1. Centro Nacional del Medio Ambiente, Universidad de Chile, Avenida Larrain 9975, La Reina, Santiago, Chile
2. Departamento de Ecología, Facultad de Ecología y Recursos Naturales, Universidad Andres Bello, Santiago, Chile
3. Animal Ecology, Department of Ecology and Genetics, Uppsala University, Uppsala 75236, Sweden
4. Department of Aquatic Ecology, Eawag, Überlandstrasse 133, 8600 Dübendorf, Switzerland
5. Department of Animal and Plant Sciences, University of Sheffield, Western Bank, Sheffield S10 2TN, UK