Abstract
We analyzed sediments and cavernicolous bivalve assemblages within cored sediments recovered from the Daidokutsu submarine limestone cave, which occurs in Pleistocene limestone on the fore-reef slope of Ie Island, off Okinawa, Japan. We found sand-sized brown grains within sediments aged 7,000–6,000 cal BP, and identified the grains as debris derived from a red soil layer developed in coastal zones around the Island. Temporal changes in the abundance of the debris suggest that water flow in the cave weakened at about 6,500 cal BP. Temporal changes in the cavernicolous bivalve assemblages indicate that the environmental conditions of the innermost cave area have gradually spread to the cave entrance over the past 5,000 years. These findings indicate that the filling of cavities within the reefal foundations of the cave has continued over time, resulting in a progressive decrease in the flux of water between the interior and exterior parts of the cave during at least the past 6,500 years. This indicates, in turn, a long-term decline in the functioning of the cryptic community within the reef as a source of the nutrients that support coral reef growth. Our findings regarding the distribution of debris from the red soil layer strongly support the occurrence of a mid-Holocene high-energy window, which represents a period of high wave energy prior to the formation of a reefal barrier.
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Acknowledgments
We gratefully acknowledge K. Konishi, T. Kase, and T. Ubukata for their advice. Thanks are also due to Shigemitsu Kinjyo, Koushin Yasumura for the preparation of samples. We thank A. Beu and an anonymous reviewer, whose comments and suggestions improved the original manuscript. We thank A. Stallard for improving the English in the manuscript. This study was funded by Grants-in-Aid 16340159 and 19540492 awarded by the Japan Society for Promotion of Science, The Japan Science Society, a Sasakawa Scientific Research Grant, and a Grants-in-Aid from the Fukada Geological Institute.
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Yamamoto, N., Kitamura, A., Ohmori, A. et al. Long-term changes in sediment type and cavernicolous bivalve assemblages in Daidokutsu submarine cave, Okinawa Islands: evidence from a new core extending over the past 7,000 years. Coral Reefs 28, 967–976 (2009). https://doi.org/10.1007/s00338-009-0536-2
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DOI: https://doi.org/10.1007/s00338-009-0536-2