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After about 20 hr at low light intensity in the laboratory, photosynthesis was depressed in Myriophyllum spicatum tips at a salinity of 32%., but respiration was not affected. Neither photosynthesis nor respiration was depressed at salinities of 16%. and less. When the plants were maintained on 10-14-hr light-dark cycles at moderate light intesities, after 48 hr and up to 10 days, photosynthesis was depressed at salinities of 16%. below that of plants in Albemarle Sound water, although respiration remained high. The depression of photosynthesis at high salinity and its effect on the P:R ratio are assumed to play a part in controlling natural distribution of M. spicatum in estuaries.
Limnology and Oceanography