Acknowledgements
This work was supported by the National Socio-Environmental Synthesis
Center (SESYNC) under funding received from the National Science
Foundation (DBI-1052875 and 1119891) and by the Helmholtz Centre for
Environmental Research (Research School ESCALATE, VH-KO-613), the German
Federal Ministry of Education and Research (GLUES, 01LL0901A), the
Martin-Luther-University Halle-Wittenberg and the Synthesis Centre
(sDiv) of the German Centre for Integrative Biodiversity Research (iDiv)
Halle-Jena-Leipzig (DFG FZT 118).