Abstract

Diatoms sustain the marine food web and contribute to the export of carbon from the surface ocean to depth. They account for about 40% of marine primary productivity and particulate carbon exported to depth as part of the biological pump. Diatoms have long been known to be abundant in turbulent, nutrient-rich waters, but observations and simulations indicate that they are dominant also in meso- and submesoscale structures such as fronts and filaments, and in the deep chlorophyll maximum. Diatoms vary widely in size, morphology and elemental composition, all of which control the quality, quantity and sinking speed of biogenic matter to depth. In particular, their silica shells provide ballast to marine snow and faecal pellets, and can help transport carbon to both the mesopelagic layer and deep ocean. Herein we show that the extent to which diatoms contribute to the export of carbon varies by diatom type, with carbon transfer modulated by the Si/C ratio of diatom cells, the thickness of the shells and their life strategies; for instance, the tendency to form aggregates or resting spores. Model simulations project a decline in the contribution of diatoms to primary production everywhere outside of the Southern Ocean. We argue that we need to understand changes in diatom diversity, life cycle and plankton interactions in a warmer and more acidic ocean in much more detail to fully assess any changes in their contribution to the biological pump.

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Acknowledgements

The authors thank Sébastien Hervé (IUEM) for his artwork. This study was supported by the SILICAMICS project funded by the Euromarine Consortium, the LABEX-Mer (French Government ‘Investissement d’Avenir’ programme, ANR-10-LABX-19-01) and the Région de Bretagne. S.D. and O.J. acknowledge funding from National Science Foundation (grant OCE-1434007, OCE-1259388, OCE-1048897) and the National Aeronautics and Space Administration (NNX16AR47G). C.B. acknowledges funding from the ERC Advanced Award ‘Diatomite’, the Louis D. Foundation, the Gordon and Betty Moore Foundation and the French Government ‘Investissements d’Avenir’ programmes MEMO LIFE (ANR-10-LABX-54), PSL Research University (ANR-1253 11-IDEX-0001-02) and OCEANOMICS (ANR-11-BTBR-0008). C.B. also thanks the Radcliffe Institute of Advanced Study at Harvard University for a scholar’s fellowship during the 2016–2017 academic year. B.M. acknowledges funding from the Agence Nationale de la Recherche ‘BIOPSIS’ grant. This article is contribution number 65 of Tara Oceans.

Author information

Affiliations

  1. Marine Environmental Sciences Laboratory (LEMAR, UMR 6539) at the European Institute for Marine Studies, Université de Bretagne Occidentale, CNRS, Plouzané, France

    • Paul Tréguer
    • , Brivaela Moriceau
    •  & Philippe Pondaven
  2. Institut de biologie de l’Ecole normale supérieure, Ecole normale supérieure, CNRS, INSERM, PSL Research University, Paris, France

    • Chris Bowler
  3. Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, MA, USA

    • Stephanie Dutkiewicz
    •  & Oliver Jahn
  4. Laboratoire des Sciences du Climat et de l’Environnement, Institut Pierre Simon Laplace, CEA-CNRS-UVSQ, Orme des Merisiers, Gif-sur-Yvette, Paris, France

    • Marion Gehlen
  5. Sorbonne Universités (UPMC Univ Paris 06)/CNRS/IRD/MNHN, Laboratoire d’Océanographie et du Climat, Institut Pierre Simon Laplace, Paris, France

    • Olivier Aumont
    •  & Marina Levy
  6. Sorbonne Universités, UPMC Univ Paris 06, Univ Antilles Guyane, Univ Nice Sophia Antipolis, CNRS, Evolution Paris Seine, Institut de Biologie Paris Seine, Paris, France

    • Lucie Bittner
  7. Romberg Tiburon Center, San Francisco State University, Tiburon, CA, 94920, USA

    • Richard Dugdale
  8. Environmental Science Program, Mount Allison University, Sackville, NB, Canada

    • Zoe Finkel
  9. Stazione Zoologica Anton Dohrn, Naples, Italy

    • Daniele Iudicone
  10. Sorbonne Universités, UPMC Université Paris 06, CNRS, Laboratoire d’océanographie de Villefranche, Observatoire Océanologique, Villefranche-sur-Mer, France

    • Lionel Guidi
  11. Aix-Marseille Université, Université de Toulon, CNRS, IRD, MIO, UM110, Marseille, France

    • Marine Lasbleiz
    •  & Karine Leblanc

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Contributions

P.T. coordinated the manuscript and figures. P.T., C.B., B.M., S.D., M.G., K.L., O.A., L.B., R.D., Z.F., L.G., D.I., M.La., M.Le., & P.P. all contributed to writing the manuscript. P.T., B.M., S.D., K.L., L.B., O.J. & P.P. worked on the figures. All authors read and approved the manuscript.

Competing interests

The authors declare no competing financial interests.

Corresponding author

Correspondence to Paul Tréguer.

Supplementary information

  1. Supplementary Information

    Supplementary information and figures.

About this article

Publication history

Received

Accepted

Published

DOI

https://doi.org/10.1038/s41561-017-0028-x

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