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Investigate and compare, the biodiversity of freshwater invertebrates, of two water bodies, with high and low dissolved oxygen levels. Abstract The aim of the study was to compare the biodiversity of two water bodies dependent on the fixed variable of dissolved oxygen levels. The hypothesis was that there would be a greater biodiversity at the water body with a high dissolved oxygen level. The biodiversity was measured by 10 samplings of the water body with a net, and the organisms found were identified, counted and then returned. The samples were taken from River Stour a large lotic (flowing) river with high dissolved oxygen levels, and Dead River a lentic (still) water body with very low dissolved oxygen levels. The results showed there was a significantly greater biodiversity at River Stour with the high dissolved oxygen levels, this is because adequate dissolved oxygen is needed and necessary for good water quality. Oxygen is...

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