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Link between light-triggered Mg-banding and chamber formation in the planktic foraminifera Neogloboquadrina dutertrei

Author

Listed:
  • Jennifer S. Fehrenbacher

    (College of Earth, Ocean and Atmospheric Sciences, Oregon State University
    University of California)

  • Ann D. Russell

    (University of California)

  • Catherine V. Davis

    (University of California)

  • Alexander C. Gagnon

    (School of Oceanography, University of Washington)

  • Howard J. Spero

    (University of California)

  • John B. Cliff

    (Environmental Molecular Sciences Laboratory, Pacific Northwest National Laboratory)

  • Zihua Zhu

    (Environmental Molecular Sciences Laboratory, Pacific Northwest National Laboratory)

  • Pamela Martin

    (3726 Totem Ln)

Abstract

The relationship between seawater temperature and the average Mg/Ca ratios in planktic foraminifera is well established, providing an essential tool for reconstructing past ocean temperatures. However, many species display alternating high and low Mg-bands within their shell walls that cannot be explained by temperature alone. Recent experiments demonstrate that intrashell Mg variability in Orbulina universa, which forms a spherical terminal shell, is paced by the diurnal light/dark cycle. Whether Mg-heterogeneity is also diurnally paced in species with more complex shell morphologies is unknown. Here we show that high Mg/Ca-calcite forms at night in cultured specimens of the multi-chambered species Neogloboquadrina dutertrei. Our results demonstrate that N. dutertrei adds a significant amount of calcite, and nearly all Mg-bands, after the final chamber forms. These results have implications for interpreting patterns of calcification in N. dutertrei and suggest that diurnal Mg-banding is an intrinsic component of biomineralization in planktic foraminifera.

Suggested Citation

  • Jennifer S. Fehrenbacher & Ann D. Russell & Catherine V. Davis & Alexander C. Gagnon & Howard J. Spero & John B. Cliff & Zihua Zhu & Pamela Martin, 2017. "Link between light-triggered Mg-banding and chamber formation in the planktic foraminifera Neogloboquadrina dutertrei," Nature Communications, Nature, vol. 8(1), pages 1-10, August.
    • Handle: RePEc:nat:natcom:v:8:y:2017:i:1:d:10.1038_ncomms15441
    DOI: 10.1038/ncomms15441
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