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THE CAUSE OF A METALIMNETIC MINIMUM OF DISSOLVED OXYGEN 1
Author(s) -
Shapiro Joseph
Publication year - 1960
Publication title -
limnology and oceanography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.7
H-Index - 197
eISSN - 1939-5590
pISSN - 0024-3590
DOI - 10.4319/lo.1960.5.2.0216
Subject(s) - hypolimnion , eutrophication , magnitude (astronomy) , population , environmental science , respiration , oceanography , hydrology (agriculture) , ecology , geology , biology , nutrient , physics , demography , botany , geotechnical engineering , astronomy , sociology
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.