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(a) Calcification/growth rates (μmolCaCO 3 gFW −1 day−1) and (b) total cumulative growth (μmolCaCO3/gFW) of Phymatolithon lusitanicum thalli cultivated under low light ambient irradiance (8 μmol photos m−2 s−1) at three different CO 2 levels (400, 550 and 750 μatm) after 7, 12, 16, and 20 months of high CO 2. Results calculated using the buoyant weight technique. Different letters indicate significant differences with CO 2 and time. Values expressed as mean ± standard error (n = 90)
