Photosynthetic release of oxygen by Thalassia hemprichii shoots incubated at various levels of dissolved oxygen at Minicoy lagoon was reported. Dissolved Oz levels enriched to almost saturation caused very low rate of net photosyllthesis (63%) over the normal dissolved 0 2 levels. Whereas low levels of dissolved oxygen in the ambient water enhanced the net photosynthesis to 205%. The results are discussed with reference to the Warburg effect and the similar situation that occur in lagoon systems.

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