Table 1.
Diatom stocks and rates during the 2017 spring bloom cycle (±standard error, n.d. indicates no data).
| Day-Month | Si(OH)4 (µmol L−1) | Diatom Biomass (106 µm3 L−1) | bSiO2 (µmol Si L−1) | bSiO2 product-ion (µmol Si L−1 d−1) | bSiO2-normalized production (d−1) | Net Diatom Growth, (d−1) | Weighted Diatom Sedimentation (m d−1) | Non-living bSiO2 (µmol Si L−1) | %bSiO2 production met by bSiO2 dissolution† |
|---|---|---|---|---|---|---|---|---|---|
| 18–04 | 4.53 | 233 | 0.26 ± 0.01 | 0.00 ± 0.00 | 0.02 ± 0.01 | 0.03 ± 0.01 | n.d. | 0.19* | 40.2% |
| 27–04 | 3.41 | 639 | 0.60 ± 0.00 | 0.01 ± 0.00 | 0.02 ± 0.00 | 0.03 ± 0.01 | n.d. | 0.45* | 48.6% |
| 05–05 | 1.85 | 1050 | 1.43 ± 0.12 | 0.11 ± 0.02 | 0.07 ± 0.01 | 0.13 ± 0.05 | 4.00 ± 3.53 | 0.27 | 2.6% |
| 10–05 | 1.80 | 1570 | 1.67 ± 0.03 | 0.24 ± 0.01 | 0.13 ± 0.01 | 0.06 ± 0.02 | 0.91 ± 0.75 | 0.65 | 2.7% |
| 17–05 | 0.47 | 1250 | 1.60 ± 0.11 | 0.09 ± 0.01 | 0.05 ± 0.01 | −0.08 ± 0.03 | 1.07 ± 0.27 | 0.61 | 6.9% |
| 24–05 | 0.79 | 1020 | 1.08 ± 0.07 | 0.10 ± 0.00 | 0.09 ± 0.01 | −0.03 ± 0.01 | 4.29 ± 2.34 | 0.32 | 3.1% |
| 30–05 | 2.41 | 484 | 1.37 ± 0.05 | 0.04 ± 0.02 | 0.03 ± 0.01 | −0.06 ± 0.03 | 3.81 ± 0.75 | 0.47 | 12.9% |
Diatom cell counts were converted to biovolume based on morphometrics of each species and summed for biomass measurement. Individual species modal sedimentation rates were determined (Table S2) and the total rate was scaled to diatom contribution to total biovolume (Table S1). Using viability information, i.e. diatom biovolume, the bSiO2 pool was split into the fraction associated with non-living diatoms. Based on the non-living-associated bSiO2 pool and assuming a specific dissolution rate (†see text) of 0.01 d−1, the %bSiO2 production supported by bSiO2 dissolution (i.e. remineralization) was estimated. *Assumes 75% non-living since no viability information available.