Phytoplankton growth rate, cell volume, carbon content, and C:N ratio.

Average values grouped by target pCO2 treatment, with the standard deviation of (n) measurements. Cell volume was measured via Coulter counter in five replicate samples from each days’ feeding cultures, growth rate was calculated from the average cell count of those five replicates; C:N samples were taken opportunistically over the course of the experiment (sampled on 7 days in Exp 12C; 4 days Exp 17C).