Schmidt Daniela N, Thierstein Hans R, Bollmann Jörg, Schiebel Ralf
Department of Earth Sciences, Eidgenössische Technische Hochschule (ETH) Zürich, and University of Zürich, ETH-Zentrum, CH-8092 Zürich, Switzerland.
Science. 2004 Jan 9;303(5655):207-10. doi: 10.1126/science.1090592.
We characterize the evolutionary radiation of planktic foraminifera by the test size distributions of entire assemblages in more than 500 Cenozoic marine sediment samples, including more than 1 million tests. Calibration of Holocene size patterns with environmental parameters and comparisons with Cenozoic paleoproxy data show a consistently positive correlation between test size and surface-water stratification intensity. We infer that the observed macroevolutionary increase in test size of planktic foraminifera through the Cenozoic was an adaptive response to intensifying surface-water stratification in low latitudes, which was driven by polar cooling.
我们通过对500多个新生代海洋沉积物样本中整个组合的测试大小分布进行分析，这些样本包含超过100万个测试，以此来描述浮游有孔虫的进化辐射。通过将全新世大小模式与环境参数进行校准，并与新生代古代理数据进行比较，结果表明测试大小与地表水层化强度之间始终存在正相关关系。我们推断，在新生代期间观察到的浮游有孔虫测试大小的宏观进化增加是对低纬度地区地表水层化加剧的一种适应性反应，而这种加剧是由极地冷却驱动的。
