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

Yuji Sano; Sayumi Kobayashi; Kotaro Shirai; Naoto Takahata; Katsumi Matsumoto; Tsuyoshi Watanabe; Kohki Sowa; Kenji Iwai

doi:10.1038/ncomms1763

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

Yuji Sano, Sayumi Kobayashi, Kotaro Shirai, Naoto Takahata, Katsumi Matsumoto, Tsuyoshi Watanabe, Kohki Sowa, Kenji Iwai

Earth and Environmental Sciences-Twin Cities

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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 2μm 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 50μm 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.

Original language	English (US)
Article number	761
Journal	Nature communications
Volume	3
DOIs	https://doi.org/10.1038/ncomms1763
State	Published - 2012

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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 2μm 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 50μm 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.",

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AU - Kobayashi, Sayumi

AU - Shirai, Kotaro

AU - Takahata, Naoto

AU - Matsumoto, Katsumi

AU - Watanabe, Tsuyoshi

AU - Sowa, Kohki

AU - Iwai, Kenji

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

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