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Experiments 5 (a) and 6 (b). Day- and night-averaged percentages of assimilated 35S-DMSP by organisms sized 0.65–3 μm (black bars) and 0.22–0.65 μm (dashed bars) as measured every 4 h during a 24 h cycle. Values are mean±standard errors of 3–4 data points. *Significant differences between both size fractions (analysis of variance (ANOVA), P<0.05).
