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How does temperature affect the rate of photosynthesis by aquatic plants?

As water temperature increases, plants tend to produce more oxygen, to grow faster, and to die at a faster rate.

During the day, plants are producing oxygen and dissolved oxygen levels in the water tend to increase throughout the daylight hours. In the dark, photosynthesis stops, but the consumption of oxygen by organisms continues.  Therefore, at night and in early morning hours, the amount of dissolved oxygen in the water tends to decrease.

Bacteria in the water feed on dead plants.  These bacteria use up some of the dissolved oxygen in the water.  Therefore, as more plants die, the amount of dissolved oxygen in water decreases.

Algae covers the water (Lake Madison, TX)

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