Pelagic photoferrotrophy and iron cycling in a modern ferruginous basin

Scientific Reports
Marc LlirósSean A Crowe

Abstract

Iron-rich (ferruginous) ocean chemistry prevailed throughout most of Earth's early history. Before the evolution and proliferation of oxygenic photosynthesis, biological production in the ferruginous oceans was likely driven by photoferrotrophic bacteria that oxidize ferrous iron {Fe(II)} to harness energy from sunlight, and fix inorganic carbon into biomass. Photoferrotrophs may thus have fuelled Earth's early biosphere providing energy to drive microbial growth and evolution over billions of years. Yet, photoferrotrophic activity has remained largely elusive on the modern Earth, leaving models for early biological production untested and imperative ecological context for the evolution of life missing. Here, we show that an active community of pelagic photoferrotrophs comprises up to 30% of the total microbial community in illuminated ferruginous waters of Kabuno Bay (KB), East Africa (DR Congo). These photoferrotrophs produce oxidized iron {Fe(III)} and biomass, and support a diverse pelagic microbial community including heterotrophic Fe(III)-reducers, sulfate reducers, fermenters and methanogens. At modest light levels, rates of photoferrotrophy in KB exceed those predicted for early Earth primary production, and are suffici...Continue Reading

References

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Citations

Oct 22, 2016·Environmental Microbiology·Jasmine S BergMarcel M M Kuypers
Feb 9, 2017·Environmental Microbiology·Andreas Kappler, Casey Bryce
Apr 1, 2017·Genome Announcements·Sean A CroweSteven J Hallam
Mar 6, 2018·Annual Review of Plant Biology·Vera ThielDonald A Bryant
Jun 20, 2018·Applied and Environmental Microbiology·Casey BryceAndreas Kappler
Jul 31, 2018·Environmental Microbiology·Casey BryceAndreas Kappler
Feb 24, 2019·Applied and Environmental Microbiology·Chao PengAndreas Kappler
Jan 7, 2020·Environmental Science. Processes & Impacts·Ulf LuederCaroline Schmidt
Jul 11, 2019·Nature Communications·Kazumi OzakiChristopher T Reinhard
Apr 6, 2017·Frontiers in Microbiology·Antonio CamachoJakob Zopfi
Jul 22, 2017·Frontiers in Microbiology·Katharine J ThompsonSean A Crowe
Sep 25, 2018·Frontiers in Microbiology·Nathaniel W FortneyEric E Roden
May 15, 2018·Frontiers in Microbiology·Sebastian HaasJennifer L Macalady
Feb 20, 2018·Limnology and Oceanography·Shiyu Rachel WangCharles S Hopkinson
Feb 3, 2021·Nature Reviews. Microbiology·Andreas KapplerElizabeth D Swanner
Mar 5, 2021·Geobiology·Eric Siciliano RegoAdriana de Cássia Zapparoli

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Methods Mentioned

BETA
flow cytometry

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