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Johanna Stadmark

Johanna Stadmark

Researcher

Johanna Stadmark

Biosilicification drives a decline of dissolved si in the oceans through geologic time

Author

  • Daniel J. Conley
  • Patrick J. Frings
  • Guillaume Fontorbe
  • Wim Clymans
  • Johanna Stadmark
  • Katharine R. Hendry
  • Alan O. Marron
  • Christina L. De La Rocha

Summary, in English

Biosilicification has driven variation in the global Si cycle over geologic time. The evolution of different eukaryotic lineages that convert dissolved Si (DSi) into mineralized structures (higher plants, siliceous sponges, radiolarians, and diatoms) has driven a secular decrease in DSi in the global ocean leading to the low DSi concentrations seen today. Recent studies, however, have questioned the timing previously proposed for the DSi decreases and the concentration changes through deep time, which would have major implications for the cycling of carbon and other key nutrients in the ocean. Here, we combine relevant genomic data with geological data and present new hypotheses regarding the impact of the evolution of biosilicifying organisms on the DSi inventory of the oceans throughout deep time. Although there is no fossil evidence for true silica biomineralization until the late Precambrian, the timing of the evolution of silica transporter genes suggests that bacterial silicon-related metabolism has been present in the oceans since the Archean with eukaryotic silicon metabolism already occurring in the Neoproterozoic. We hypothesize that biological processes have influenced oceanic DSi concentrations since the beginning of oxygenic photosynthesis.

Department/s

  • Quaternary Sciences

Publishing year

2017-12-11

Language

English

Publication/Series

Frontiers in Marine Science

Volume

4

Issue

DEC

Document type

Journal article review

Publisher

Frontiers Media S. A.

Topic

  • Geology
  • Geochemistry

Keywords

  • Biogeochemical cycles
  • Cyanobacteria
  • Diatoms
  • Silicates
  • Sponges

Status

Published

ISBN/ISSN/Other

  • ISSN: 2296-7745