TY - JOUR
T1 - Effects of light on the Ba/Ca ratios in coral skeletons
AU - Yamazaki, Atsuko
AU - Yano, Megumi
AU - Harii, Saki
AU - Watanabe, Tsuyoshi
N1 - Funding Information:
We thank the staff of Sesoko Station, Tropical Biosphere Research Center, University of the Ryukyus, for all of its support. The culture experiments and geochemical analysis were performed in cooperation with T. Komagoe, S. Yoneta, T. K. Watanabe and CREES laboratory members at Hokkaido University. The study was conducted through the financial support of JSPS KAKENHI Grant Number JP17H04708 . We appreciate three reviewers including J. Fietzke to improve the manuscript.
Funding Information:
We thank the staff of Sesoko Station, Tropical Biosphere Research Center, University of the Ryukyus, for all of its support. The culture experiments and geochemical analysis were performed in cooperation with T. Komagoe, S. Yoneta, T. K. Watanabe and CREES laboratory members at Hokkaido University. The study was conducted through the financial support of JSPS KAKENHI Grant Number JP17H04708. We appreciate three reviewers including J. Fietzke to improve the manuscript.
Publisher Copyright:
© 2020 Elsevier B.V.
PY - 2021/1/5
Y1 - 2021/1/5
N2 - The ratios of barium to calcium (Ba/Ca) in reef coral skeletons have been used as a proxy to reconstruct temporal change in barium concentration in surface ocean. To reduce the uncertainty of the coral Ba/Ca proxy, the Ba distribution coefficients between seawater and coral skeletons were determined under different light conditions. Coral planulae (Acropora tenuis) were metamorphosed and settled in dishes with commercial peptide Hym-248 in the laboratory. Juvenile corals were infected with symbiotic algae (Durusdinium sp.) and cultured in 5 Ba concentrations (5, 10, 20, 35, and 150 μmol/mol) for 2 months. Half of the dishes were placed under low light conditions (10–33 μmol m-2 s−1), and another half of the dishes were placed under high light conditions (67–84 μmol m-2 s−1). The Ba/Ca ratios in the coral skeletons were highly correlated with those in ambient seawater under both high and low conditions (R2 > 0.8). The Ba distribution coefficients between seawater with 5–35 μmol/mol of Ba concentration and coral skeletons were 0.72 and 2.83 under high and low light conditions, respectively. These results suggest that biological processes related to light availability could influence to Ba/Cacoral.
AB - The ratios of barium to calcium (Ba/Ca) in reef coral skeletons have been used as a proxy to reconstruct temporal change in barium concentration in surface ocean. To reduce the uncertainty of the coral Ba/Ca proxy, the Ba distribution coefficients between seawater and coral skeletons were determined under different light conditions. Coral planulae (Acropora tenuis) were metamorphosed and settled in dishes with commercial peptide Hym-248 in the laboratory. Juvenile corals were infected with symbiotic algae (Durusdinium sp.) and cultured in 5 Ba concentrations (5, 10, 20, 35, and 150 μmol/mol) for 2 months. Half of the dishes were placed under low light conditions (10–33 μmol m-2 s−1), and another half of the dishes were placed under high light conditions (67–84 μmol m-2 s−1). The Ba/Ca ratios in the coral skeletons were highly correlated with those in ambient seawater under both high and low conditions (R2 > 0.8). The Ba distribution coefficients between seawater with 5–35 μmol/mol of Ba concentration and coral skeletons were 0.72 and 2.83 under high and low light conditions, respectively. These results suggest that biological processes related to light availability could influence to Ba/Cacoral.
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U2 - 10.1016/j.chemgeo.2020.119911
DO - 10.1016/j.chemgeo.2020.119911
M3 - Article
AN - SCOPUS:85093656599
SN - 0009-2541
VL - 559
JO - Chemical Geology
JF - Chemical Geology
M1 - 119911
ER -