Photosynthesis and respiration in the alga Ahnfeltia plicata in a flow-through system |
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Authors: | K Haglund L Axelsson M Pedersén |
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Institution: | (1) Department of Physiological Botany, University of Uppsala, P.O. Box 540, S-75121 Uppsala, Sweden;(2) Kristineberg Marine Biological Station, S-450 34 Fiskebäckskil, Sweden |
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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–HCO
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equilibrium as pH changes. Highest apparent photosynthesis at moderate photon flux density (PFD 50 E m-2 s-1) was found at 15°C and 33 S. Photosynthesis was measured up to PFD 500 E 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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