Abstract

Diurnal changes of the dissolved carbohydrates in relation to fluctuations in plankton content and primary productivity were investigated in two freshwater ponds. The highest amount of DCHO recorded was 52·25 mg/litre which appears to be high as compared to those of temperate waters. The amount of carbon released in DCHO usually exceeded that of the carbon assimilated during photosynthesis. It has been suggested that probably factors such as temperature, pollution and bacterial activity are responsible for the high yield of dissolved carbohydrates.

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