The role of biology in planetary evolution: cyanobacterial primary production in low-oxygen Proterozoic oceans.
The role of biology in planetary evolution: cyanobacterial primary production in low-oxygen Proterozoic oceans.
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DOI：
10.1111/1462-2920.13118
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发表时间：
2016-02
影响因子：
5.1
通讯作者：
Macalady JL
中科院分区：
文献类型：
--
作者：
Hamilton TL;Bryant DA;Macalady JL
对地球生物学家来说，了解生物学在行星进化中的作用仍然是一个突出的挑战。由于太古代（4.0 - 2.5 Gyr前）和元古代（2.5 - 0.5 Gyr前）时期保存完好的岩石的缺乏，阻碍了解开地球这个谜题的进程。此外，在地球生物群的大部分历史中占主导地位的微观生命留下了一个糟糕的化石记录，主要由石化的微生物席、罕见的微生物体化石和膜衍生的碳氢化合物分子组成，这些仍然具有挑战性。然而，从硫同位素记录和其他地球化学指标可以清楚地看出，在元古宙，氧气或氧化力的产生从根本上改变了地球表面和大气，使其远离了太古代时期普遍存在的更多还原条件。除了古代岩石之外，我们对地球氧化还原演化的重建还得益于我们对现存生物群催化的生物地球化学循环的了解。富氧光合作用在古代蓝藻中的出现代表了地球历史上最令人印象深刻的微生物创新之一，而富氧光合作用是当今大气中最大的o2来源。因此，微生物代谢和进化的研究提供了现存生物群与地质记录线索之间的重要联系。在这里，我们考虑了蓝藻（唯一能够进行含氧光合作用的微生物）的生理学，它们在各种环境中与无氧光养生物共存，以及它们在低氧环境中的持久性，包括水柱和地垫，贯穿了地球历史的大部分时间。我们研究了从岩石记录和目前生活在早期地球模拟生态系统中的蓝藻中获得的见解，并综合了这些古代微生物介质在行星氧化还原进化中的现有知识。我们的分析支持无氧光合作用的假设，包括代谢多样的蓝藻菌的活动，在元古代时期延缓地球表面海洋的氧合作用中发挥了重要作用。
Understanding the role of biology in planetary evolution remains an outstanding challenge to geobiologists. Progress towards unravelling this puzzle for Earth is hindered by the scarcity of well‐preserved rocks from the Archean (4.0 to 2.5 Gyr ago) and Proterozoic (2.5 to 0.5 Gyr ago) Eons. In addition, the microscopic life that dominated Earth's biota for most of its history left a poor fossil record, consisting primarily of lithified microbial mats, rare microbial body fossils and membrane‐derived hydrocarbon molecules that are still challenging to interpret. However, it is clear from the sulfur isotope record and other geochemical proxies that the production of oxygen or oxidizing power radically changed Earth's surface and atmosphere during the Proterozoic Eon, pushing it away from the more reducing conditions prevalent during the Archean. In addition to ancient rocks, our reconstruction of Earth's redox evolution is informed by our knowledge of biogeochemical cycles catalysed by extant biota. The emergence of oxygenic photosynthesis in ancient cyanobacteria represents one of the most impressive microbial innovations in Earth's history, and oxygenic photosynthesis is the largest source of O 2 in the atmosphere today. Thus the study of microbial metabolisms and evolution provides an important link between extant biota and the clues from the geologic record. Here, we consider the physiology of cyanobacteria (the only microorganisms capable of oxygenic photosynthesis), their co‐occurrence with anoxygenic phototrophs in a variety of environments and their persistence in low‐oxygen environments, including in water columns as well as mats, throughout much of Earth's history. We examine insights gained from both the rock record and cyanobacteria presently living in early Earth analogue ecosystems and synthesize current knowledge of these ancient microbial mediators in planetary redox evolution. Our analysis supports the hypothesis that anoxygenic photosynthesis, including the activity of metabolically versatile cyanobacteria, played an important role in delaying the oxygenation of Earth's surface ocean during the Proterozoic Eon.
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影响因子：
1.4
作者：
AWRAMIK, SM;SEMIKHATOV, MA
通讯作者：
SEMIKHATOV, MA
影响因子：
4.2
作者：
CASTENHOLZ, RW;BAULD, J;JORGENSON, BB
通讯作者：
JORGENSON, BB
影响因子：
5.2
作者：
Boyd ES;Fecteau KM;Havig JR;Shock EL;Peters JW
通讯作者：
Peters JW
影响因子：
64.8
作者：
Brocks, JJ;Love, GD;Bowden, SA
通讯作者：
Bowden, SA
影响因子：
5
作者：
Brocks, Jochen J.
通讯作者：
Brocks, Jochen J.