Complex lipids in microbial mats and stromatolites of Hamelin Pool, Shark Bay, Australia
Thesis: S.M., Massachusetts Institute of Technology, Department of Earth, Atmospheric, and Planetary Sciences, 2014.
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| Format: | Thesis |
| Language: | eng |
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Massachusetts Institute of Technology
2015
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| Online Access: | http://hdl.handle.net/1721.1/95566 |
| _version_ | 1826216179276972032 |
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| author | Myers, Elise McKenna |
| author2 | Roger Summons. |
| author_facet | Roger Summons. Myers, Elise McKenna |
| author_sort | Myers, Elise McKenna |
| collection | MIT |
| description | Thesis: S.M., Massachusetts Institute of Technology, Department of Earth, Atmospheric, and Planetary Sciences, 2014. |
| first_indexed | 2024-09-23T16:43:32Z |
| format | Thesis |
| id | mit-1721.1/95566 |
| institution | Massachusetts Institute of Technology |
| language | eng |
| last_indexed | 2024-09-23T16:43:32Z |
| publishDate | 2015 |
| publisher | Massachusetts Institute of Technology |
| record_format | dspace |
| spelling | mit-1721.1/955662019-04-10T12:30:23Z Complex lipids in microbial mats and stromatolites of Hamelin Pool, Shark Bay, Australia Myers, Elise McKenna Roger Summons. Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences. Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences. Earth, Atmospheric, and Planetary Sciences. Thesis: S.M., Massachusetts Institute of Technology, Department of Earth, Atmospheric, and Planetary Sciences, 2014. Cataloged from PDF version of thesis. Includes bibliographical references (pages 50-56). Stromatolites, columnar rock-like structures, are potentially some of the oldest, microbially mediated fossils visible in the rock record; if biogenesis is able to be confirmed for these ancient stromatolites, some being greater than 3 billion years old, these ancient stromatolites could be used to demonstrate the microbial community assemblages throughout ancient time. Hamelin Pool, Shark Bay, Australia is an ideal field site for this task, as stromtolites and modem microbial mats coexist and the microbial mats have been shown to contribute to the formation of the stromatolites. Comprehensive lipid biomarker profiles were determined in this study for non-lithified smooth, pustular, and colloform microbial mats, as well as for smooth and colloform stromatolites. Intact polar lipids, glycerol dialkyl glycerol tetraethers, and bacteriohopanepolyols were analyzed via liquid chromatography-mass spectrometry (LC-MS) coupled to a Quadropole Time-of-Flight (QTOF) mass spectrometer, while the previously studied fatty acids (Allen et al., 2010) were analyzed using gas chromatography-mass spectrometry (GC-MS) to prove consistent signatures. From the lipid profiles, sulfate-reducing bacteria and anoxygenic phototrophic bacteria and archaea could be inferred. The presence of the rare 3- methylhopanoids (3 Me-BHPs) was discovered in a significant portion of the samples, which could add to the characterization of this molecule, which has only been concretely linked to oxygenic conditions for formation. In accordance with Allen et al. in 2010, 2- methyhopanoids were detected, as well as limited signals from higher (vascular) plants. While the lipid profiles for all sediment types were similar, there were some differences that are likely attributable to morphological differences. However, the overall similarities suggest microbial communities can be similar between non-lithified microbial mats and stromatolites. 2 by Elise McKenna Myers. S.M. 2015-02-25T17:10:32Z 2015-02-25T17:10:32Z 2014 2014 Thesis http://hdl.handle.net/1721.1/95566 903537423 eng M.I.T. theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission. See provided URL for inquiries about permission. http://dspace.mit.edu/handle/1721.1/7582 62 pages application/pdf u-at-we Massachusetts Institute of Technology |
| spellingShingle | Earth, Atmospheric, and Planetary Sciences. Myers, Elise McKenna Complex lipids in microbial mats and stromatolites of Hamelin Pool, Shark Bay, Australia |
| title | Complex lipids in microbial mats and stromatolites of Hamelin Pool, Shark Bay, Australia |
| title_full | Complex lipids in microbial mats and stromatolites of Hamelin Pool, Shark Bay, Australia |
| title_fullStr | Complex lipids in microbial mats and stromatolites of Hamelin Pool, Shark Bay, Australia |
| title_full_unstemmed | Complex lipids in microbial mats and stromatolites of Hamelin Pool, Shark Bay, Australia |
| title_short | Complex lipids in microbial mats and stromatolites of Hamelin Pool, Shark Bay, Australia |
| title_sort | complex lipids in microbial mats and stromatolites of hamelin pool shark bay australia |
| topic | Earth, Atmospheric, and Planetary Sciences. |
| url | http://hdl.handle.net/1721.1/95566 |
| work_keys_str_mv | AT myerselisemckenna complexlipidsinmicrobialmatsandstromatolitesofhamelinpoolsharkbayaustralia |