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The percentage of the estimated water-column phytoplankton production captured in a sediment trap as fecal pellets at 15 m (total depth = 20 m) vs. the average Si:DIN atomic ratio in riverine water for the 90 days before the middle of the sediment-trap deployment period. The data table for this figure appears as supplementary material on the PNAS web site (www.pnas.org).
