Lipid biomarkers recording marine microbial community structure changes through the Frasnian‐Famennian mass extinction event
Lipid biomarkers recording marine microbial community structure changes through the Frasnian‐Famennian mass extinction event
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DOI：
10.1111/gbi.12568
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发表时间：
2023-07
期刊：
影响因子：
3.7
通讯作者：
Jian Chen;N. Hogancamp;Man Lu;T. Ikejiri;N. Malina;A. Ojeda;Yongge Sun;YueHan Lu
中科院分区：
文献类型：
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作者：
Jian Chen;N. Hogancamp;Man Lu;T. Ikejiri;N. Malina;A. Ojeda;Yongge Sun;YueHan Lu
研究大灭绝事件中海洋微生物群落的响应和恢复为了解海洋生态系统面对重大环境干扰的适应和恢复能力提供了一个进化窗口。本研究的目的是重建晚泥盆世弗拉斯纪-法门纪（F - F）过渡时期海洋微生物群落结构的变化。我们对伊利诺斯盆地（美国肯塔基州西部）上泥盆统新奥尔巴尼页岩的钻芯进行了多代理调查。芳基类异戊二烯在F - F区间表现出绿硫菌扩张和相关的光区氧化（PZE）增强。通过长链/短链正烷烃比值、碳偏好指数、C30多烷/C30藿烷和二藿烷指数的综合记录，这些变化可归因于陆源流入的增加。藿烷/甾烷比值表明，在大灭绝期间真核生物的产量明显高于原核生物。甾烷分布表明，微藻群落主要由绿藻支系组成，其优势地位在F - F区间变得更加明显，并在随后的时期继续上升。2α‐甲基藿烷指数值在大灭绝期间没有明显的变化，而3β‐甲基藿烷指数值在大灭绝期间记录了更多的甲烷营养细菌丰度，这表明由于氧气消耗加剧，甲烷循环增强。总体而言，在F - F灭绝期间，由于陆源流入加剧，伊利诺伊盆地的藻类产量增加，与当前正在经历全球化文化富营养化的当代沿海海洋相似。观测到的与F - F环境扰动相关的微生物群落变化在很大程度上局限于灭绝期，这表明晚泥盆世海洋微生物生态系统相对稳定，具有弹性。
Studying the response and recovery of marine microbial communities during mass extinction events provides an evolutionary window through which to understand the adaptation and resilience of the marine ecosystem in the face of significant environmental disturbances. The goal of this study is to reconstruct changes in the marine microbial community structure through the Late Devonian Frasnian‐Famennian (F‐F) transition. We performed a multiproxy investigation on a drill core of the Upper Devonian New Albany Shale from the Illinois Basin (western Kentucky, USA). Aryl isoprenoids show green sulfur bacteria expansion and associated photic zone euxinia (PZE) enhancement during the F‐F interval. These changes can be attributed to augmented terrigenous influxes, as recorded collectively by the long‐chain/short‐chain normal alkane ratio, carbon preference index, C30 moretane/C30 hopane, and diahopane index. Hopane/sterane ratios reveal a more pronounced dominance of eukaryotic over prokaryotic production during the mass extinction interval. Sterane distributions indicate that the microalgal community was primarily composed of green algae clades, and their dominance became more pronounced during the F‐F interval and continued to rise in the subsequent periods. The 2α‐methylhopane index values do not show an evident shift during the mass extinction interval, whereas the 3β‐methylhopane index values record a greater abundance of methanotrophic bacteria during the extinction interval, suggesting enhanced methane cycling due to intensified oxygen depletion. Overall, the Illinois Basin during the F‐F extinction experienced heightened algal productivity due to intensified terrigenous influxes, exhibiting similarities to contemporary coastal oceans that are currently undergoing globalized cultural eutrophication. The observed microbial community shifts associated with the F‐F environmental disturbances were largely restricted to the extinction interval, which suggests a relatively stable, resilient marine microbial ecosystem during the Late Devonian.