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Chlorophyll a concentrations (open circles) and prokaryotic (bacterial and archaeal) cell numbers (solid circles) in incubations of non-axenic S. costatum strain CCAP1077/1C amended with (a) or without (b) ANS crude oil – respectively flasks O1-3 and C4-6. The hatched line at day 7 (top panel) indicates the time-point the oil was added. Note difference in scale of the left-hand y-axis in the two plots. Some error bars are smaller than the symbol.
