[1] Columbia Univ, Columbia Business Sch, New York, NY 10027 USA
[2] CSIRO, Canberra, ACT, Australia
[3] Princeton Univ, Dept Ecol & Evolutionary Biol, Princeton, NJ 08544 USA
[4] Stanford Univ, Dept Sci Biol, Stanford, CA 94305 USA
[5] Univ Cambridge, Fac Econ, Cambridge, England
[6] Beijer Inst Ecol Econ, Stockholm, Sweden
[7] Stanford Univ, Dept Econ, Stanford, CA 94305 USA
[8] Univ Stockholm, Dept Syst Ecol, Stockholm, Sweden
[9] Oregon State Univ, Dept Zool, Corvallis, OR 97331 USA