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首页> 外文期刊>Proceedings of the National Academy of Sciences of the United States of America >Prolonged Permian-Triassic ecological crisis recorded by molluscan dominance in Late Permian offshore assemblages
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Prolonged Permian-Triassic ecological crisis recorded by molluscan dominance in Late Permian offshore assemblages

机译：软体动物在二叠纪近海组合中的优势地位记录了长期的二叠纪-三叠纪生态危机。

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The end-Permian mass extinction was the largest biotic crisis in the history of animal life, eliminating as many as 95% of all species and dramatically altering the ecological structure of marine communities. Although the causes of this pronounced ecosystem shift have been widely debated, the broad consensus based on inferences from global taxonomic diversity patterns suggests that the shift from abundant brachiopods to dominant molluscs was abrupt and largely driven by the catastrophic effects of the end-Permian mass extinction. Here we analyze relative abundance counts of > 33,000 fossil individuals from 24 silicified Middle and Late Permian paleocommunities,rndocumenting a substantial ecological shift to numerical dominance by molluscs in the Late Permian, before the major taxonomic shift at the end-Permian mass extinction. This ecological change was coincident with the development of fluctuating anoxic conditions in deep marine basins, suggesting that numerical dominance by more tolerant molluscs may have been driven by variably stressful environmental conditions. Recognition of substantial ecological deterioration in the Late Permian also implies that the end-Permian extinction was the climax of a protracted environmental crisis. Although the Late Permian shift to molluscan dominance was a pronounced ecological change, quantitative counts of 847 Carboniferous-Cretaceous collections from the Paleobiology Database indicate that it was only the first stage in a stepwise transition that culminated with the final shift to molluscan dominance in the Late Jurassic. Therefore, the ecological transition from brachiopods to bivalves was more protracted and complex than their simple Permian-Triassic switch in diversity.
机译：二叠纪末大规模灭绝是动物生命史上最大的生物危机，消除了多达95％的所有物种，并极大地改变了海洋社区的生态结构。尽管这种明显的生态系统转变的原因已经引起了广泛的争论，但基于全球生物分类多样性模式的推论，广泛的共识表明，从丰富的腕足类到优势软体动物的转变是突然的，并且很大程度上是由二叠纪末期生物灭绝的灾难性影响驱动的。在这里，我们分析了来自24个硅化的中，晚二叠纪古群落的33,000多名化石个体的相对丰度计数，表明在二叠纪末大灭绝之前的主要分类学转变之前，晚二叠纪的软体动物从生态学转向了数值优势。这种生态变化与深海海盆波动缺氧条件的发展相吻合，这表明更宽容的软体动物在数值上的主导地位可能是由压力条件变化引起的。认识到二叠纪末期的严重生态恶化，也意味着二叠纪末期的灭绝是旷日持久的环境危机的高潮。尽管晚二叠纪向软体动物主导地位转变是一个明显的生态变化，但对古生物学数据库中的847个石炭系-白垩纪集合的定量计数表明，这只是逐步过渡的第一步，而最终过渡到了后期软体动物地位。侏罗纪因此，从腕足动物到双壳类动物的生态过渡比它们简单的二叠纪-三叠纪生物多样性更持久和复杂。

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