International Journal of Ecology / 2009 / Article / Tab 1

Research Letter

Effect of Low pH on Carbohydrate Production by a Marine Planktonic Diatom (Chaetoceros muelleri)

Table 1

Chaetoceros muelleri biomass and growth. Actual pH was the pH measured over the course of 6 days in culture. Growth rate derived from changes in in vivo chlorophyll fluorescence between days 2 and 5. Biomass is expressed as diatom concentration (cells m L 1 ) and chlorophyll a (chl. a) concentration ( 𝜇 g L 1 ). These data were used to calculate chl. a content per cell (fg cel l 1 ) on day 5. Values are means ± standard deviation ( 𝑛 = 6 replicate cultures).

pHActual pHGrowth rate ( 𝜇 )Doubling time (days)Cells m L 1 chl. a ( 𝜇 g L 1 )chl. a (fg cel l 1 )

6.8 6 . 8 2 ± 0 . 0 4 0 . 1 9 ± 0 . 0 1 1 . 5 5 ± 0 . 0 5 1 . 3 6 × 1 0 6 ± 6 . 8 9 × 1 0 4 518 ± 89378 ± 50
7.4 7 . 4 2 ± 0 . 0 4 0 . 2 4 ± 0 . 0 2 1 . 2 7 ± 0 . 1 0 1 . 8 3 × 1 0 6 ± 9 . 2 6 × 1 0 4 687 ± 141375 ± 76
7.9 7 . 9 3 ± 0 . 0 4 0 . 2 5 ± 0 . 0 1 1 . 2 2 ± 0 . 0 3 1 . 8 4 × 1 0 6 ± 8 . 8 4 × 1 0 4 644 ± 80351 ± 45
8.2 8 . 2 3 ± 0 . 0 5 0 . 2 5 ± 0 . 0 1 1 . 2 0 ± 0 . 0 7 1 . 6 5 × 1 0 6 ± 8 . 0 8 × 1 0 4 637 ± 68388 ± 55

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