1. Department of Ecology, University of Barcelona, Diagonal, 645, 08028-Barcelona, Catalonia, Spain
2. Department of Mathematical Sciences, University of Liverpool, Liverpool L69 3BX, United Kingdom
3. UMR5805, Laboratoire d'Ecophysiologie et Ecotoxicologie des Systèmes Aquatiques, Université Bordeaux 1 & CNRS, Place du Dr. Peyneau, 33120 Arcachon, France
4. Environmental Change Research Centre, University College London, 26, Bedford Way, London WC1H 0AP, United Kingdom