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The acclimation responses of two intertidal macroalgae,  Gracilaria  sp. and  Enteromorpha intestinalis , to different dissolved inorganic carbon (DIC) levels were investigated under laboratory conditions. The effect of DIC availability on growth rate, biochemical composition (C, N, pigments and Rubisco) and on the degree of inhibition of external and total carbonic anhydrase activities (by acetazolamide and 6-ethoxyzolamide, respectively), and of a putative HCO 3  −  exchanger protein (sensitive to the inhibitor 4,4′-diisothiocyanatostilbene-2,2′-disulfonate, DIDS) was species-specific. Pigment and Rubisco contents co-varied negatively with DIC availability in  Gracilaria  sp. However, no such pattern was observed in  Enteromorpha intestinalis . The mechanisms of DIC uptake were also modulated by the external DIC concentration. Under limiting DIC conditions, the induction of mechanisms for CO 2  acquisition above the diffusive rate was observed in  Gracilaria  sp., while a repression of the DIDS-sensitive mechanism was obtained for  Enteromorpha intestinalis . The results revealed the plasticity of these intertidal macroalgae to acclimate to different ambient DIC levels, and indicate the important role of DIC as a factor controlling biochemical and physiological processes.

botanica marina

Acclimation Responses of  Gracilaria  sp. (Rhodophyta) and  Enteromorpha intestinalis  (Chlorophyta) to Changes in the External Inorganic Carbon Concentration