Literature DB >> 22453834

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

Yuji Sano1, Sayumi Kobayashi, Kotaro Shirai, Naoto Takahata, Katsumi Matsumoto, Tsuyoshi Watanabe, Kohki Sowa, Kenji Iwai.   

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.

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Year:  2012        PMID： 22453834     DOI： 10.1038/ncomms1763

Source DB:  PubMed          Journal:  Nat Commun        ISSN： 2041-1723            Impact factor:   14.919


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  15 in total

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