Daily environmental changes recorded in deep-sea corals : reconstruction of the ocean surface environment over 50 years

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The skeleton of Flabellum(F.) magnificum provides a record of environmental variables at various time scales. The different time scales are preserved by different elements of the skeletal structure of this species. In particular, temporal changes in Sr/Ca, Ba/Ca, and Mn/Ca ratios during corallite growth reflect environmental fluctuations(e. g., nutrient availability, hydrothermal activity) at the ocean surface and in deep-sea areas. In addition, circadian rhythmicity was detected in polyp activity, and circadian clock genes were identified. In the future, it will be possible to reconstruct temporal fluctuations in the ocean environment over a period of 50 years, based on analyses of the composition of the skeleton of F. magnificum.