TY - JOUR
T1 - Geochemical and Microstructural Signals in Giant Clam Tridacna maxima Recorded Typhoon Events at Okinotori Island, Japan
AU - Komagoe, Taro
AU - Watanabe, Tsuyoshi
AU - Shirai, Kotaro
AU - Yamazaki, Atsuko
AU - Uematu, Mitsuo
N1 - Funding Information:
Sampling of Okinotori giant clam occurred with the help of the crew on the R/V Hakuhoumaru KH-06-2. Sections of the shell specimen were prepared with the technical support of Tsuzumi Miyaji, Hidehiko Nomura, and Kousuke Nakamura. We acknowledge Tomohisa Irino for performing stable isotope measurement and Shirai laboratory members for conducting trace element analysis. The environmental data set was provided by Chika Sakata, M.S. 2006. This study was supported by JSPS KAHENHI grants JP 25257207, 15H03742 and 17H04708. All data available in the supporting information.
Funding Information:
In the originally published version of this paper, one of the funding sources, SPS KAHENHI grant JP 17H04708, was omitted from the acknowledgment section. This error has since been corrected, and this version can be considered the authoritative version.
Publisher Copyright:
©2018. American Geophysical Union. All Rights Reserved.
PY - 2018/5
Y1 - 2018/5
N2 - To validate the usability of the giant clam shell as a recorder of short-term environmental changes such as typhoons, we collected a live Tridacna maxima from Okinotori Island, Japan, on 15 June 2006. Growth increment thickness, stable isotope ratio (δ18Oshell, δ13Cshell), and the barium/calcium ratio (Ba/Ca) in the T. maxima shell sample were measured and compared to Okinotori Island instrumental environmental data. In the outer layer of the shell sample, there were 365 ± 6 growth increments per year, as estimated by the δ18Oshell profile compared with sea surface temperature. The growth increments in the specimen were formed daily, and thus, we can determine the date of the sampling points of δ18Oshell, δ13Cshell and the Ba/Ca ratio by counting growth increments. After typhoon approach, there is a decrease in increment thickness and some disturbed growth increments. The positive peaks in the shell Ba/Ca ratio and δ18Oshell corresponded to lower sea surface temperature caused by typhoons. These results indicated that the microstructural and geochemical record in Tridacna maxima shells could be useful for detecting past typhoon events.
AB - To validate the usability of the giant clam shell as a recorder of short-term environmental changes such as typhoons, we collected a live Tridacna maxima from Okinotori Island, Japan, on 15 June 2006. Growth increment thickness, stable isotope ratio (δ18Oshell, δ13Cshell), and the barium/calcium ratio (Ba/Ca) in the T. maxima shell sample were measured and compared to Okinotori Island instrumental environmental data. In the outer layer of the shell sample, there were 365 ± 6 growth increments per year, as estimated by the δ18Oshell profile compared with sea surface temperature. The growth increments in the specimen were formed daily, and thus, we can determine the date of the sampling points of δ18Oshell, δ13Cshell and the Ba/Ca ratio by counting growth increments. After typhoon approach, there is a decrease in increment thickness and some disturbed growth increments. The positive peaks in the shell Ba/Ca ratio and δ18Oshell corresponded to lower sea surface temperature caused by typhoons. These results indicated that the microstructural and geochemical record in Tridacna maxima shells could be useful for detecting past typhoon events.
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U2 - 10.1029/2017JG004082
DO - 10.1029/2017JG004082
M3 - Article
AN - SCOPUS:85046535429
SN - 2169-8953
VL - 123
SP - 1460
EP - 1474
JO - Journal of Geophysical Research: Biogeosciences
JF - Journal of Geophysical Research: Biogeosciences
IS - 5
ER -