Water

The amount of dissolved oxygen in a stream depends on photosynthesis. Photosynthesis adds oxygen to the water. Organisms such as fish, insects, spiders, and worms us oxygen to breathe. As the temperature increases in the stream or river, the dissolved oxygen deceases. Also the current of the stream affects oxygen in the water too. As the current speed decreases, there is less oxygen in the water. The decomposition of animals, fish and insects in the water also affects the oxygen level of water. During decomposition is used, therefore it decreases. Decomposition is used even faster in warmer waters than colder.

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