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Fig. 14. Changes in the concentrations of size-fractionated chlorophyll a (a, 0.7–5 μm; b, >5 μm), silicic acid (c), phosphate (d), and nitrate (e) in control and experimental bottles enriched with various amounts of iron. The experiments were conducted at Ocean Station P (50°N; 145°W) in September 1998.

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