Accepted: 16 June 1980.
OPTIMUM N:P RATIOS AND COEXISTENCE OF PLANKTONIC ALGAE1
Article first published online: 28 JUN 2008
Journal of Phycology
Volume 16, Issue 4, pages 486–489, December 1980
How to Cite
Rhee, G.-Y. and Gotham, I. J. (1980), OPTIMUM N:P RATIOS AND COEXISTENCE OF PLANKTONIC ALGAE. Journal of Phycology, 16: 486–489. doi: 10.1111/j.1529-8817.1980.tb03065.x
This work was supported by National Science Foundation grant DEB 75-19519 and Environmental Protection Agency grant R804689. We thank Miss S. Allen for the identification of species isolated in our laboratory, Dr. G. W. Fuhs for comments on the manuscript, Dr. V. J. Bierman, Jr. for helpful discussions and Mrs. E. Kusel for technical assistance.
- Issue published online: 28 JUN 2008
- Article first published online: 28 JUN 2008
- N:P atomic ratios;
- diel rhythm
The optimum atomic ratio of N to P, the ratio at which one nutrient limitation changes over to the other, was determined in seven species of freshwater planktonic algae. The ratio varied over a wide range among species; the average for these species was 17. If the cellular nutrient ratios in marine species are comparable with those in freshwater organisms, Redfield's ratio of 15 is remarkably close to the average. Cellular N:P ratios varied over a 24-h period under a light:dark cycle. The variation of the optimum ratio between species and diel change in cellular N:P ratios within a species could play an important role in population dynamics by enhancing the probability of coexistence of species.