Reduction in animal abundance and oxygen availability during and after the end‐Triassic mass extinction
Reduction in animal abundance and oxygen availability during and after the end‐Triassic mass extinction
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三叠纪大灭绝期间和之后动物数量和氧气供应量减少
DOI：
10.1111/gbi.12533
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发表时间：
2023
期刊：
影响因子：
3.7
通讯作者：
Payne, Jonathan L.
中科院分区：
文献类型：
--
作者：
Singh, Pulkit;Lu, Wanyi;Lu, Zunli;Jost, Adam B.;Lau, Kimberly;Bachan, Aviv;van de Schootbrugge, Bas;Payne, Jonathan L.
三叠纪末的生物多样性危机是动物生命史上最严重的大规模灭绝之一。然而，分类多样性的丧失与生物丰度的减少在多大程度上相结合，仍有待量化。此外，有机体丰度和当地海洋氧化还原条件之间的时间关系是缺乏碳酸盐岩部分。为了解决这些问题，我们测量了浅海石灰岩中的骨骼颗粒丰度，方法是对来自特提斯西部伦巴第盆地和亚平宁台地三叠纪/侏罗纪边界的四个地层剖面的293个薄剖面进行点计数。在所有地层剖面中，在三叠纪/侏罗纪边界上，Skeleton丰度突然下降。骨骼生物的丰度在整个下-中Hettangian地层中仍然很低，并在Hettangian晚期和Sinemurian早期开始反弹。双因素方差分析表明，样品年龄（p<0.01，η2= 0.30）比沉积环境或古水深（p<0.01，η2= 0.15）更能解释骨骼丰度的变化。测得的I/Ca比值是当地浅海氧化还原条件的代表，显示出相同的模式，最低的I/Ca比值发生在Hettangian早期。海洋水柱含氧量和骨骼丰度之间的密切对应关系表明，氧化还原条件和底栖生物丰度之间的连接跨越三叠纪/侏罗纪边界。这些发现表明，三叠纪末的大灭绝不仅减少了生物多样性，而且还减少了早期Hettangian生态系统中骨骼生物的承载能力，增加了物种大灭绝通常导致幸存者中的大规模稀有的证据。
The end‐Triassic biodiversity crisis was one of the most severe mass extinctions in the history of animal life. However, the extent to which the loss of taxonomic diversity was coupled with a reduction in organismal abundance remains to be quantified. Further, the temporal relationship between organismal abundance and local marine redox conditions is lacking in carbonate sections. To address these questions, we measured skeletal grain abundance in shallow‐marine limestones by point counting 293 thin sections from four stratigraphic sections across the Triassic/Jurassic boundary in the Lombardy Basin and Apennine Platform of western Tethys. Skeletal abundance decreased abruptly across the Triassic/Jurassic boundary in all stratigraphic sections. The abundance of skeletal organisms remained low throughout the lower‐middle Hettangian strata and began to rebound during the late Hettangian and early Sinemurian. A two‐way ANOVA indicates that sample age (p< .01,η2= 0.30) explains more of the variation in skeletal abundance than the depositional environment or paleobathymetry (p< .01,η2= 0.15). Measured I/Ca ratios, a proxy for local shallow‐marine redox conditions, show this same pattern with the lowest I/Ca ratios occurring in the early Hettangian. The close correspondence between oceanic water column oxygen levels and skeletal abundance indicates a connection between redox conditions and benthic organismal abundance across the Triassic/Jurassic boundary. These findings indicate that the end‐Triassic mass extinction reduced not only the biodiversity but also the carrying capacity for skeletal organisms in early Hettangian ecosystems, adding to evidence that mass extinction of species generally leads to mass rarity among survivors.
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影响因子：
5.8
作者：
Lu, Zunli;Jenkyns, Hugh C.;Rickaby, Rosalind E. M.
通讯作者：
Rickaby, Rosalind E. M.
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DOI：
--
发表时间：
2005
期刊：
影响因子：
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作者：
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影响因子：
4.6
作者：
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通讯作者：
J. Bailey
调查超大陆分裂的古生态后果：侏罗纪早期的海绵清理
DOI：
--
发表时间：
2015
期刊：
影响因子：
--
作者：
F. Corsetti;K. Ritterbush;D. Bottjer;S. Greene;Y. Ibarra;J. Yager;A. West;W. Berelson;S. Rosas;T. Becker;N. Levine;S. Loyd;R. Martindale;V. Petryshyn;Nathan R. Carroll;E. Petsios;C. Pietsch;J. Stellmann;J. Thompson;K. Washington;D. Wilmeth
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D. Wilmeth
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影响因子：
1.8
作者：
S. Todaro;P. Di Stefano;G. Zarcone;V. Randazzo
通讯作者：
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