1. Parmenides Center for the Conceptual Foundations of Science; 82049 Pullach/Munich Germany
2. Department of Plant Systematics, Ecology and Theoretical Biology; Institute of Biology, Eötvös Loránd University; 1117 Budapest Hungary
3. Evolutionary Systems Research Group; MTA Centre for Ecological Research; 8237 Tihany Hungary
4. Theoretical Biology, Department of Biology; Utrecht University; 3584 CH Utrecht The Netherlands
5. Institute of Integrative Biology; Department of Environmental Systems Science, ETH Zurich; 8092 Zurich Switzerland