Effects of seawater pH and calcification rate on test Mg/Ca and Sr/Ca in cultured individuals of the benthic, calcitic foraminifera Elphidium williamsoni
Effects of seawater pH and calcification rate on test Mg/Ca and Sr/Ca in cultured individuals of the benthic, calcitic foraminifera Elphidium williamsoni
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DOI：
10.1016/j.chemgeo.2011.08.001
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发表时间：
2011-10-07
期刊：
影响因子：
3.9
通讯作者：
Paterson, D. M.
中科院分区：
文献类型：
--
作者：
Allison, N.;Austin, H.;Paterson, D. M.
我们培养的底栖，钙质有孔虫，Elphidium wilchosoni，在一系列的pH值（NIST）（7.89，8.15和8.30）为60天。二次离子质谱法用于测定培养体系中沉积的小室的Mg/Ca和Sr/Ca。Mg/Ca和Sr/Ca在单个测试室内以及在相同条件下培养的样本之间变化显著。我们通常没有观察到Mg/Ca和Sr/Ca之间的显着相关性，无论是在单一的测试或在相同的pH值培养的测试之间，我们得出结论，瑞利分馏，表示在方解石中的Sr和Mg之间的正相关性，是不是占主导地位的控制化学的测试。虽然测试形态，特别是小窝和脑桥外观，在相同的pH值培养的个体之间有很大的差异，我们认为没有简单的测试形态和地球化学之间的关系。平均测试Mg/Ca或Sr/Ca在治疗之间没有显著变化。在环境pH值（8.15）下培养的有孔虫中，在每次试验中沉积的方解石量与平均试验Sr/Ca和Mg/Ca之间未观察到显著相关性，表明钙化率对该有孔虫种属中的Sr和Mg试验化学没有显著影响。(C)2011 Elsevier B. V.保留所有权利。
We cultured the benthic, calcitic foraminifera, Elphidium williamsoni, over a range of pH(NIST) (7.89, 8.15 and 8.30) for 60 days. Secondary ion mass spectrometry was used to determine both the Mg/Ca and Sr/Ca of chambers deposited in the culture system. Both Mg/Ca and Sr/Ca vary significantly within individual test chambers and between specimens cultured under the same conditions. We do not typically observe significant correlations between Mg/Ca and Sr/Ca, either within single tests or between tests cultured at the same pH and we conclude that Rayleigh fractionation, indicated by a positive correlation between Sr and Mg in calcite, is not the predominant control on the chemistry of the tests. Although test morphology, particularly fossette and ponticuli appearance, varies substantially between individuals cultured at the same pH, we perceive no simple relationship between test morphology and geochemistry. Mean test Mg/Ca or Sr/Ca does not vary significantly between treatments. No significant correlation is observed between the amount of calcite deposited in each test and mean test Sr/Ca and Mg/Ca, in the foraminifera cultured at ambient pH (8.15), suggesting that calcification rate is not a significant influence on Sr and Mg test chemistry in this foraminifera species. (C) 2011 Elsevier B.V. All rights reserved.