Klaus Henle1, Erik Gawel2, Irene Ring2, Sebastian Strunz2. 1. Department of Conservation Biology, UFZ-Helmholtz Centre for Environmental Research, Permoserstr. 15, 04318, Leipzig, Germany. 2. Department of Economics, UFZ-Helmholtz Centre for Environmental Research, Permoserstr. 15, 04318, Leipzig, Germany.