Abstract
The phanerogamic and algal vegetation of these marshes, forming part of a growing area, were mapped in 1932/33, and again in 1957. The maps accurately reflect observed changes in the vegetation which in places has been substantial. The most important change has been the advent of Spartina townsendii. It is evident that the arrival of this species will affect the future succession on these marshes. A comparison of the maps and the changes that they reflect can be used to indicate the rate of change from 1 type of vegetation community to the next. A companion of these rates with those obtained from accretion rates suggests that possibly the former rate of subsidence in East Anglia may be decreasing.

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