This report followed on from a baseline survey in 1991 and a monitoring survey in 1992 (Kirby 1992, 1993) to investigate the possible impact on invertebrate populations of changes in water quantity or quality resulting from compensation from an augmentation scheme. The aims of the 1993 survey were: to sample the water beetles and molluscs at ten ditches monitored in 1992; compare the results with the previous two years’ monitoring, highlighting any detrimental changes that may be ascribed an inadequate water supply to the fen.
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