Amphistegina are common larger benthic foraminifer in coral reefs, with a nearly circumtropical distribution, and are major contributors to the CaCO₃ budget of shallow marine environments. The family Amphisteginidae is dominant in Cenozoic carbonates. However, its potential as a proxy for paleoclimate reconstruction has not been completely explored. The intratest variability in trace elements of Amphistegina lessonii has been investigated using femtosecond‐laser ablation‐inductively coupled plasma‐mass spectrometry (fs‐LA‐ICP‐MS). We collected and analyzed adult specimens of A. lessonii in September 2003, November 2003, January 2004, and March 2004, from ∼2 m water depth in the coral reefs of Akajima, Okinawa, Japan. Tests of A. lessonii from these four collections were analyzed for Mg/Ca of the septa to observe Test Size‐Lifespan relationships. The lifespan of a specimen of A. lessonii of 1,200 µm in diameter is estimated at ∼3 and ∼2 months for specimens 900 µm in size. Over the estimated lifespans, Mg/Ca of individual specimens of A. lessonii is highly variable and displays co‐variation with temperature and tidal heights. Future projects may apply and further test this approach for the reconstruction of the tropical shallow marine paleoenvironments.

中文翻译：

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飞秒激光烧蚀-ICP-质谱联用技术对小圆石楠微量元素组成的测试内变化：来自日本冲绳县赤岛的田间研究

两栖动物是珊瑚礁中常见的大型底栖有孔虫，具有近乎环境分布，并且是浅海环境中CaCO ₃预算的主要贡献者。Amphisteginidae科在新生代碳酸盐中占主导地位。但是，尚未完全探索其作为古气候重建代理的潜力。使用飞秒激光消融-电感耦合等离子体质谱法（fs-LA-ICP-MS）研究了两性鞭毛虫微量元素的测试内变异性。我们在2003年9月，2003年11月，2004年1月和2004年3月从日本冲绳赤岛的珊瑚礁中约2 m水深处收集并分析了A. lessonii的成年标本。测试分析来自这四个集合的A. lessonii的隔片的Mg / Ca，以观察测试尺寸与寿命的关系。对于直径为900 µm的标本，直径为1,200 µm的A. lessonii标本的估计寿命约为3个月至2个月。在估计的寿命中，A。lessonii的各个标本的Mg / Ca高度可变，并且显示出随温度和潮高的变化。未来的项目可能会应用并进一步测试这种方法来重建热带浅海古环境。