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I will be comparing two ponds with different amount and variety of species in them. During this field trip the independent variable will be the different ponds (i.e. Peter's pond and Bay Pond) and the dependent variable

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Introduction

Bay Pond Field Trip Investigation Planning: Aim: To compare the diversity and amount of organisms in two different ponds (Peter's Pond and Bay Pond). Variables: I will be comparing two ponds with different amount and variety of species in them. During this field trip the independent variable will be the different ponds (i.e. Peter's pond and Bay Pond) and the dependent variable will be the number of species and organisms in the two ponds. In addition, I will be looking at the pH, temperature, depth and the turbidity of the pond (the abiotic factors) to see whether these aspects have an effect on the presence of the organisms as I predict that there will be a relationship occurring. To make it a fair test, I will be performing the sweeps consistently, making sure that the technique that I use is constant so that it will be fair, I will also control the time, date and place (i.e. near reeds, in open water etc.) in which the procedure is taking place. Prediction: I predict that the pond with the lower turbidity will contain a wider diversity and broader amount of organisms than the pond with the higher level of turbidity. This is because as one pond has a higher level of turbidity, the murkier and dirtier the water is and this increases when there is a lot of solids in the water and in this case it is due to a large number of carp in the pond. When there are a lot of particles, then there is less light reaching the plants that need the light for photosynthesis, which means that there will be fewer herbivores as they can't make their own food. ...read more.

Middle

Also I found that it was less turbid in Peter's pond than it was in Bay Pond and theoretically they should be more herbivores in Peter's Pond than in Bay pond and my results prove this. This refers back to my prediction and proves that it was correct as I also mentioned in my prediction that the pond with the higher pH will have more herbivores due to vegetation removing carbon dioxide from the water and this makes the pH rise because carbon dioxide is acidic and so removing it will make the pond more alkaline but my results show that this is not the case for these ponds as in Peter's pond, it contains more herbivores but has a pH less than Bay Pond. Also I said that the higher the temperature, the less organisms that will be found because it slows down the rate of photosynthesis, and so less herbivores will be able to make their own food, and my results show this as Bay pond has less herbivores than in Peter's Pond. There are less detritivores in Bay pond than in Peter's pond but I do not think that this should have been the case as in theory; there should be more detritivores in Bay pond than in Peter's pond because of all the carp in Bay pond which are detritivores as they feed off all the dead matter at the bottom of the pond. And I see no other reason why it should be the other way round (i.e. more detritivores in Peter's pond than in Bay Pond) so therefore there must have been a systematic error during the procedure. ...read more.

Conclusion

I think that because of the measurements that we took were not reliable, I'm certain next time if I repeated the whole investigation again the way that I had planned it, and we would not get the same results that we have. Also I would definitely measure the abiotic factors at least twice to make sure that they are reliable as well. So based solely on my results and measurements, I would say that my conclusion is inaccurate and needs to be re-looked at a second time with a more suitable procedure. Further work that I could do to provide additional evidence for my conclusion would be to change some of the abiotic factors, for example the pH of the pond. I would like to see whether my prediction is correct by testing out a variety of pHs to see what would be the minimum pH and the maximum pH in which organisms would be able to survive in. This could apply to the temperature of the pond. Also as we were only situated in one part of the pond to perform the investigation, I would like to expand this range to see whether different results come up in different areas depending on the environment around - whether this has an effect on the organisms in the ponds. I think looking at all these factors, will help me to be more confident in the validity of my conclusion and make it more secure. And perhaps I would be able to see clearly any trends and patterns and be able to analyse them better. ?? ?? ?? ?? By Stephanie Liu (9W) ...read more.

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