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Marine and Freshwater Research Marine and Freshwater Research Society
Advances in the aquatic sciences
RESEARCH ARTICLE

Growth of Cylindrotheca closterium var. californica (Mereschk.) Reimann & Lewin on nitrate, ammonia, and urea

BR Grant, J Madgwick and Pont G Dal

Australian Journal of Marine and Freshwater Research 18(2) 129 - 136
Published: 1967

Abstract

Cylindrotheca closterium var. californica (formerly Nitzschia closterium Erhrenberg), a marine diatom, grew on nitrate, ammonia, or urea as a sole source of nitrogen. If the initial concentration of ammonia was 5 × 10-4M or above, there was a lag period before cell multiplication began. When the three forms of nitrogen were offered in combination, ammonia was used first, followed by urea, and finally nitrate. In the seawater medium used, cell multiplication was always accompanied by a rapid rise in pH of the medium, regardless of the nitrogen source.

https://doi.org/10.1071/MF9670129

© CSIRO 1967

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