Hypnea musciformis was collected during the summer and winter from a protected estuary and an exposed shore on the west coast of Florida. Apparent or net photosynthetic rates were recorded to determine optimal responses to light intensity, temperature, and salinity. The plants
showed broad tolerances to all three factors with high rates of net oxygen production occurring between 15-35‰ salinity. Analysis of variance indicated significant differences in tolerance to light intensity and salinity, but not temperature between plants from the two sites and seasons.
Responses of H. musciformis to forty-eight combinations of light intensity, temperature, and salinity were also conducted; the results suggest significant differences in synergistic effect between plants from the two sites. The photosynthetic rates of Hypnea can be used in predictive
modeling which is necessary in mariculture.
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