Photosynthesis of Gracilaria tikvahiae McLachlan (Gigartinales, Rhodophyta) from the Great Bay Estuary, New Hampshire)

Photosynthesis of Gracilaria tikvahiae McLachlan (Gigartinales, Rhodophyta) from the Great Bay... 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 http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Botanica Marina de Gruyter

Photosynthesis of Gracilaria tikvahiae McLachlan (Gigartinales, Rhodophyta) from the Great Bay Estuary, New Hampshire)

Botanica Marina, Volume 28 (10) – Jan 1, 1985

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Publisher
de Gruyter
Copyright
Copyright © 2009 Walter de Gruyter
ISSN
0006-8055
eISSN
1437-4323
DOI
10.1515/botm.1985.28.10.427
Publisher site
See Article on Publisher Site

Abstract

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

Journal

Botanica Marinade Gruyter

Published: Jan 1, 1985

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