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An endogenous rhythm in edaphic salt marsh community photosynthesis was demonstrated but no evidence for a similar respiratory rhythm was found. Photosynthesis exhibited both temperature— and light—modulated rhythms. Light saturation of the system did not occur at less than 50% of full sunlight. Respiration also exhibited light— and temperature—induced rhythms.
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Gallagher et al. (1973) studied this question.
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