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Science 11 June 1982:
Vol. 216. no. 4551, pp. 1219 - 1221
DOI: 10.1126/science.216.4551.1219
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Articles

Micronutrients and Kelp Cultures: Evidence for Cobalt and Manganese Deficiency in Southern California Deep Seawater

JAMES S. KUWABARA 1

1 W. M. Keck Engineering Laboratories, California Institute of Technology, Pasadena 91125

It has been suggested that naturally occurring copper and zinc concentrations in deep seawater are toxic to marine organisms when the free ion forms are overabundant. The effects of micronutrients on the growth of gametophytes of the ecologically and commercially significant giant kelp (Macrocystis pyrifera) were studied in defined media. The results indicate that toxic copper and zinc ion concentrations as well as cobalt and manganese deficiencies may be among the factors controlling the growth of marine organisms in nature.

Submitted on October 13, 1981
Revised on December 15, 1981

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