Net photosynthesis was measured for Gracilaria tikvahiae from the Great Bay Estuary, New Hampshire, U.S.A. using manometric and dissolved oxygen techniques. Comparisons were made between summer- and winter-acclimated plants. The net photosynthesis of G. tikvahiae was light-saturated at 200-600 m~ 2 s~' depending upon the season and incubation temperature. No light inhibition was observed up to the maximum experimental irradiance, 1440 m~ 2 s"1. Gracilaria tikvahiae had increasing photosynthetic rates between 5 ° and 25 °C. Maximum net photosynthesis occurred between 25 ° and 35 °C, while rates decreased at 37.5 °C. The net photosynthetic responses at 25 ° and 30 °C were stable after acclimation times of one to four days, but declined after three days at 35 °C. Gracilaria tikhaviae had an euryhaline net photosynthetic response between 5%o and 40%o. Several photosynthetic studies of other Gracilaria species have been conducted (e. g. Rosenberg and Ramus 1982, Beer and Levy 1983). Dawes et al. (1978) and Hoffman and Dawes (1980) found that Florida plants of G. verrucosa were tolerant of a broad range of irradiance, salinity, and temperature in accordance with the plants' estuarine distribution. Similarly, Adriatic G. verrucosa (as G. confervoides) showed broad photosynthetic tolerance to
Botanica Marina – de Gruyter
Published: Jan 1, 1985
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