Species diversity on the Ynyslas sand dunes.

... Species diversity on the Ynyslas sand dunes For this work we went to the Rheidol study centre near Aberystwyth in Wales. From here the field work was carried out on the Ynyslas sand dunes near the River Dovey mouth on the west coast of Wales (see map). Sand dune formation To form the following things are needed: supply of sand wind stabiliser Stage 1 - Sand particles are transported by the prevailing wind by the process of saltation. If there is a stabiliser, an obstacle, sand is deposited on the leeward side where it can no longer be picked up be the wind. The grains build up and form a small dune. Stage 2 - Dune continues to grow and in colonised by pioneer species such as marram grass. The roots bind the sand and the shoots trap more sand and an embryo dune is formed. Stage 3 - The dune increases in size and is

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