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Hypothesis: The population of Littorina saxatilis is greater in the middle zone. Aims of study: This experiment is being conducted in order to determine if the population of Littorina saxitilis is greater in the middle zone. My reason for this hypothesis is that the Littorina saxitilis’ main source of nutrition is the Fucus vesiculosus which is found in large quantities in the middle zone. Background on hypothesis: Littorina saxitilis is found on the upper eulittorial zone, down to the littoral fringe. They are typically found under bedrock, empty barnacle shells and under rocks. This is so they can reduce the drying effects of the wind. They can also be found on salt marshes and mud banks. They usually attach themselves to Fucus. Littorina saxitilis is a highly polymorphic species, they are found in southern Brittany and the British isles. L. saxatilis is able to withstand harsh conditions; they have a protective plate known as the operculum which tightly closes the opening of their shells. On dry land L. saxatilis ca