A diverse Ediacara assemblage survived under low-oxygen conditions.
A diverse Ediacara assemblage survived under low-oxygen conditions.
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DOI：
10.1038/s41467-022-35012-y
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发表时间：
2022-11-27
影响因子：
16.6
通讯作者：
Kaufman, Alan J.
中科院分区：
文献类型：
--
作者：
Cherry, Lucas B.;Gilleaudeau, Geoffrey J.;Grazhdankin, Dmitriy, V;Romaniello, Stephen J.;Martin, Aaron J.;Kaufman, Alan J.
埃迪卡拉生物群是软体生物，许多具有神秘的系统发育位置和生态，生活在5.74亿至5.39亿年前的海洋环境中。一些研究假设这些类群的后生动物亲和力和有氧代谢，而另一些则提出了一个根本上独立的分类分组和依赖化能自养。为了区分这些假设，并测试埃迪卡拉生物的氧化还原敏感性，在这里，我们提出了一个高分辨率的本地和全球的氧化还原数据集，从碳酸盐，包含在原地埃迪卡拉化石从西伯利亚。铈异常值始终大于1，表明当地环境普遍缺氧，在那里，一个多样化的埃迪卡拉纪组合作为结核和碳质挤压物原位保存。此外，δ 238 U值与其他埃迪卡拉纪末期的部分相匹配，表明海洋地黄广泛分布。这些数据表明，一些埃迪卡拉生物至少能耐受间歇性缺氧，因此有能力适应无氧生活方式。或者，这些软体埃迪卡拉生物可能在氧化还原代用数据未记录的短暂氧化事件期间定居海底。碳、硫和铀同位素之间的广泛时间相关性进一步突出了埃迪卡拉-寒武纪演化事件的动态氧化还原景观。来自西伯利亚沉积岩的地球化学数据表明，软体埃迪卡拉生物群（地球上最早的宏观生命）的成员能够耐受低氧条件，这表明它们具有厌氧代谢的能力。
The Ediacaran biota were soft-bodied organisms, many with enigmatic phylogenetic placement and ecology, living in marine environments between 574 and 539 million years ago. Some studies hypothesize a metazoan affinity and aerobic metabolism for these taxa, whereas others propose a fundamentally separate taxonomic grouping and a reliance on chemoautotrophy. To distinguish between these hypotheses and test the redox-sensitivity of Ediacaran organisms, here we present a high-resolution local and global redox dataset from carbonates that contain in situ Ediacaran fossils from Siberia. Cerium anomalies are consistently >1, indicating that local environments, where a diverse Ediacaran assemblage is preserved in situ as nodules and carbonaceous compressions, were pervasively anoxic. Additionally, δ238U values match other terminal Ediacaran sections, indicating widespread marine euxinia. These data suggest that some Ediacaran biotas were tolerant of at least intermittent anoxia, and thus had the capacity for a facultatively anaerobic lifestyle. Alternatively, these soft-bodied Ediacara organisms may have colonized the seafloor during brief oxygenation events not recorded by redox proxy data. Broad temporal correlations between carbon, sulfur, and uranium isotopes further highlight the dynamic redox landscape of Ediacaran-Cambrian evolutionary events. Geochemical data from sedimentary rocks in Siberia indicate that members of the soft-bodied Ediacara biota (the earliest macroscopic life on Earth) were tolerant of low-oxygen conditions, suggesting they had the capacity for anaerobic metabolisms.
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影响因子：
5.4
作者：
Bernhard JM;Morrison CR;Pape E;Beaudoin DJ;Todaro MA;Pachiadaki MG;Kormas KA;Edgcomb VP
通讯作者：
Edgcomb VP
影响因子：
5.4
作者：
Danovaro R;Dell'Anno A;Pusceddu A;Gambi C;Heiner I;Kristensen RM
通讯作者：
Kristensen RM
影响因子：
5.2
作者：
Cole, Devon B.;Planavsky, Noah J.;Sperling, Erik A.
通讯作者：
Sperling, Erik A.
影响因子：
3.9
作者：
Cui, Huan;Kaufman, Alan J.;Liu, Xiao-Ming
通讯作者：
Liu, Xiao-Ming
影响因子：
2.3
作者：
Cui, Huan;Xiao, Shuhai;Kaufman, Alan J.
通讯作者：
Kaufman, Alan J.