Abstract
PLANKTON samples taken during the cruise of R/V Atlantis II in the Black Sea during March and April 1969 were analysed for their 13C/12C ratios. The results showed that over a large area of the Black Sea the plankton had uniform δ13C values near −23 parts per 1,000. A sample from a very pronounced diatom bloom, however, was enriched in 13C by 1.5 parts per 1,000. This isotopic shift was apparently produced by the organisms' accelerated carbon fixation which had decreased the available supply of inorganic carbon.
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DEUSER, W. Isotopic Evidence for Diminishing Supply of Available Carbon during Diatom Bloom in the Black Sea. Nature 225, 1069–1071 (1970). https://doi.org/10.1038/2251069a0
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DOI: https://doi.org/10.1038/2251069a0
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