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Primary Production: Freshwater Ecosystems

Gene E. Likens
Human Ecology
Vol. 1, No. 4, The Primary Production of the Biosphere: A Symposium Given at the Second Congress of the American Institute of Biological Sciences (Sep., 1973), pp. 347-356
Published by: Springer
Stable URL: http://www.jstor.org/stable/4602274
Page Count: 10
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Primary Production: Freshwater Ecosystems
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Abstract

Freshwater bodies include a small fraction of the earth's surface (0.5%) and the biosphere's production. Freshwater productivity is difficult to estimate because of both problems of measurement and the great diversity of water bodies. A total production of 1.3 × 109 tons/year is suggested. Freshwater bodies are now subject to widespread unnatural fertilization or cultural eutrophication. While this process increases their productivity, in many cases it shifts that productivity into forms less suitable for use as human food.

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