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Effect of trace metal availability on coccolithophorid calcification

Nature volume 430, pages 673676 (05 August 2004) | Download Citation

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Abstract

The deposition of atmospheric dust into the ocean has varied considerably over geological time1,2. Because some of the trace metals contained in dust are essential plant nutrients which can limit phytoplankton growth in parts of the ocean, it has been suggested that variations in dust supply to the surface ocean might influence primary production3,4. Whereas the role of trace metal availability in photosynthetic carbon fixation has received considerable attention, its effect on biogenic calcification is virtually unknown. The production of both particulate organic carbon and calcium carbonate (CaCO3) drives the ocean's biological carbon pump. The ratio of particulate organic carbon to CaCO3 export, the so-called rain ratio, is one of the factors determining CO2 sequestration in the deep ocean. Here we investigate the influence of the essential trace metals iron and zinc on the prominent CaCO3-producing microalga Emiliania huxleyi. We show that whereas at low iron concentrations growth and calcification are equally reduced, low zinc concentrations result in a de-coupling of the two processes. Despite the reduced growth rate of zinc-limited cells, CaCO3 production rates per cell remain unaffected, thus leading to highly calcified cells. These results suggest that changes in dust deposition can affect biogenic calcification in oceanic regions characterized by trace metal limitation, with possible consequences for CO2 partitioning between the atmosphere and the ocean.

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Acknowledgements

We thank A. Terbrüggen, K.-U. Richter and B. van der Wagt for laboratory assistance, and M. Lohan, K. W. Bruland and R. E. Zeebe for discussions during the preparation of this manuscript. This work was partly funded by the German Research Foundation (DFG).

Author information

Affiliations

  1. Alfred Wegener Institute for Polar and Marine Research, PO Box 120161, 27515 Bremerhaven, Germany

    • K. G. Schulz
    • , I. Zondervan
    •  & U. Riebesell
  2. Leibniz Institute for Marine Sciences (IFM-GEOMAR), Düsternbrooker Weg 20, 24105 Kiel, Germany

    • K. G. Schulz
    •  & U. Riebesell
  3. Royal Netherlands Institute for Sea Research, PO Box 59, 1790 AB Den Burg, Texel, The Netherlands

    • L. J. A. Gerringa
    • , K. R. Timmermans
    •  & M. J. W. Veldhuis

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The authors declare that they have no competing financial interests.

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Correspondence to K. G. Schulz.

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https://doi.org/10.1038/nature02631

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