THE CAUSE OF A METALIMNETIC MINIMUM OF DISSOLVED OXYGEN1

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Abstract
Coincident with a condition of rapidly increasing eutrophication, Lake Washington, a large, deep lake, near Seattle, is exhibiting an increase in the magnitude of a metalimnetic depletion of dissolved oxygen. Possible causes of this depletion are examined, and the conclusion is that the respiration of a metalimnetic population of non‐migrating copepods is the prime agent. Calculations are presented in support of this conclusion, and chemical properties of the notch are compared with those of a hypolimnetic notch due to morphometric causes, to provide further evidence. The recent increase in magnitude of the phenomenon is considered to be due to the increase in numbers of copepods.

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