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2018, Vol.47, No.4

566-569

Influence of Acidification on Carbonate Sediments of Majuro Atoll, Marshall Islands

Lisa Ito ,*1Toru Yamaguchi ,2Ryuta Kobayashi ,2Yasuko Terada ,3 and Yoshio Takahashi *1
1Graduate School of Science, The University of Tokyo, Bunkyo, Tokyo 113-0033, Japan
2Faculty of Letters, Keio University, Minato, Tokyo 108-8345, Japan
3Japan Synchrotron Radiation Research Institute/SPring-8, Kouto, Sayo, Hyogo 679-5198, Japan
https://doi.org/10.1246/cl.171236

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Abstract

Influence of acidification on carbonate sediments in Majuro Atoll, Marshall Islands was studied by chemical and mineralogical methods coupled with synchrotron-based X-ray µ-CT. We found that the lowering of soil pH near the surface layer caused decrease of Mg concentration and increase of porosity of foraminifera (Calcarina spp.) due to the selective dissolution of magnesian calcite in Calcarina spp.test.

figure

Soil acidification which occurs in the surface sediments of Majuro Atoll promotes selective dissolution of Mg-calcite, which compose the foraminifera (Calcarina spp.) tests. Corroboration by X-ray µ-CT and ImageJ makes it possible to quantify the volume of avoids of Calcarina spp. This technic can also be applied to evaluation of the influence of ocean acidification to small aquatic organisms.

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