Abstract
We have screened five green freshwater microalgae for tolerance to high CO 2 concentrations. Scenedesmus and Chlorella showed much higher log phase growth rates than the other three strains tested. Scenedesmus was better able to tolerate very high CO 2 concentrations than Chlorella. However, both algae had about the same growth rate when the CO 2 concentration was in the range 10–30%. Chlorella was better able to tolerate elevated temperatures. The two algae had very similar light response curves. Scenedesmus was completely inhibited by 100% CO 2. This inhibition was reversible since growth was resumed when the CO 2 concentration was returned to 20%.
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