A Sandy Area in the Dovey Estuary

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Abstract
A young dune is developing on a tidal area at the seaward end of the Dovey estuary, and the present vegetation shows an interesting compromise between the original salt-marsh flora and the superimposed advance dune flora. The specific constitution of the former is similar to that higher up the estuary, with certain modifications, notably that owing probably to poor drainage of certain parts, Armeria maritima is here subordinate to Glaux maritima at the same tidal level as the Armerietum of the main Dovey marshes. The higher salt-marsh communities are largely replaced by the encroaching dune flora; the dominant dune pioneer is Triticum junceum, which shows a considerable vertical range, probably due to its utilization of the comparatively fresh ground water. Tidal action on the area is limited to the spring tides, and it is exceptional for the young dune to be completely covered. Tidal submersion has little effect on the level of the ground water above high water mark. The ground water is kept at a low salinity value by drainage from surrounding dunes, and the greater proximity of the comparatively fresh water table to the surface is thought to be responsible for the difference in winter salinity conditions between the lower parts of the area and the young dune itself.

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