• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

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

Extracts from this document...

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.

The above preview is unformatted text

This student written piece of work is one of many that can be found in our AS and A Level Energy, Respiration & the Environment section.

Found what you're looking for?

  • Start learning 29% faster today
  • 150,000+ documents available
  • Just £6.99 a month

Not the one? Search for your essay title...
  • Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

See related essaysSee related essays

Related AS and A Level Energy, Respiration & the Environment essays

  1. Marked by a teacher

    Effect of nitrate concentration on the growth of Duckweeds

    5 star(s)

    In order to increase the reliability of the results factors such as the PH were kept constant. As the PH used was not too acidic or too alkaline, so that PH does not become a limiting factor for growth. The solutions used were dilute, so were a suitable environment for the duckweeds to grow.

  2. Marked by a teacher

    Investigation on the size of Limpets.

    5 star(s)

    0.6889 0.60 0.36 29 0.65 0.4225 0.57 0.3249 30 0.25 0.0625 0.69 0.4761 Total 9.82 4.0362 18.29 11.3573 Mean x Mean x = x = x = 9.82 = 18.29 30 30 = 0.328 = 0.61 Variance (s�) = ?x� - (?x)

  1. Marked by a teacher

    A comparative study of the density of patella vulgata (common limpet) across a sheltered ...

    4 star(s)

    Wave action: - Patella vulgata is found on rocky shores from the most sheltered parts of the shore to the most exposed. Under conditions of very high exposure the common limpet can be limited to the upper region of the shore.

  2. the effect of bile concentration on the activity of the enzyme lipase during the ...

    This is because the bile salts emulsify large fat molecules into smaller droplets providing a larger surface area for the enzyme lipase to work on as it is water soluble and not lipid soluble so it can only act on the surface of the fat molecules.

  1. An investigation into the distribution of adult and juvenile limpets on a rocky shoreline.

    Calliper is used to measure the base diameter of limpets. It has a higher degree of accuracy compared to a ruler. It can measure lengths to the nearest tenth of a millimetre, thus more reliable. 30m tape measure to be laid out as a transect path to take sample along it.

  2. Zonation on the Rocky Shore at Starfish Bay.

    Transfer your data collection in ink and ensure that it is clear. 10. Collect a copy of each groups' data before you analyse your data. Additional Notes 1. It is extremely easy to be dehydrated, so bring a full bottle of water. Wear a hat or sunglasses if necessary.

  1. Investigate the effect of bile salt concentration on the digestion of milk by the ...

    Make sure that the bile salt solution is measured precisely by ensuring that at eye level the meniscus of the bile salt solution touches the calibration mark on the pipette. 6. Stir the solution thoroughly using a stirring rod 3 times clockwise to ensure precision in the agitation.

  2. A Comparative Study of the Density of Patella Vulgata (Common Limpets) in the Optimum ...

    The shell is waterproof which is extremely helpful with conserving water. The amount of wave action affects the shell shape. In sheltered areas, they tend to be more flattened, and in exposed areas which have more wave action, they tend to be dome shaped.

  • Over 160,000 pieces
    of student written work
  • Annotated by
    experienced teachers
  • Ideas and feedback to
    improve your own work