Iron-limited diatom growth and Si:N uptake ratios in a coastal upwelling regime

Article Abstract:

There is evidence that phytoplankton growth is restricted by the availability of iron in the subarctic Pacific and equatorial Pacific and Southern oceans. Shipboard seawater incubation experiments have been undertaken which show that phytoplankton are iron-limited in The Californian coastal upwelling region. The addition of iron to nearshore high-nitrate, low-chlorophyll (HNLC) waters encourages the blooms of large chain-forming diatoms. Diatoms lacking iron will deplete surface waters of silicic acid resulting in the secondary silicic acid limitation of phytoplankton.

Diatoms

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Complex lessons of iron uptake

Article Abstract:

Hutchins and colleagues have compared the capabilities of cyanobacteria and diatoms to acquire iron from a range of organic liquids. They suggested that uptake of bound iron could involve specific cell-surface siderophore receptors. Diatoms are believed to use a non-specific cell-surface enzymes. Progress in understanding the effects of iron on phytoplankton growth shows that microbial activity modifies ocean chemistry.

Observations, Oceanographic research

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Effect of iron supply on Southern Ocean CO2 uptake and implications for glacial atmospheric CO2

Article Abstract:

It has been shown that surface uptake of atmospheric CO2 and uptake of silica and carbon by phytoplankton in the Southern Ocean, were strongly affected by nanomolar increases of iron concentrations.

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