1 School of Biological and Chemical Sciences, Queen Mary University of London, Mile End Road, London E1 4NS, UK. Electronic address: m.evans@qmul.ac.uk.
2 Institute of Integrative and Comparative Biology, University of Leeds, Leeds LS2 9JT, UK.
3 Helmholtz Center for Environmental Research, Department of Ecological Modelling, Permoserstrasse 15, 04318 Leipzig, Germany.
4 Nederlands Institut voor Ecologie, PO Box 50, 6700 AB Wageningen, The Netherlands.
5 Department of Philosophy, School of Philosophical and Historical Inquiry, Quadrangle A14, University of Sydney, NSW, Australia.
6 School of Biological and Chemical Sciences, Queen Mary University of London, Mile End Road, London E1 4NS, UK.
7 Department of Philosophy, University of Pennsylvania, 433 Cohen Hall, Philadelphia, PA 19104, USA.