1. Donghu Experimental Station
of Lake Ecosystems, State Key Laboratory for Freshwater Ecology and
Biotechnology of China, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, PR China
2. School of Geography, University of Southampton, University Road, Southampton,
SO17 1BJ, U.K.
3. Environmental Change Research
Centre, Department of Geography, University College London, London, WC1E 6BT, U.K.