Within lakes, eutrophication is a direct result of algae or cyanobacteria at the water's surface depleting oxygen; during this process, oxygen levels at the bottom of lakes remain relatively constant.

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During eutrophication, excess nutrients in the water cause increased growth of algae and cyanobacteria. As these organisms die and decompose, they sink to the bottom of the lake and are broken down by bacteria, which consume oxygen in the process. This can lead to oxygen depletion at the bottom of the lake, creating "dead zones" where fish and other organisms cannot survive.

Within Lakes, Eutrophication Is a Direct Result of Algae or Cyanobacteria