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Introduction Sand dunes provide a classic example of the progression of ecological succession, with species becoming more varied and numerous as time passes. As one species makes the conditions less harsh, another is able to grow and thrive, eventually out-competing the first species. Sand dunes begin to form when sand is blown inshore from a beach. The sand is trapped by obstacles such as pebbles, seaweed or semi-halophytic plant species such as sea rocket and prickly saltwort on the strand line. These pioneer species have physiological adaptations such as thick waxy leaves and a small surface area which allow them to tolerate salty conditions to some extent, but are not able to tolerate immersion in salt water for long periods of time. The mound of sand begins to grow, as sand deposited on the inshore side of the dune is shielded from the wind by the mound itself. As the mound of sand...

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