Effects of Iron limitation on Silicon Metabolism and Silicon Isotopic Discrimination in Southern Ocean Diatoms
The marine biogeochemical cycle of Silicon (Si) in the Southern Ocean is effectively ‘decoupled’ from that of Carbon (C) and Nitrogen (N). This is because the lack of bio- available iron (Fe) in the region prevents the complete utilisation of Nitrate (NO3-) relative to silicic acid (Si(OH)4) by diatoms in Antarctic surface waters. Consequently, higher Si:N and Si:C ratios in Antarctic diatoms results in the preferential export of Si(OH)4 from surface waters relative to NO3-, leading to surface...[Show more]
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