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Free Content Photosynthetic Rates and Primary Production by Two Florida Benthic Red Algal Species from a Salt Marsh and a Mangrove Community

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Hourly photosynthetic rates were determined in situ for Bostrychia binderi and Gracilaria verrucosa at a salt marsh (WWR) and a mangrove swamp (CRB) on the west coast of Florida over a 24-h period using the Winkler L/D bottle technique. Each population had a peak in photosynthesis in mid-morning, dropping to low levels by the afternoon. A conversion between L/D bottles and manometric determinations under identical conditions in the laboratory was determined, 0.0115 mg-at O2/μl O2. Diel fluctuations in photosynthesis were found when plants were run 24 h under constant conditions in the laboratory. Labelled carbon (C14) was used to obtain photosynthetic quotients for Bostrychia (WWR: 1.4; CRB: 1.2) and Gracilaria (WWR: 1.3; CRB: 1.2). Net production (g C/m2/day) was determined for Bostrychia (WWR: 0,179; CRB: 0.141) and Gracilaria (WWR: 0.216; CRB: 0.160) and was found to be lower than that reported for other macroalgae, probably due to the lack of diel data on photosynthetic activity in previous studies.

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Document Type: Research Article

Publication date: 1980-04-01

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  • The Bulletin of Marine Science is dedicated to the dissemination of high quality research from the world's oceans. All aspects of marine science are treated by the Bulletin of Marine Science, including papers in marine biology, biological oceanography, fisheries, marine affairs, applied marine physics, marine geology and geophysics, marine and atmospheric chemistry, and meteorology and physical oceanography.
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