Foraminifera grow in the ocean and when they die , mix with coral to become the sediment that forms atolls .
有孔虫生长在海洋里，它们死后与珊瑚混合，变成能够构成环状珊瑚的沉积物。
Stewart fallon of the australian national university in canberra and his colleagues collected samples from drill cores of the marine crust of tiny marine fossils called foraminifera .
Carbon dioxide and ice.researchers have measured the ratios of boron and calcium in planktonic foraminifera to calculate the levels of atmospheric carbon dioxide over the past 20 million years .
研究人员通过测量浮游有孔虫中硼与钙的比率来计算过去2000万年前大气二氧化碳含量。
No surprise there -- from coral to clams to microscopic foraminifera , shelled critters make their hard parts out of calcium carbonate ( caco3 ) .
There is evidence that the amount of carbonate in the shells of foraminifera , micro-plankton that are crucial to ocean ecology , has recently dropped by as much as a third .
