Morphological record of oxygenic photosynthesis in conical stromatolites
Conical stromatolites are thought to be robust indicators of the presence of photosynthetic and phototactic microbes in aquatic environments as early as 3.5 billion years ago. However, phototaxis alone cannot explain the ubiquity of disrupted, curled, and contorted laminae in the crests of many Meso...
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| Veröffentlicht in: | Proceedings of the National Academy of Sciences - PNAS 2009-07, Vol.106 (27), p.10939-10943 |
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| creator | Bosak, Tanja Liang, Biqing Sim, Min Sub Petroff, Alexander P |
| description | Conical stromatolites are thought to be robust indicators of the presence of photosynthetic and phototactic microbes in aquatic environments as early as 3.5 billion years ago. However, phototaxis alone cannot explain the ubiquity of disrupted, curled, and contorted laminae in the crests of many Mesoproterozoic, Paleoproterozoic, and some Archean conical stromatolites. Here, we demonstrate that cyanobacterial production of oxygen in the tips of modern conical aggregates creates contorted laminae and submillimeter-to-millimeter-scale enmeshed bubbles. Similarly sized fossil bubbles and contorted laminae may be present only in the crestal zones of some conical stromatolites 2.7 billion years old or younger. This implies not only that cyanobacteria built Proterozoic conical stromatolites but also that fossil bubbles may constrain the timing of the evolution of oxygenic photosynthesis. |
| doi_str_mv | 10.1073/pnas.0900885106 |
| format | Article |
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| subjects | Aquatic ecosystems Archaea - metabolism Bacteria Biofilms Biological Sciences Bubbles Carbonates Cyanobacteria Fossils Geologic Sediments - microbiology Molecular evolution Morphology Oxygen Oxygen - metabolism Photosynthesis Physical Sciences Sediments Stromatolites |
| title | Morphological record of oxygenic photosynthesis in conical stromatolites |
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