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

从有孔虫试验分析上次全球深海灭绝的原因

• 批准号: 19740317
• 负责人: KAWAGATA Shungo
• 金额: $ 2.32万
• 依托单位: Yokohama National University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Young Scientists (B)
• 财政年份: 2007
• 资助国家: 日本
• 起止时间: 2007 至 2009
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-19740317/
• 关键词: 深海生有孔虫; 古生態; 絶滅; 古海洋; 環境変動

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.

我分析了更新世中期过渡期间特定底栖有孔虫的最后一次全球深海灭绝的原因。根据其内部测试形态，发现它们与其他底栖有孔虫之间具有较弱的系统发育关系，在测试中显示出相似的结构。在对灭绝的有孔虫的测试中发现了光学颗粒结构，并暗示了它们的深层动物微生境。最近一次全球深海灭绝表明，它可能与更新世中期深海冷却和深海氧化程度更高有关。