The End-Triassic mass extinction event [ETE] (201.5 Ma) marks a drastic turnover and loss of > 50% of marine biodiversity. Suggested environmental factors include extreme climate change and global carbon-cycle perturbations linked to Central Atlantic Magmatic Province (CAMP) volcanism. Considerable attention has been paid to disentangling the causes and selectivity of the ETE, whilst downplaying the patterns of change in the structure and functioning of marine paleofauna. Here we provide detailed quantitative information from across the Triassic-Jurassic boundary at Waterloo Bay, Larne, Northern Ireland, to describe patterns of changes in different palaeoecological parameters across the ETE. The analysis was based on abundance data of species sampled from approximately 1 m intervals through the sequence. Dominance and richness were estimated using rarefaction techniques and β-diversity index, and distinctness diversity indices were calculated. Changes in species composition were evaluated by multivariate analysis (nMDS, ANOMSIM and SIMPER). Rank abundance models were fitted, and functional diversity were estimated based on an ecospace model, applied to each sampled unit to detect changes in structure and ecological complexity. Across the ETE three distinctive states were identified: the pre-extinction state (Westbury Formation), characterised by an assemblage with high species richness and ecological redundancy, and with low taxonomic variation and functional diversity. The extinction state (Cotham and Langport members) represents a shift of the marine ecosystem, where > 70% marine species disappears decreasing the ecosystems functioning the marine ecosystem around 80%. The recovery state (Lias Group), commencing some ~ 150 ky after the extinction, with ecologically complex assemblages as new taxa colonised, increasing variation in taxonomic distinctness and new contributing ecological traits and functional richness through the Hettangian. The palaeoecological patterns described here are robust enough to discount possible facies effects, but more important, is consistent with other studies reported globally, and demonstrates that the ecological signals detected in this study are real.

三叠纪末大灭绝事件 [ETE] (201.5 Ma) 标志着 > 50% 的海洋生物多样性。建议的环境因素包括极端气候变化和与中大西洋岩浆区 (CAMP) 火山活动相关的全球碳循环扰动。人们相当重视解开 ETE 的成因和选择性，同时淡化海洋古动物结构和功能的变化模式。在这里，我们提供了来自北爱尔兰拉恩滑铁卢湾三叠纪-侏罗纪边界的详细定量信息，以描述整个 ETE 不同古生态参数的变化模式。该分析基于从大约 1 m 间隔通过序列采样的物种的丰度数据。使用稀疏技术和 β 多样性指数估计优势和丰富度，并计算差异性多样性指数。通过多变量分析（nMDS、ANOMSIM 和 SIMPER）评估物种组成的变化。拟合等级丰度模型，并基于生态空间模型估计功能多样性，应用于每个采样单元以检测结构和生态复杂性的变化。在整个 ETE 中确定了三个不同的状态：灭绝前状态（韦斯特伯里组），其特征是具有高物种丰富度和生态冗余的组合，以及低分类变异和功能多样性。灭绝状态（Cotham 和 Langport 成员）代表海洋生态系统的转变，其中 > 和功能多样性基于生态空间模型进行估计，应用于每个采样单元以检测结构和生态复杂性的变化。在整个 ETE 中确定了三个不同的状态：灭绝前状态（韦斯特伯里组），其特征是具有高物种丰富度和生态冗余的组合，以及低分类变异和功能多样性。灭绝状态（Cotham 和 Langport 成员）代表海洋生态系统的转变，其中 > 和功能多样性基于生态空间模型进行估计，应用于每个采样单元以检测结构和生态复杂性的变化。在整个 ETE 中确定了三个不同的状态：灭绝前状态（韦斯特伯里组），其特征是具有高物种丰富度和生态冗余的组合，以及低分类变异和功能多样性。灭绝状态（Cotham 和 Langport 成员）代表海洋生态系统的转变，其中 > 并且具有较低的分类变异和功能多样性。灭绝状态（Cotham 和 Langport 成员）代表海洋生态系统的转变，其中 > 并且具有较低的分类变异和功能多样性。灭绝状态（Cotham 和 Langport 成员）代表海洋生态系统的转变，其中 > 70% 的海洋物种消失，使海洋生态系统运作的生态系统减少了约 80%。恢复状态（Lias Group）， 在灭绝后约150 ky开始，随着新分类群的殖民，生态复杂的组合，通过 Hettangian 增加了分类学独特性和新的贡献生态特征和功能丰富性的变化。此处描述的古生态模式足够稳健，可以忽略可能的相影响，但更重要的是，与全球报告的其他研究一致，并表明本研究中检测到的生态信号是真实的。