Fractionation of stable carbon isotopes by marine phytoplankton

Details Fractionation of stable carbon isotopes by marine phytoplankton Fractionation of stable carbon isotopes by marine phytoplankton

Dec 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978gecoa..42.1809w&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 42, Issue 12, pp.1809-1815

Computer Science

15

Scientific paper

Stable carbon isotope fractionation by seventeen species of marine phytoplankton, representing the classes of Bacillariophyceae, Chlorophyceae, Prasinophyceae, Chrysophyceae, Haptophyceae and Dinophyceae have been determined in laboratory culture experiments using bicarbonate enriched artificial sea water. The HCO 3 - values ( HCO 3 - = 13 C of algae vs HCO 3 - ) range from -22.1 to -35.5%. Nitzschia closterium shows the smallest fractionation of - 22.1% and Isochrysis galbana , the greatest of -35.5%,. Since these algae were cultured under identical laboratory conditions, the wide range of HCO 3 - values is seemingly due to the presence of different metabolic pathways within these organisms. A temperature dependent fractionation of 0.36% per °C with decreasing temperatures was measured for Skeletonema costatum whereas, smaller temperature dependencies of -0.13, +0.15 and -0.07%. per °C were observed for Dunaliella sp., Monochrysis lutheri and Glenodinium foliaceum , respectively. The consistency of HCO 3 - values of Skeletonema costatum, Dunaliella sp. and Monochrysis lutheri grown at salinities of 22, 26, 32 and 36% indicates that natural salinity variations have negligible effects on the isotopic composition of marine phytoplankton.

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