Biomass recycling and Earth's early phosphorus cycle
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Phosphorus sets the pace of marine biological productivity on geological time scales. Recent estimates of Precambrian phosphorus levels suggest a severe deficit of this macronutrient, with the depletion attributed to scavenging by iron minerals. We propose that the size of the marine phosphorus reservoir was instead constrained by muted liberation of phosphorus during the remineralization of biomass. In the modern ocean, most biomass-bound phosphorus gets aerobically recycled; but a dearth of oxidizing power in Earth’s early oceans would have limited the stoichiometric capacity for remineralization, particularly during the Archean. The resulting low phosphorus concentrations would have substantially hampered primary productivity, contributing to the delayed rise of atmospheric oxygen.
Kipp , M & Stueeken , E E 2017 , ' Biomass recycling and Earth's early phosphorus cycle ' , Science Advances , vol. 3 , no. 11 , eaao4795 . https://doi.org/10.1126/sciadv.aao4795
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DescriptionThis work was supported by NSF Graduate Research Fellowship DGE-1256082 to M.A.K., a NASA Postdoctoral Fellowship to E.E.S., NASA Exobiology grant NNX16AI37G, and NASA Astrobiology Institute grant NNA13AA93A.
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