Figure 3.

Short‐term modulations in external inorganic carbon (C_i) fluxes of Emiliania huxleyi in response to low dissolved inorganic carbon (DIC)/high pH (L_DICH _pH; white bars), as well as carbonation (H_DICH _pH; dashed, light grey bars), acidification (L_DICL _pH; light grey bars) and the combination of both (H_DICL _pH; dashed, dark grey bars): Chla‐normalized photosynthetic net CO ₂ uptake (CO ₂upt_PS; a, b), photosynthetic HCO₃ ⁻ uptake (HCO₃ ⁻upt_PS; c, d) and the fraction of overall photosynthetic net C_i uptake that is covered by net CO ₂ uptake ($f_{{\mathrm{CO}}_2}$; e, f) were measured at low and high photon flux densities (PFD; 180 and 700 μmol photons m⁻² s⁻¹). Data are shown for the diploid life‐cycle stage acclimated to low and high light (2N LL, 2N HL). Note: in 2N HL, no data for the L_DICL _pH condition were obtained. Error bar indicate mean ± SD (n = 3). Different lower‐case characters indicate significant differences between the fluxes obtained at different carbonate chemistry conditions and same PFD.