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Past daily light cycle recorded in the strontium/calcium ratios of giant clam shells

Author

Listed:
  • Yuji Sano

    (Atmosphere and Ocean Research Institute, University of Tokyo)

  • Sayumi Kobayashi

    (Atmosphere and Ocean Research Institute, University of Tokyo
    Present address: Toshiba Electronic Company.)

  • Kotaro Shirai

    (Atmosphere and Ocean Research Institute, University of Tokyo)

  • Naoto Takahata

    (Atmosphere and Ocean Research Institute, University of Tokyo)

  • Katsumi Matsumoto

    (University of Minnesota)

  • Tsuyoshi Watanabe

    (Hokkaido University)

  • Kohki Sowa

    (Hokkaido University)

  • Kenji Iwai

    (Ishigaki Branch, Research Center of Fishery and Oceanography at Okinawa Prefecture)

Abstract

The historical record of daily light cycle in tropical and subtropical regions is short. Moreover, it remains difficult to extract this cycle in the past from natural archives such as biogenic marine carbonates. Here we describe the precise analysis of Sr/Ca, Mg/Ca, and Ba/Ca ratios in a cultivated giant clam shell, using a laterally high-resolution secondary ion mass spectrometer with 2 μm resolution. The Sr/Ca ratio exhibits striking diurnal variations, reflecting the daily light cycle. A clear seasonal variation in Sr/Ca is also observed in another longer set of measurements with 50 μm resolution. Light-enhanced calcification and elemental transportation processes, in giant clam and symbiotic algae, may explain these diurnal and annual variations. This opens the possibility to develop the Sr/Ca ratio from a giant clam shell as an effective proxy for parameters of the daily light cycle.

Suggested Citation

  • Yuji Sano & Sayumi Kobayashi & Kotaro Shirai & Naoto Takahata & Katsumi Matsumoto & Tsuyoshi Watanabe & Kohki Sowa & Kenji Iwai, 2012. "Past daily light cycle recorded in the strontium/calcium ratios of giant clam shells," Nature Communications, Nature, vol. 3(1), pages 1-6, January.
    • Handle: RePEc:nat:natcom:v:3:y:2012:i:1:d:10.1038_ncomms1763
    DOI: 10.1038/ncomms1763
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