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Science 1 February 1974:
Vol. 183. no. 4123, pp. 409 - 411
DOI: 10.1126/science.183.4123.409
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Articles

Suppression of Nitrogen Fixation by Blue-Green Algae in a Eutrophic Lake with Trace Additions of Copper

Alexander J. Horne 1 and Charles R. Goldman 2

1 Division of Sanitary Engineering, University of California, Berkeley 94720
2 Division of Environmental Studies, University of California, Davis 95616

Nitrogen fixation by blue-green algae in highly eutrophic Clear Lake, California, was severely inhibited by trace amounts of copper. The chelation capacity of the lake is probably saturated by indigenous copper. Additions were only 1/200 of those normally used in algal control. Since nitrogen fixation provides half of the lake's annual nitrogen budget, economical eutrophication control appears possible.

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Science. ISSN 0036-8075 (print), 1095-9203 (online)