If algae produce oxygen in a pond, how can having too much algae cause an oxygen depletion?

Good article that explains how phytoplankton can affect oxygen depletion in our water. Click here or on the pdf file to read the full article or an excerpt below.

 

Algae blooms also respond to changes in the weather, and the denser the bloom, the more severe the response can be. Photosynthesis slows down under cloudy conditions, and, as a result, oxygen production decreases. Extremely calm days may also reduce photosynthesis and oxygen production, even under sunny conditions, by preventing phytoplankton in the middle layers of the pond from mixing near the brighter surface. In summer, oxygen problems may arise because of a simple physical property of water. The warmer the water, the less dissolved oxygen it can hold. When a dense bloom produces a surplus of oxygen on a summer afternoon, the oxygen will not stay in solution and escapes into the atmosphere. During the night, the bloom attempts to take more oxygen out of the water than what remains from daytime photosynthesis. When this occurs, dissolved oxygen levels approach zero.

 

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