Comparison of radioactive and stable isotope tracer techniques for measuring photosynthesis: 13C and 14C uptake by marine phytoplankton |
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Authors: | Slawyk Gerd; Minas Monique; Collos Yves; Legendre Louis; Roy Suzanne |
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Institution: | Station Marine d'Endoume, Laboratoire d'Ocanographie, Campus de Luminy Case 902, 13288 Marseille Cedex 9, France
1GIROQ, Dpartement de Biologie, Universit Laval Qubec, Qubec G1K 7P4, Canada |
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Abstract: | The stable carbon isotope 13C has been used in the open oceanto estimate the inorganic carbon uptake by phytoplankton andthis technique has been compared with the 13C tracer method.An overall correlation coefficient of 0.806 and a regressionslope of 1.29 were calculated from 50 sample pairs gatheredduring three cruises in widely different oceanic areas rangingin production rates from 0.01 to 6 mgC m3 h1.However, significant differences between the two methods wereapparent for cruises located in nutrient-depleted areas. Possibleexplanations lie either in a volume effect, the high silicatecontent of the 14C solution which could stimulate the 14C uptakeor in errors associated with the particulate carbon measurementswhich are necessary to convert specific uptake rates to absoluteuptake rates and to yield compatible units for the comparison,in laboratory cultures the 14C technique overestimated the netparticulate carbon increase by 16%.
+Present address: Laboratoire marin CNRS-IFREMER, L'Houmeau,17137 Nieul-sur-Mer, France.
*This paper is the result of a study made at the Group for AquaticPrimary Productivity (GAP) First International Workshop heldat the Limnological Institute, University of Konstanz, in April1982. |
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