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Grateful acknowledgement is made to the following sources for permission to reproduce material in this unit:
Figures 1.1, 1.2, 1.3, 1.10, 2.4, 2.8, 2.10, 2.11, 2.11, 2.17, 3.2, 3.3, 4.2, 4.3 & 4.7 Courtesy of the Environment Agency;
Figures 1.4, 1.8a, b, 2.3, 2.12, 2.14, 2.15, 2.16, 3.1, 4.8 Copyright © Mike Dodd/The Open University;
Figure 1.7 Andy Harmer/Science Photo Library;
Figure 1.8c Courtesy of Dr John Madsen/Minnesota State University;
Figure 1.12 Copyright Dr Julian Thompson, Wetland Research Unit, Department of Geography, University College, London;
Figure 2.1 Copyright © Sukurta Viliaus & Co.;
Figures 2.2, 2.5a & 3.4 Copyright © Owen Mountford/Centre for Ecology and Hydrology;
Figure 2.5b Copyright © Peter Gathercole/Oxford Scientific Films;
Figure 2.6 Copyright © Alistair MacEwen/Oxford Scientific Films;
Figure 2.7 Copyright © BBC Worldwide;
Figure 2.18 With permission from Professor Chris Kjeldsen, Biology Department, Sonoma State University;
Figure 2.24 Graham Day;
Figure 4.4 Copyright © Peter Leeds-Harrison/Cranfield University;
Figure 4.5 Copyright © ARM Limited. Reproduced with permission of ARM Limited, Rydal House, Colton Road, Rugeley, Staffordshire, WS15 3HF, UK, armreedbeds.co.uk, designers of reed beds and welands for wastewater treatment;
Figure 4.6 Pisces Conservation Limited.
Courtesy of the Environment Agency;
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