A Biofilm Channel Origin for Vermiform Microstructure in Carbonate Microbialites

IF 2.7 2区 地球科学 Q2 BIOLOGY Geobiology Pub Date : 2024-10-17 DOI:10.1111/gbi.12623
Yadira Ibarra, Pedro J. Marenco, Jakob P. Centlivre, Brian P. Hedlund, Laura K. Rademacher, Sarah E. Greene, David J. Bottjer, Frank A. Corsetti
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Abstract

A three-dimensional tubular fabric known as “vermiform microstructure” in Phanerozoic and Neoproterozoic carbonate microbialites has been hypothesized to represent the body fossil of nonspicular keratose demosponges. If correct, this interpretation extends the sponge body fossil record and origin of animals to ~890 Ma. However, the veracity of the keratose sponge interpretation for vermiform microstructure remains in question, and the origin of the tubular fabric is enigmatic. Here we compare exceptionally well-preserved microbialite textures from the Upper Triassic to channel networks created by modern microbial biofilms. We demonstrate that anastomosing channel networks of similar size and geometries are produced by microbial biofilms in the absence of sponges, suggesting the origin for vermiform microstructure in ancient carbonates is not unique to sponges and perhaps best interpreted conservatively as likely microbial in origin. We present a taphonomic model of early biofilm lithification in seawater with anomalously high carbonate saturation necessary to preserve delicate microbial textures. This work has implications for the understanding of three-dimensional biofilm architecture that goes beyond the current micro-scale observations available from living biofilm experiments and suggests that biofilm channel networks have an extensive fossil record.

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碳酸盐微生物岩中蛭石状微结构的生物膜通道起源
据推测,新生代和新元古代碳酸盐微生物岩中的一种被称为 "蛭形微结构 "的三维管状结构代表了无棘皮角质底栖海绵的身体化石。如果这一解释是正确的,那么海绵的身体化石记录和动物起源将延伸到大约 890 Ma。然而,角质海绵对疣状微结构的解释的真实性仍然存在疑问,管状结构的起源也是一个谜。在这里,我们将上三叠世保存完好的微生物岩纹理与现代微生物生物膜形成的通道网络进行了比较。我们证明,在没有海绵的情况下,微生物生物膜也能产生类似大小和几何形状的吻合通道网络,这表明古代碳酸盐岩中蚯蚓状微结构的起源并非海绵所独有,也许最好保守地解释为可能起源于微生物。我们提出了一个海水中早期生物膜岩化的岩石学模型,海水中异常高的碳酸盐饱和度是保存微妙的微生物纹理所必需的。这项工作对理解三维生物膜结构具有重要意义,它超越了目前从活体生物膜实验中获得的微观尺度观测结果,并表明生物膜通道网络具有广泛的化石记录。
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来源期刊
Geobiology
Geobiology 生物-地球科学综合
CiteScore
6.80
自引率
5.40%
发文量
56
审稿时长
3 months
期刊介绍: The field of geobiology explores the relationship between life and the Earth''s physical and chemical environment. Geobiology, launched in 2003, aims to provide a natural home for geobiological research, allowing the cross-fertilization of critical ideas, and promoting cooperation and advancement in this emerging field. We also aim to provide you with a forum for the rapid publication of your results in an international journal of high standing. We are particularly interested in papers crossing disciplines and containing both geological and biological elements, emphasizing the co-evolutionary interactions between life and its physical environment over geological time. Geobiology invites submission of high-quality articles in the following areas: Origins and evolution of life Co-evolution of the atmosphere, hydrosphere and biosphere The sedimentary rock record and geobiology of critical intervals Paleobiology and evolutionary ecology Biogeochemistry and global elemental cycles Microbe-mineral interactions Biomarkers Molecular ecology and phylogenetics.
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Redox Gradient Shapes the Chemical Composition of Peatland Microbial Communities Ultrastructural Perspectives on the Biology and Taphonomy of Tonian Microfossils From the Draken Formation, Spitsbergen Issue Information Featured Cover A Biofilm Channel Origin for Vermiform Microstructure in Carbonate Microbialites
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