Dark respiration rates of <i>P. tricornutum</i>.

<p>Dark respiration rates (a) per cell or (b) per chl <i>a</i> cultured in LC-HN, LC-LN, HC-HN and HC-LN grown cells. The different letters above the bars indicate significant differences among the treatments at the <i>P</i>&lt;0.05 level. Vertical bars are means ±SD, except the HC-LN treatments that had 2 replicates, all other data are from 4 replicates.