Swiss Fed Inst Forest Snow & Landscape Res WSL, CH-8903 Birmensdorf, Switzerland
[3] Univ Ghent, Forest & Nat Lab, Dept Environm, Fac Biosci Engn, Melle Gontrode, Belgium
[4] Univ Picardie Jules Verne, UR Ecol & Dynam Syst Anthropises, EDYSAN, CNRS,UMR 7058, F-80037 Amiens 1, France
[5] Friedrich Schiller Univ Jena, Inst Ecol & Evolut, D-07743 Jena, Germany
[6] Czech Acad Sci, Inst Bot, CZ-60200 Brno, Czech Republic
[7] Palacky Univ, Dept Bot, Fac Sci, CZ-78371 Olomouc, Czech Republic
[8] Univ Sopron, Inst Environm & Earth Sci, H-9400 Sopron, Hungary
[9] Swedish Univ Agr Sci, Southern Swedish Forest Res Ctr, Box 49, S-23053 Alnarp, Sweden
[10] Res Inst Nat & Forest INBO, B-1000 Brussels, Belgium
[11] Environm Agcy Austria, A-1090 Vienna, Austria
[12] Univ Rzeszow, Dept Plant Physiol & Ecol, PL-35959 Rzeszow, Poland
[13] Univ Potsdam, Gen Bot, Insitute Biochem & Biol, D-14469 Potsdam, Germany
[14] Univ Warsaw, Bialowieza Geobot Stn, Fac Biol, PL-17230 Bialowieza, Poland
[15] Czech Acad Sci, Inst Bot, CZ-25243 Pruhonice, Czech Republic
[16] Czech Univ Life Sci Prague, Fac Forestry & Wood Sci, CZ-16521 Prague 6, Czech Republic
[17] Tech Univ Zvolen, Fac Forestry, SK-96001 Zvolen, Slovakia
[18] Natl Forest Ctr, SK-96001 Zvolen, Slovakia
[19] Univ Wroclaw, Fac Biol Sci, Dept Bot, Wroclaw, Poland
[20] Leibniz Ctr Agr Landscape Res ZALF, D-15374 Muencheberg, Germany
[21] Univ Ljubljana, Biotech Fac, Dept Forestry & Renewable Forest Resources, Ljubljana 1000, Slovenia
[22] Univ Pecs, Inst Biol, Dept Hydrobiol, H-7624 Pecs, Hungary
[23] Univ Agr, Dept Forest Biodivers, Fac Forestry, Krakow, Poland
[24] Univ Wroclaw, Inst Environm Biol, Dept Bot, PL-50328 Wroclaw, Poland
[25] Univ Gottingen, Dept Silviculture & Forest Ecol Temperate Zones, Gottingen, Germany
[26] Eotvos Lorand Univ, Inst Biol, Dept Plant Systemat Ecol & Theoret Biol, H-1117 Budapest, Hungary
[27] Univ Wroclaw, Museum Nat Hist, PL-50335 Wroclaw, Poland
[28] Univ Pecs, Inst Reg Dev, H-7100 Szekszard, Hungary
[29] Univ Debrecen, Dept Ecol, H-4032 Debrecen, Hungary