Acknowledgements
We would like to thank Natural England staff, in particular Ken Obbard (Area Team Lead Advisor) for collecting the water samples and Stephen Etherington (Reserve Manager Stodmarsh NNR) for facilitating access; Dan Bennett of Ecology Co-op for carrying out the invertebrate survey; and Nick Button (Natural England Field Unit), Dr Martin Willing (conchologist), Martin Winter and Harry Ferguson (Environment Agency) for confirming or identifying some of the invertebrate samples.