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Siren 's Rock Between Island Bay And Owhiro Bay

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On Wednesday the 18th February the year 12 biology class went to Siren 's Rock between Island bay and Owhiro bay to study community patterns. The community pattern we were studying was zonation on the rocky shore. Zonation is when an environmental factor changes, the distribution of species changes which results in the species being present in zones or bands. In this report I am going to talk about the Cellana denticulata limpet, the Cellana radian and the relationship between the two species. Species 1: Description: The Cellana denticulata is a limpet which belongs in the true limpet family. A true limpet is a small marine gastropod mollusc. The C denticulata is a mollusc due to it having a soft body with a hard shell. The shell of the C denticulata is a lot more elevated and bigger than other species of limpets with 20-30 strong ribs granulose and scaly. The colour of the shell can vary from a grey to brown colour. On the inside of the shell the C denticulata is a bluish whitey colour with darker streaks where the undersides of the ribs are. The C denticulata has a strong muscular foot on the underside of their body which allows it to suction itself onto the rock to prevent slipping or falling from the rock. This limits the movements of where the C denticulata can travel as they cannot move in large distances. This means when it comes to feeding the C denticulata doesn 't travel very far. They are algae grazers, which graze when the tide is in by scraping the algae off

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