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Net photosynthesis (μmolO2 gFW −1 hr−1) of Phymatolithon lusitanicum at ~200 μmol photons m−2 s−1 (PAR) incubated for 0, 11, and 20 months under three different CO 2 levels (400, 550, and 750 μatm). Different letters indicate significant differences with CO 2 and time. Values expressed as mean ± standard error (n = 4)
