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Mineral Components of Scleractinian Coral Skeletons Cultured Without Symbionts

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Title: Mineral Components of Scleractinian Coral Skeletons Cultured Without Symbionts
Authors: Motai, S. Browse this author
Kawano, J. Browse this author
Harii, S. Browse this author
Seto, Y. Browse this author
Watanabe, T. Browse this author →KAKEN DB
Nagai, T. Browse this author
Keywords: biomineralization
scleractinian corals
polymorph selection
calcium carbonate
symbiotic relationship
Issue Date: Feb-2022
Publisher: American Geophysical Union
Journal Title: Journal of geophysical research biogeosciences
Volume: 127
Issue: 2
Start Page: e2021JG006574
Publisher DOI: 10.1029/2021JG006574
Abstract: Skeletons of contemporary reef-building scleractinian corals are formed of aragonite, a polymorph of the calcium carbonate (CaCO3), notwithstanding calcite being a more stable phase under the condition of coral habitats. Circumstances developing aragonite in coral calcification have been addressed currently. Considering that the symbiotic relationship between the coral host and dinoflagellate algae (zooxanthellae) is perhaps relevant to coral calcification, we studied the impact of these symbiotic relationships on CaCO3 polymorph selection. Juvenile scleractinian corals (Acropora tenuis and Acropora digitifera) absent symbionts were cultured in seawaters with varied Mg/Ca molar ratios (mMg/Ca), and the mineral phases of the skeletons were detected employing X-ray diffraction. The findings revealed that diminutive quantities of calcite precipitated as coral skeleton in Acropora digitifera surprisingly in pseudo-present seawater (mMg/Ca similar to 5). Additionally, coral developed skeletons from only calcite in seawater with an mMg/Ca < 1. The evidence gathered in this investigation suggests that the symbiotic relationship affects the establishment of aragonite skeletons in the course of coral calcification.
Rights: Copyright 2022 American Geophysical Union
Type: article
Appears in Collections:理学院・理学研究院 (Graduate School of Science / Faculty of Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 永井 隆哉

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