1. Department for Ecosystem Research and Monitoring; Environment Agency Austria; Spittelauer Lände 5 A-1090 Vienna Austria
2. Department of Aquatic Sciences and Assessment; Swedish University of Agricultural Sciences; Box 7050 SE 750 07 Uppsala Sweden
3. Friedrich-Schiller-University Jena; Institute of Ecology; Dornburger Str. 159 07743 Jena Germany
4. National Park Bayrischer Wald; Freyungerstr. 2 D-94481 Grafenau Germany
5. School of Environmental Sciences; University of Camerino; Via Pontoni 5 I - 62032 Camerino Italy
6. Finnish Environment Institute; P.O. Box 140 00251 FI-Helsinki Finland
7. Federal Research and Training Centre for Forests; Natural Hazards and Landscape (BFW); Seckendorff-Gudent-Weg 8 A-1131 Vienna Austria
8. Corpo Forestale dello Stato; Devision Forest Monitoring; Via Carducci, 5 I- 00187 Roma Italy
9. Finnish Forest Research Institute; Box 18 FI-01301 Vantaa Finland
10. Institute for Ecology of Industrial Areas; Kossutha 6 40-844 Katowice Poland
11. Faculty of Biology and Environmental Protection; Silesian University; Jagiellońska 28 40-032 Katowice Poland