Causes of the last global deep-sea extinction from the analyses of foraminiferal tests

我分析了在中更新世过渡时期，特定底栖有孔虫最后一次全球深海灭绝的原因。根据它们的内测形态，发现它们与其他底栖有孔虫有微弱的系统发育关系，在内测中显示出相似的结构。在已灭绝有孔虫的实验中发现了光学颗粒结构，提示了它们的深层动物微栖息地。最后一次全球深海物种灭绝可能发生在中更新世期间，与深水冷却和深海氧化环境的增加有关。

I analysed the causes of the last global deep-sea extinction of the particular benthic foraminifera during the mid-Pleistocene Transition. On the basis of their internal test morphology, they were found to have weak phylogenic relationship among other benthic foraminifera that shows similar structure inside the test. Optically granular structure were found in the test of extinct foraminifera and suggested their deep infaunal microhabitat. The last global deep-sea extinction was implied that it might have occurred in associated with cooling deep-water and becoming more oxidised environments at deep-sea during the middle Pleistocene.