COSEE Ocean Systems: News
Modulation of oxygen production in Archaean oceans by episodes of Fe(II) toxicity
Description: Researchers test the hypothesis that the upwelling of Fe(II)-rich, anoxic water into the photic zone during the late Archaean subjected oxygenic phototrophic bacteria to Fe(II) toxicity. In laboratory experiments, they found that supplying Fe(II) to the anoxic growth medium housing a common species of planktonic cyanobacteria decreased both the efficiency of oxygenic photosynthesis and their growth rates. They use geochemical modelling to show that Fe(II) toxicity in conditions found in the late Archaean photic zone could have substantially inhibited water column oxygen production, thus decreasing fluxes of oxygen to the atmosphere. [Source: Nature Geoscience]
Availability: Summary
Source: Nature Geoscience
Publish Date: 2/1/2015
Reading Level: Expert
Page Length: