Correction to: The carbon-concentrating mechanism of the extremophilic red microalga Cyanidioschyzon merolae

Correction to: Photosynthesis Research (2023) 156:247–264 10.1007/s11120-023-01000-6

After publication, we discovered that an isotopically light CO₂ source was leaking into our incubator during the time that cells were growing for δ¹³C analysis. As CCMs are associated with isotopically heavier δ¹³C signatures and supplementary CO₂ may suppress CCMs or otherwise result in increased carbon isotope selectivity, we repeated the δ¹³C experiment with comparable methods and obtained a new C. merolae biomass δ¹³C value of − 19.75 ± 0.94‰ (mean ± 2 SEs) which is heavier than the previously reported value of − 23.03 ± 0.16‰. Our original conclusion of C. merolae’s biomass δ¹³C being consistent with a CCM is unaffected by this corrected result and even strengthened since the shift is to an isotopically heavier signature.