Inorganic carbon acquisition by red seaweeds grown under dynamic light regimes
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Palmaria palmata, which is able to use HCO inf3 sup− as a carbon source for photosynthesis, and Lomentaria articulata, which is dependent on diffusive uptake of dissolved CO2, were grown under constant light and light with sunflecks designed to model wave-induced fluctuations of near-shore underwater light. Both species exhibited significantly increased stable carbon isotope discrimination (more negative values of δ13C relative to PDB) when grown with sunflecks. More negative δ13C values were associated with decreased growth rate of P. palmata but not of L. articulata. The contrasting effects of sunflecks on the carbon-use characteristics of the two species are discussed in terms of the energetic cost of HCO inf3 sup− use and the susceptibility of CO2 diffusion-dependent species to photoinhibition.
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- Inorganic carbon acquisition by red seaweeds grown under dynamic light regimes
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