Affiliation: | (1) Section of Ecology, Department of Biology, University of Turku, 20014 Turku, Finland;(2) Netherlands Institute of Ecology (NI00-KNAW), Post Office Box 40, 6666 ZG Heteren, The Netherlands;(3) Finnish Forest Research Institute, Rovaniemi Research station, P.O. Box 16, 96301 Rovaniemi, Finland |