1. Advancing Systems Analysis Program, International Institute of Applied Systems Analysis (IIASA) , Laxenburg , Austria
2. Mathematical Institute, Leiden University , Leiden , The Netherlands
3. Institute of Biology, Leiden University , Leiden , The Netherlands
4. Netherlands Centre for Biodiversity , Naturalis, Leiden , The Netherlands
5. Complexity Science and Evolution Unit, Okinawa Institute of Science and Technology Graduate University (OIST) , Onna , Japan
6. Faculty of Mathematics, Natural Sciences and Information Technologies, University of Primorska , Koper , Slovenia