期刊
SCIENCE
卷 303, 期 5655, 页码 207-210出版社
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1090592
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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 strati. cation in low latitudes, which was driven by polar cooling.
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