Abstract
Photosynthesis and respiration in Ahnfeltia plicata (Huds.) Fries (Gigartinales) was measured in a seawater flowthrough system at different temperatures, salinities and photon flux densities (PFD). The exchanges of dissolved oxygen and inorganic carbon were continuously recorded with an oxygen probe and a pH electrode measuring variation in CO2−HCO3-equilibrium as pH changes. Highest apparent photosynthesis at moderate photon flux density (PFD 50 μE m-2 s-1) was found at 15°C and 33‰ S. Photosynthesis was measured up to PFD 500 μE m-2 s-1 and no light saturation was documented. In the present experimental set-up, with continuous supply of fresh seawater, the number of limiting factors during photosynthesis measurements is reduced.
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