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Fig. 30. Relationship between nitrate and silicic acid concentrations at 5- to 10-m depth inside and outside of the iron-enriched waters measured during SEEDS and SERIES. The lines and Si/N ratio designate the linear regression lines and slopes of the plots. Separate regression analysis was conducted for the data obtained from inside the iron-enriched waters due to a kink after the onset of algal physiological stress confirmed by changes in photochemical quantum efficiency (Fv/Fm).

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