1. Salmon & Freshwater Team, Cefas-Lowestoft, Pakefield Road, Lowestoft, Suffolk NR33 OHT, U.K.;
2. Centre for Conservation Ecology & Environmental Change, Bournemouth University, Poole, Dorset BH12 5BB, U.K.;
3. Department of Environmental Sciences, University of Girona, Girona 17071, Spain;
4. Environmental Change Research Centre, Department of Geography, University College London, Pearson Building, Gower Street, London, WC1E 6BT, U.K.;
5. Environmental and Life Sciences Graduate Program, Trent University, Peterborough, Ontario K9J 7B8, Canada