Institution: | 1. Institute of Biological Sciences, University of Wales, Aberystwyth, Ceredigion, SY23 3DA, Wales, UK 2. Department of Chemistry, UMIST, PO Box 88, Sackville Street, Manchester, M60 1QD, UK 3. Centre for Ecology and Hydrology, Bangor, Deiniol Road, Bangor, LL57 2UW, UK 4. Centre for Ecology and Hydrology, Edinburgh, Bush Estate, Penicuik, EH26 OQB, UK
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