Carbon and Oxygen Isotope Records of Tridacna squamosa Shells from two Different Latitudes in the Ryukyu Islands

IF 0.6 4区地球科学 Q3 PALEONTOLOGY

Paleontological Research Pub Date : 2021-04-01 DOI:10.2517/2020PR003

S. Kodama, H. Takayanagi, Kosuke Yoshii, Thuy Thi Nhu Ha, R. Asami, O. Abe, Y. Iryu

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引用次数: 2

Abstract

Abstract. We report carbon (δ13C) and oxygen (δ18O) isotope records of two modern giant clam (Tridacna squamosa) shells from two sites (Ishigaki-jima and Okinoerabu-jima) at different latitudes in the Ryukyu Islands, Japan. The δ13C profiles of samples from the inner shell layer on cross-sections along the maximum growth axis display no ontogenetic trends or seasonal variations. This finding suggests that the calcification site is likely to be unaffected by CO2 uptake and release resulting from the metabolic activity of the molluscan host and algal symbionts. The δ18O profiles show distinct seasonal cycles. After accounting for the influence of seawater δ18O, the time-series variations are consistent with variations in sea surface temperature, and the temperature dependency of oxygen isotope fractionation is nearly identical to previously published δ18O–temperature relationships for biogenic and synthetic aragonite. We conclude that δ18O records from pristine fossils of this species will enable accurate paleoenvironmental reconstructions at high temporal resolution.

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琉球群岛两个不同纬度鳞虫壳的碳氧同位素记录

摘要我们报道了来自日本琉球群岛不同纬度的两个地点（石垣岛和冲绳岛）的两个现代巨型蛤壳的碳（δ13C）和氧（δ18O）同位素记录。内壳层样品在沿最大生长轴的横截面上的δ13C剖面没有显示个体发生趋势或季节变化。这一发现表明，钙化部位可能不受软体动物宿主和藻类共生体代谢活动产生的二氧化碳吸收和释放的影响。δ18O剖面显示出明显的季节性周期。在考虑了海水δ18O的影响后，时间序列变化与海面温度的变化一致，氧同位素分馏的温度依赖性与先前发表的生物和合成文石的δ18O–温度关系几乎相同。我们的结论是，该物种原始化石的δ18O记录将能够以高时间分辨率准确重建古环境。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Paleontological Research PALEONTOLOGY-

CiteScore

1.60

自引率

0.00%

发文量

审稿时长

>12 weeks

期刊介绍： Paleonotological Research (PR) is a quarterly, peer-reviewed international journal, which focuses on original contributions primarily in the area of paleontology but also covering a wide range of allied sciences. It has been published since 1997 as a successor to the former journal Transactions and Proceedings of the Palaeontological Society of Japan. The emphasis of contributions will include global and local perspectives, and contents can cover all ages (Precambrian to the Quaternary, including the present time).