计算模拟方法提高深时食物网稳定性演变的时间分辨率: 以煤山剖面二叠纪‒三叠纪生态记录为例

作者：Huang Yuangeng, Xin Bailun, Guo Zhen, Ziheng Li, Huijie Qiao, Xinyue Huang, Zhong-Qiang Chen · 发表于：Earth Science-Journal of China University of Geosciences · 年份：2025 · DOI：10.3799/dqkx.2025.022 · 研究领域：Military Technology and Strategies、Legal and Regulatory Analysis、Linguistic, Cultural, and Literary Studies

The Permian-Triassic (P-Tr) mass extinction, which occurred approximately 252 million years ago, represents the largest ecological crisis in Earth′s geological history and is often regarded as a reference case for modern ecological crises.However, studies that integrate multiple taxa and systematically characterize the overall evolutionary trajectory of food web structures in communities remain scarce.In particular, the incompleteness of fossil records and their low temporal resolution within stratigraphic records pose significant challenges to using deep-time crises as analogs for modern ecological crises.This study focuses on the fossil-rich Meishan Section in Zhejiang Province, the global stratotype section and point (GSSP) for the P-Tr boundary.Using Bayesian modeling with the PyRate method, we recalculated the true first and last appearances of all fossil species within this section.The results reveal a three-phase decline in species diversity: rapid drops in the first and third phases, with a gradual decline in the second phase.Building on these results, we explored schemes for delineating paleocommunities at varying temporal resolutions, ranging from 50 ka per community down to 1 ka per community.We then analyzed species composition similarity between adjacent communities under each scheme.As the temporal resolution increases, adjacent communities exhibit increasingly similar species compositions.Notably, for resolutions of 1-4 ka years per community, over 5% of adjace...