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JOURNAL OF PLANKTON RESEARCH | VOLUME 9 | NUMBER 1 | PAGES 79-90 | 1987
© Oxford University Press

research-article

An evaluation of isotope dilution effect from conventional data sets of 15N uptake experiments

J. Kanda, E.A. Laws1, T. Saino and A. Hattori

1Department of Oceanography, University of Hawaii at Manoa 1000 Pope Road, Honolulu, HI 96822, USA Ocean Research Institute, University of Tokyo 1-15-1 Minamidai, Nakano-ku, Tokyo 164, Japan

Received on December 1, 1985; accepted on September 1, 1986 A practical calculation procedure to correct the underestimate caused by isotope dilution in 15N uptake experiments is described. The estimate is based on the experimental observation of 15N incorporation into particuUtc organic matter but not on direct measurement of isotope enrichment in the substrate. Conventional data sets of 15N uptake and an estimate of the ratio of the flux of regeneration and uptake can provide the information needed to correct for isotope dilution. Application of this method to 15NH4+ uptake data in the literature showed that the underestimate is small in open ocean waters but sometimes substantial in coastal or estuarine waters.


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