1. Inst. of Forest Ecology, Dept of Soil and Forest Sciences, BOKU – Univ. of Natural Resources and Life Sciences Vienna Austria
2. Inst. of Wildlife Biology and Game Management, Dept of Integrative Biology and Biodiversity Research, BOKU – Univ. of Natural Resources and Life Sciences Vienna Austria
3. Dept of Botany and Nature Conservation, Forest Biodiversity Inst., Univ. of Agriculture Kraków Poland
4. Cary Inst. of Ecosystem Studies Millbrook NY USA