气候变化领域集成服务门户(CCPortal): pH and calcium change in the microenvironment of a benthic foraminifer (Ammonia sp.) and its size during experiments

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DOI	https://doi.org/10.1594/PANGAEA.808337
	pH and calcium change in the microenvironment of a benthic foraminifer (Ammonia sp.) and its size during experiments
	Glas; Martin S; Langer; Gerald; Keul; Nina
发布日期	2012-03-04
数据集类型	dataset
英文简介	Calcareous foraminifera are well known for their CaCO3 shells. Yet, CaCO3 precipitation acidifies the calcifying fluid. Calcification without pH regulation would therefore rapidly create a negative feedback for CaCO3 precipitation. In unicellular organisms, like foraminifera, an effective mechanism to counteract this acidification could be the externalization of H+ from the site of calcification. In this study we show that a benthic symbiont-free foraminifer Ammonia sp. actively decreases pH within its extracellular microenvironment only while precipitating calcite. During chamber formation events the strongest pH decreases occurred in the vicinity of a newly forming chamber (range of gradient about 100 µm) with a recorded minimum of 6.31 (< 10 µm from the shell) and a maximum duration of 7 h. The acidification was actively regulated by the foraminifera and correlated with shell diameters, indicating that the amount of protons removed during calcification is directly related to the volume of calcite precipitated. The here presented findings imply that H+ expulsion as a result of calcification may be a wider strategy for maintaining pH homeostasis in unicellular calcifying organisms.
语种	英语
国家	国际
学科大类	气候变化
学科子类	气候变化
文献类型	数据集
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/215539
推荐引用方式 GB/T 7714	Glas,Martin S,Langer,et al. pH and calcium change in the microenvironment of a benthic foraminifer (Ammonia sp.) and its size during experiments.2012-03-04.https://doi.org/10.1594/PANGAEA.808337.