华南地区早三叠世腕足类的残存演化模式

The Permian–Triassic mass extinction has resulted in the dramatic change of marine ecosystem. After the extinction event, the deteriorated environment lasted until the late Early Triassic, and thus resulted in the delayed recovery of the marine ecosystem in the Middle to Late Triassic. But marine ecosystem has not been always under the environmental pressure over the Early Triassic. Rather, repeated perturbations were recorded, and brought a fitful recovery of many organism during the Early Triassic, such as ammonids, conodonts, benthic foraminifers, calcareous algae and metazoan reefs. However, as one of the most typical survivors in the aftermath, brachiopod has attracted less attention on its surviving pattern. Moreover, brachiopod has been existed from the uppermost Permian to Lower Triassic strata, and thus provided vital material for studying the Lower Triassic strata with a scarcity of fossil record. Therefore, this project chose four Early Triassic brachiopod faunas , and planned to study their systematic taxonomy, analyze their morphospace and ecosystem structure changes and discuss brachiopod surviving pattern during the Early Triassic from different perspectives.

二叠–三叠纪生物灭绝事件导致海洋生态系统发生革命性的转变。灭绝事件之后，恶化的海洋环境一直持续到早三叠世晚期，导致海洋生态系统直到中晚三叠世才得到真正复苏和重建。但是，海洋生态系统并非在整个早三叠世一直受到环境恶化的压力，而是经历了若干短期的环境波动与缓和，因而导致不少生物门类在早三叠世就已经出现复苏的迹象，包括菊石、牙形石、底栖有孔虫类、钙藻和珊瑚类等。然而，腕足类作为灭绝事件之后最典型的残存生物之一，其在灭绝事件之后的残存演化模式却较少受到关注。而且腕足类从灭绝事件之前的二叠纪末期到早三叠世的地层中一直存在，实则为化石记录相对稀缺的下三叠统地层提供了绝好的研究材料。因此，本项目选取四个早三叠世的腕足动物群为研究载体，在传统分类学的基础上，利用数学统计的方法，分析早三叠世腕足类形态空间和生态结构的变化，从不同角度探讨腕足类在早三叠世的残存演化过程。

二叠–三叠纪生物灭绝事件导致海洋生态系统发生革命性的转变。灭绝事件之后，恶化的海洋环境一直持续到早三叠世晚期，导致海洋生态系统直到中晚三叠世才得到真正复苏和重建。但是，海洋生态系统并非在整个早三叠世一直受到环境恶化的压力，而是经历了若干短期的环境波动与缓和，因而导致不少生物门类在早三叠世就已经出现复苏的迹象，包括菊石、牙形石、底栖有孔虫类、钙藻和珊瑚类等。然而，腕足类作为灭绝事件之后最典型的残存生物之一，其在灭绝事件之后的残存演化模式却较少受到关注。而且腕足类从灭绝事件之前的二叠纪末期到早三叠世的地层中一直存在，实则为化石记录相对稀缺的下三叠统地层提供了绝好的研究材料。因此，本项目选取四个早三叠世的腕足动物群为研究载体，在传统分类学的基础上，利用数学统计的方法，分析早三叠世腕足类形态空间和生态结构的变化，从不同角度探讨腕足类在早三叠世的残存演化过程。