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The carbon isotope composition of photosynthetic organisms reflects the (delta)(sup13)C of their inorganic carbon sources. The large difference between (delta)(sup13)C in cyanobacterial surface scums (-25 to -18(permil)) and subsurface blooms (-34 to -30(permil)) in a subarctic lake indicates direct atmospheric CO(inf2) fixation by the scums.

Stable Carbon Isotope Evidence for Atmospheric CO(inf2) Uptake by Cyanobacterial Surface Scums in a Eutrophic Lake