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Seaweed Study on a Rocky Shore

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Seaweed Study on a Rocky Shore Introduction Two-thirds of ocean activity occurs on or around the coastline. On every beach there is seaweed. I am going to investigate the dominant species of seaweed on West Runton beach, North Norfolk near Cromer. I will also investigate the diversity of each seaweed on the beach. I will take into account some abiotic influences as well e.g. P.H, salinity, sand and stone size Aim: To find out the predominant species in three squares set out at different distances from the sea. To find out the diversity of seaweed on the beach. Also measure the temperature, P.H, salinity and investigate the sand and stone sizes to see if they affect the seaweed distribution. Hypothesis: The distribution of the most dominant seaweed species is directly affected by the position on the beach (towards or away from the sea). This hypothesis is based on the idea that the seaweed that is most common in one area of the beach will not be the most common in other areas up the shore. Apparatus: The apparatus I have chosen is the most appropriate piece of equipment for the task, relating to scale and detail, as was available to me. �1x1m Quadrate, �ID sheet, �Random number sheet, �Electrical thermometer, �PH testing kit, tape measure �A note pad and pencil. �A calculator Diagram: Methodology: Simple Preliminary Test: The preliminary test was done to find the most commonly found seaweed in an area of shoreline. ...read more.


4 Station 5 Station 6 Bladder Wrack 92 31 84 53 69 73 Serated Wrack 6 14 7 16 0 22 These are the results of the third square that we did: Station 1 Station 2 Station 3 Station 4 Station 5 Station 6 Bladder Wrack 0 0 0 0 29 100 Serated Wrack 0 3 0 0 27 0 Entermorpha 35 80 37 74 53 0 Sea Lettuce 0 0 0 29 0 0 Laver 0 0 0 3 0 0 The results of both the preliminary and the actual experiment are also in the form of graphs. Average Temperature: (in degrees Celsius) Square 1: Sand =14.8 Water =15.3 Air: 13.7 Square 2: Sand =15.0 Water =15.1 Air: 13.6 Square 3: Sand =15.3 Water =14.8 Air: 13.6 PH of Water: Square: 1: 8 Square: 2: 9 Square: 3: 8 Analysing the Results: The graphs show that Enteromorpha and Bladder Wrack are situated in their own specific niche. This is shown in the graphs by the direct correlation between species. This tells us that Enteromorpha and the Bladder Wrack are the dominant species on the beach. This is because they are best suited to the rock on the beach. Enteromorpha is the dominantly found on soft rocks e.g. chalk, whereas the Bladder Wrack is best suited to the hard rock e.g. flint. Sea lettuce, Laver and Serrated Wrack were found randomly placed within larger areas of dominant seaweed. ...read more.


The results show that the distribution of the most dominant seaweed is affected by its position on the beach. However in the hypothesis we thought that it would be a direct effect, this we discovered was not true. It was the effects that the position on the beach had on other factors that influenced the distribution of the seaweeds. Evaluation: I believe that our experiment was carried out as well as we could, considering that we had little time to plan the experiment and we did not know the lay out of the beach. The apparatus was the best we could use so we had to make the best of what we had. Some of the apparatus also was not available all the time, like the thermometer, which was out of use because of other people wanting to use it. The results we had we the best we could get due to the nature of out experiment. The quadrate was easy to use but it did not give truly accurate readings, because some squares were not fully covered. Also in some of the squares there were rocks pools, which could lead our experiment astray. In the experiment we found two anomalies, Laver and Sea lettuce. I think that if we had created a larger survey we may have been able to find out were these varieties mainly occurred. If I were to do the experiment again I would spend more time on the experiment and repeat it three of four times. This will give me a better chance of proving my hypothesis. Daniel Francis 11RW 10/09/01 ...read more.

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