Institution: | 1.Institute of Zoology and Botany, Estonian Agricultural University, Riia 181, 51014 Tartu, Estonia e-mail: marek@zbi.ee Tel.: +372-7-428619, Fax:+372-7-383013,Estonia;2.University of Tartu, Institute of Botany and Ecology, Lai 40, 51005 Tartu, Estonia,Estonia;3.Ume? University, Department of Ecology and Environmental Science, 901 87 Ume?, Sweden,Sweden |