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Effect of different seawater Mg2+ concentrations on calcification in two benthic foraminifers

机译：不同海水mg 2 + 浓度对两种底栖有孔虫钙化的影响

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Magnesium, incorporated in foraminiferal calcite (Mg/CaCC), is used intensively to reconstruct past seawater temperatures but, in addition to temperature, the Mg/CaCC of foraminiferal tests also depends on the ratio of Mg and Ca in seawater (Mg/CaSW). The physiological mechanisms responsible for these proxy relationships are still unknown. This culture study investigates the impact of different seawater [Mg2 +] on calcification in two benthic foraminiferal species precipitating contrasting Mg/CaCC: Ammonia aomoriensis, producing low-Mg calcite and Amphistegina lessonii, producing intermediate-Mg calcite. Foraminiferal growth and test thickness were determined and, Mg/Ca was analyzed using Laser Ablation-Inductively Coupled Plasma-Mass Spectrometry (LA-ICP-MS). Results show that at present-day seawater Mg/CaSW of ~ 5, both species have highest growth rates, reflecting their adaptation to modern seawater element concentrations. Test thickness is not significantly affected by different Mg/CaSW. The relationship between Mg/CaSW and Mg/CaCC shows a distinct positive y-axis intercept, possibly reflecting at least two processes involved in foraminiferal biomineralization. The associated Mg partition (DMg) changes non-linearly with increasing Mg/CaSW, hence suggesting that the DMg is best described by an exponential function approaching an asymptote
机译：掺入有孔虫方解石（Mg / CaCC）中的镁被大量用于重建过去的海水温度，但除温度外，有孔虫试验的Mg / CaCC还取决于海水中Mg和Ca的比例（Mg / CaSW） 。负责这些代理关系的生理机制仍是未知的。这项文化研究调查了不同海水[Mg2 +]对两种底栖有孔虫物种钙化的影响，这两种底栖有孔虫物种与Mg / CaCC形成对比：产生低Mg方解石的Aomoriensis氨水和产生中等Mg方解石的Amphistegina lessonii。确定有孔虫的生长和测试厚度，并使用激光烧蚀-电感耦合等离子体质谱法（LA-ICP-MS）分析Mg / Ca。结果表明，目前的海水Mg / CaSW约为5，这两个物种的增长率最高，反映了它们对现代海水元素浓度的适应性。不同的Mg / CaSW不会显着影响测试厚度。 Mg / CaSW和Mg / CaCC之间的关系显示出明显的y轴正向截距，可能反映了有孔虫生物矿化中涉及的至少两个过程。关联的Mg分区（DMg）随着Mg / CaSW的增加而非线性变化，因此表明DMg最好通过接近渐近线的指数函数来描述

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