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Distribution of dissolved carbohydrate (DCHO) in 21 bodies of water on Cape Cod has been analyzed with reference to type of body of water, primary productivity, depth, and pH, Eh, or organic content of the substrata. Water from 10 stations was analyzed in the fall of 1963 and late winter of 1964. In the fall, the highest concentrations of DCHO (1.16-3.17 mg/liter) were found in highly productive estuaries. Other waters had DCHO concentrations ranging from 0.40-1.00 mg/liter. In deeper waters, concentrations were higher at surface than at bottom, suggesting the distribution is related to phytoplankton productivity. No relationship was found between DCHO, concentrations and pH, Eh, or organic content of the substratum. At nine stations, concentrations during a late winter phytoplankton bloom decreased by 11.1 to 100% from those of the fall. The data suggest that phytoplankton play a major role in regulation of DCHO concentration in natural waters.
Limnology and Oceanography