Oxygen-dependent morphogenesis of modern clumped photosynthetic mats and implications for the archean stromatolite record

Min Sub Sim, Biqing Liang, Alexander P. Petroff, Alexander Evans, Vanja Klepac-Ceraj, David T. Flannery, Malcolm R. Walter, Tanja Bosak

研究成果: Article同行評審

36 引文 斯高帕斯(Scopus)

摘要

Some modern filamentous oxygenic photosynthetic bacteria (cyanobacteria) form macroscopic tufts, laminated cones and ridges that are very similar to some Archean and Proterozoic stromatolites. However, it remains unclear whether microbes that constructed Archean clumps, tufts, cones and ridges also produced oxygen. Here, we address this question by examining the physiology of cyanobacterial clumps, aggregates ~0.5 mm in diameter that initiate the growth of modern mm- and cm-scale cones. Clumps contain more particulate organic carbon in the form of denser, bowed and bent cyanobacterial filaments, abandoned sheaths and non-cyanobacterial cells relative to the surrounding areas. Increasing concentrations of oxygen in the solution enhance the bending of filaments and the persistence of clumps by reducing the lateral migration of filaments away from clumps. Clumped mats in oxic media also release less glycolate, a soluble photorespiration product, and retain a larger pool of carbon in the mat. Clumping thus benefits filamentous mat builders whose incorporation of inorganic carbon is sensitive to oxygen. The morphogenetic sequence of mm-scale clumps, reticulate ridges and conical stromatolites from the 2.7 Ga Tumbiana Formation likely records similar O2-dependent behaviors, preserving currently the oldest morphological signature of oxygenated environments on Early Earth.

原文English
頁(從 - 到)235-259
頁數25
期刊Geosciences (Switzerland)
2
發行號4
DOIs
出版狀態Published - 2012 12月

All Science Journal Classification (ASJC) codes

  • 一般地球與行星科學

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