<div>Carbon dioxide had a significant effect on LEDR per cm2 (p=0.0352) and on dark respiration (p=0.0467) and LEDR (p=0.0347) standardised to µg Chlorophyll c2. The rate of dark respiration per µg Chlorophyll c2 was significantly greater in the high CO2 treatment (-0.907± 0.104 s.e.µmol O2 cm-1 s-1) compared to the low CO2 treatment (-0.723±0.052 s.e. µmol O2 cm-1 s-1). Likewise, the rate of light enhanced dark respiration per cm2 and per µg Chlorophyll c2 was significantly greater in the high CO2 treatment (-0.586±0.032 s.e. µmol O2 cm-1 s-1, -0.879±0.095 s.e. µmol O2 µg -1 s-1) than in the low CO2 treatment (-0.506±0.026 s.e. µmol O2 cm-1 s-1,&nbsp; -0.691±0.056 s.e. µmol O2 µg -1 s-1).<br></div>