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To study and compare the density of cthamalus montagui (shield shaped barnacles) on an exposed and sheltered shore.

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Introduction

Sarah Tayler A2 BIOLOGY COURSEWORK ON ECOLOGY. Aim: To study and compare the density of cthamalus montagui (shield shaped barnacles) on an exposed and sheltered shore. Introduction and information of specimen studied: The 'cthamalus montagui', more commonly known as the 'Shield Barnacles' are crustaceans that have jointed legs and shells of connected overlapping plates. Their size varies from 0.1cm to 1cm wide. Instead of crawling after food, they glue themselves to rocks on shores and wait for food to wash by during high tide. When they are under water or when a wave washes over them, they reach out little feathery barbed legs to strain out plankton and absorb oxygen. The barnacle's predators are worms, snails, sea stars, fish, and certain Barnacles on a rocky shore. Plan: = Firstly, the experiment will be divided into two areas : The exposed shore and the sheltered shore. * I will the count the number of Cthamalus montagui on an exposed shore by placing 4 quadrats (0.25m2 each) on a straight parallel line from the shoreline. The area covered will be at a chosen vertical distance of 1.5m from the shore line at low tide (0.88m). * This distance will be chosen so that a good presence of barnacles can be found.This distance is also maintained for both shores so that a comparison can be drawn at the end of the experiment. ...read more.

Middle

> Another reason would be the absence of the barnacle's predators such as worms and whelks(which are known to be able to wipe out entire colonies of barnacles) which prefer less rough habitats. The lack of these organisms on exposed shores allows the barnacles to live, breed and eat more comfortably on exposed shores. > On an exposed shore a higher concentration of minerals and food (plankton) as the flow of water (which carry the food and minerals) on an exposed shore is stronger and more direct. Therefore it can reach higher distances up the shore giving a larger area for the barnacles to colonise. > Less organisms and a more water gives the barnacles ample supply of oxygen, which is needs thus allowing easier gas exchange to take place. > A more direct flow of water which allows the water to move further up the shore allows barnacles further up the shore to keep moist (an essential survival action) more easily. > All these elements allow a bigger population of barnacles to live in exposed shores. A more dense area of barnacles also allows it to breed more easily. As a barnacles can only breed when its eggs are fertilized by its neighbour, a bigger population increases the chances of reproduction. ...read more.

Conclusion

96 22 55 302 9 78 81 154 278 10 63 93 187 294 11 104 186 199 101 12 86 178 201 78 13 194 196 305 89 14 59 141 207 41 15 69 78 87 124 16 105 64 71 117 17 125 78 63 181 18 197 141 62 194 19 107 180 45 78 20 78 147 61 92 21 297 98 89 71 22 305 76 87 121 23 280 86 66 74 24 57 154 59 81 25 63 190 40 95 SHELTERED SHORE Vertical Distance = 1.5m Horizontal Distance = 66ft Quadrat 1 2 3 4 Section = 1 24 0 0 0 2 15 5 1 0 3 2 2 0 2 4 8 3 0 0 5 5 4 5 0 6 7 6 4 0 7 6 8 0 4 8 10 5 0 6 9 4 4 0 7 10 0 0 4 8 11 5 1 5 4 12 12 3 6 0 13 2 0 4 0 14 5 2 0 18 15 0 0 3 12 16 0 0 2 0 17 7 2 0 10 18 8 0 1 0 19 5 4 0 0 20 6 0 10 0 21 2 15 0 13 22 0 0 4 0 23 5 0 40 5 24 2 0 81 4 25 1 0 32 0 ...read more.

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