Nature conservation in Eastern Europe, Caucasus and Central Asia : lessons learnt from the transformation process and challenges for the future : proceedings of the expert workshop held from 29th February to 4th March 2016 at the International Academy for Nature Conservation on the Isle of Vilm, Germany / organised by the German Federal Agency for Nature Conservation (BfN) in cooperation with the Nature and Biodiversity Conservation Union (NABU) and the IUCN Regional Office for Eastern Europe and Central Asia (IUCN ECARO) ; editors Christiane Röttger, Andrea Strauss, Nils Horstmeyer