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The effect of the size of the rock pools on the diversity of animals in the rock pool.

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Introduction

ROCKY SHORES The effect of the size of the rock pools on the diversity of animals in the rock pool Kashaf Iqbal 13 G Introduction I am going to investigate how the size of the rock pools effects the diversity of animals in the rock pools. Rock pools provide a glimpse into the underwater world. Once the "sea's blanket" is taken away, the rock pool is isolated as if it were a small aquarium and its living conditions begin to change. These environments are one of the harshest to be found on the coastline. There are various abiotic factors that affect the diversity of animals in a particular size of rock pools. Oxygen is one of the factors. Animals need oxygen for breathing. Oxygen is absorbed at the surface of the water. Therefore, animals in shallow rock pools would have more chance of getting oxygen than animals in deeper rock pools. This could have effect on the diversity of animals in deeper and shallow rock pools. Also, rock pools with more plants might have higher oxygen content in the day because plants are making oxygen during photosynthesis. 6CO2 + 6H2O --> C6H12O6 + 6O2 Temperature is another abiotic factor that affects the diversity of animals in a particular size of a rock pool. During the day, rock pools are heated by the sun and warm up, but during the night they are cooled. When water warms up, it does not pass the warmth downward easily. ...read more.

Middle

Fair Test To make it a fair test I will do the following: * I will count one species at a time. This would be the most suitable way of counting species as it is difficult to count more than one species at a time and there is more chance of error. * When I have counted one species of animals I will recount to make sure that I counted correctly the first time. * I am going to be doing the experiment on the middle shore only. This is because there is going to be a change in diversity of animals in the middle, upper and lower shore. The diversity will change because of the different environment at upper, middle and lower shores and some animals can not survive in these environments. * Any unidentified species will be put in the bucket so they can be identified later. This is important because animals of the same species might look a bit different sometimes (For example, might be different colours) and can not be counted as different species of animals. This would effect the calculations leading into errors. Implementation The experiment was carried out and the results are shown on the following page. From the data I have collected I am going to calculate the following three values: 1. Calculating the Volume of the Rock Pools The length, width and depth of the rock pools were measured in metres during the experiment because these are the values which are required to calculate the volume of the rock pools. ...read more.

Conclusion

There might have been some miscalculations in measuring the different number of species in the rock pool which would have effect on the diversity index of animals in the rock pools. More rock pools could have been observed because increasing the sample size increases the chance of getting accurate results. I had limited time to carry out the experiment because the experiment had to be done on the same day. Therefore, only 15 rock pools could be observed. However, if I had assistance from someone else, more rock pools could have been observed and this would give me an even wider range of rock pools to compare. Another way to get more accurate results is that I could have taken a different approach to select the rock pools. I could set different ranges which the sizes of the rock pools had to be in between. For example, I could set 5 different ranges: 0.00 - 0.30 cm3, 0.40 - 0.60 cm3, 0.70 - 0.90 cm3, 1.00 - 1.20 cm3, 1.30 - 1.50 cm3. Then I could select 3 rock pools for each of these ranges that I have set, i.e., 3 rock pools with sizes between 0.00 and 0.30 cm3 and 3 rock pools for each of the other ranges. This would give more accurate results as I have observed rock pools which vary in sizes more. In the experiment that I carried out I selected any rock pools on the middle shore. This way, I observed rock pools which didn't vary much in sizes and this change in size might not be enough to have any change in diversity of the animals in the rock pools. ...read more.

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