Decreased net photosynthetic O2 evolution rates of algae with increased external partial pressure ratio of O2 to CO2 or respiration index (log10(pO2/pCO2). A,B,C panels represent respectively the diatoms of Thalassiosira pseudonana and Phaeodactylum tricornutum and a green alga, Ulva prolifera, grown under elevated (HC, 1000 μatm) or ambient (LC, 390 μatm)
(re-constructed from Gao et al. 2012, Xu and Gao 2012).