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[APD] Effects of CO2 Concentration and Light Intensity on Photosynthesis

I found an abstract of a paper* that seems to suggest that 
photosynthesis actually decreases under high levels of CO2. The 
experiment showed that Ceratophyllum demersum actually decreased its O2 
production at CO2 levels above 3.0 mmol mol-1 (which is 30mg/l I believe).

So, there seems to be an additional data point backing up the idea that 
photosynthesis is saturated at 30ppm as written by Dave Huebert at 
http://www.aquabotanic.com/wp101.htm. Ah, research is fun.

* Adv. Space Res. 2003;31(7):1743-9.

Jerry Baker
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