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Appl. Environ. Microbiol., May 1996, 1803-1804, Vol 62, No. 5
Copyright © 1996, American Society for Microbiology

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

B Gu and V Alexander
Department of Fisheries and Aquatic Sciences, University of Florida, Gainesville, Florida 32653, and Institute of Marine Science, School of Fisheries and Ocean Sciences, University of Alaska Fairbanks, Fairbanks, Alaska 99775-1040

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.




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