The role of regional survivor incumbency in the evolutionary recovery of calcareous nannoplankton from the Cretaceous/Paleogene (K/Pg) mass extinction

The earliest Paleocene record of calcareous nannoplankton presents a unique opportunity to understand the evolutionary recovery of life from mass extinction. Nannoplankton were devastated at the Cretaceous/Paleogene boundary and their subsequent recovery can be studied in great detail because of their abundance in sediments, continuous stratigraphic occurrence, and near global distribution. Here we determine when and where new species of nannoplankton originated and how they dispersed following the Cretaceous/Paleogene mass extinction. Initially, we focus our efforts on North Pacific and South Atlantic deep sea sites with orbital age control to compare the precise timing and dynamics of the recovery between the locations. We then broaden our investigation to six sites from different basins and a variety of environments to study global patterns of the initial recovery. Our results show that many taxa in key Paleogene lineages originated in the North Pacific Ocean and that assemblages com...

钙质超微浮游生物（calcareous nannoplankton）的最早古新世记录，为探究生物大灭绝后的演化复苏提供了独特契机。钙质超微浮游生物在白垩纪/古近纪（Cretaceous/Paleogene）边界事件中遭受重创，由于其在沉积物中丰度可观、地层产出连续且近乎全球分布，其后续复苏过程可被细致研究。本研究旨在明确白垩纪/古近纪大灭绝后，钙质超微浮游生物新物种的起源时间与起源地点，及其扩散模式。研究首先聚焦于具备轨道年代控制数据的北太平洋与南大西洋深海沉积位点，以对比两处位点复苏过程的精确时序与动力学特征。随后，我们将研究范围拓展至来自不同盆地与多种环境的6个沉积位点，以探究复苏初期的全球分布模式。本研究结果显示，古近纪关键演化支系中的多个分类群起源于北太平洋，且其生物组合……