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The Effect of the Oxygen Concentration in the River on Gammarus Pulex Rationale: Whilst doing a group study on the biodiversity of life in different parts of the river, I noticed a difference in the number of Gammerus Pulex. I thought this might be due to the difference in abiotic factors such as pH and flow rate. After doing some research on this species I discovered that they are particularly fond of more oxygenated water, thus I constructed my hypothesis to investigate this. Gammarus Pulex: This species is more commonly known as the fresh water shrimp. It is generally found in shallow fresh water rivers, although they have been known to tolerate lakes with a stream running into it for example. This is probably due to the higher oxygen levels in the water. They spend most of their time under stones in the bed of the river and feed on decomposing plant...

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