Molecular fossils of diatoms: Applications in petroleum geochemistry and palaeoenvironmental studies
Diatoms are one of the major groups of algae which originated relatively recently and evolved in the Late Jurassic/Cretaceous. This thesis presents the results of a comprehensive study of diatom lipids in cultures and in the environment and their applications in the age determination of petroleum an...
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Utrecht University
2009
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ftunivutrecht:oai:dspace.library.uu.nl:1874/315072 2023-07-23T04:13:59+02:00 Molecular fossils of diatoms: Applications in petroleum geochemistry and palaeoenvironmental studies Rampen, S.W. Dep Aardwetenschappen Organic geochemistry & molecular biogeology Sinninghe Damsté, J. S. Schouten, Stefan 2009-06-11 image/pdf https://dspace.library.uu.nl/handle/1874/315072 en eng Utrecht University https://dspace.library.uu.nl/handle/1874/315072 info:eu-repo/semantics/OpenAccess Diatoms Biomarkers Sterols Long-chain diols Palaeoenvironmental studies Petroleum studies Phylogeny Dissertation 2009 ftunivutrecht 2023-07-02T01:24:27Z Diatoms are one of the major groups of algae which originated relatively recently and evolved in the Late Jurassic/Cretaceous. This thesis presents the results of a comprehensive study of diatom lipids in cultures and in the environment and their applications in the age determination of petroleum and in palaeoenvironmental studies. Diatom DNA sequences were analyzed in order to relate the phylogenetic positions of diatoms to the lipid chemotaxonomy. Forty four different sterols were identified in diatoms, with 24-methylcholesta-5,24(28)-dien-3-beta-ol being most common. 24-Methylcholesta-5,22E-dien-3-beta-ol, previously described as a diatom biomarker, was only the fifth most common sterol and absent in some major diatom groups. All identified sterols have been reported in other algae, but within the diatoms, some sterols and sterol compositions seem to be specific for specific phylogenetic clusters. Sterol compositions confirmed the separate phylogenetic position of the genus Attheya, as also indicated by molecular phylogeny and microscopy. 23-Methyl and 23,24-dimethyl sterols, often associated with dinoflagellate algae, were present in a substantial number of diatoms, suggesting that diatoms may also be a major source. Their phylogenetic position suggests that these diatoms originated from a single common ancestor which evolved in the late Jurassic. In addition to 23-methyl and 23,24-dimethyl sterols, the unusual sterol gorgosterol was found in two diatom cultures of the genus Delphineis. 24-Norsterols were found in the diatom species Thalassiosira aff. antarctica and in dinoflagellate cultures. The evolutionary history of dinoflagellates and diatoms explains the stepwise increases of 24-norsterane concentrations, diagenetic products of 24-norsterols, in petroleum. Long-chain 1,14-diols and 12-hydroxy methyl alkanoates were detected in Proboscia diatoms and may be used as indicators for high-nutrient conditions and upwelling. Their distributions varied between different Proboscia species and culture ... Doctoral or Postdoctoral Thesis Antarc* Antarctica Utrecht University Repository |
institution |
Open Polar |
collection |
Utrecht University Repository |
op_collection_id |
ftunivutrecht |
language |
English |
topic |
Diatoms Biomarkers Sterols Long-chain diols Palaeoenvironmental studies Petroleum studies Phylogeny |
spellingShingle |
Diatoms Biomarkers Sterols Long-chain diols Palaeoenvironmental studies Petroleum studies Phylogeny Rampen, S.W. Molecular fossils of diatoms: Applications in petroleum geochemistry and palaeoenvironmental studies |
topic_facet |
Diatoms Biomarkers Sterols Long-chain diols Palaeoenvironmental studies Petroleum studies Phylogeny |
description |
Diatoms are one of the major groups of algae which originated relatively recently and evolved in the Late Jurassic/Cretaceous. This thesis presents the results of a comprehensive study of diatom lipids in cultures and in the environment and their applications in the age determination of petroleum and in palaeoenvironmental studies. Diatom DNA sequences were analyzed in order to relate the phylogenetic positions of diatoms to the lipid chemotaxonomy. Forty four different sterols were identified in diatoms, with 24-methylcholesta-5,24(28)-dien-3-beta-ol being most common. 24-Methylcholesta-5,22E-dien-3-beta-ol, previously described as a diatom biomarker, was only the fifth most common sterol and absent in some major diatom groups. All identified sterols have been reported in other algae, but within the diatoms, some sterols and sterol compositions seem to be specific for specific phylogenetic clusters. Sterol compositions confirmed the separate phylogenetic position of the genus Attheya, as also indicated by molecular phylogeny and microscopy. 23-Methyl and 23,24-dimethyl sterols, often associated with dinoflagellate algae, were present in a substantial number of diatoms, suggesting that diatoms may also be a major source. Their phylogenetic position suggests that these diatoms originated from a single common ancestor which evolved in the late Jurassic. In addition to 23-methyl and 23,24-dimethyl sterols, the unusual sterol gorgosterol was found in two diatom cultures of the genus Delphineis. 24-Norsterols were found in the diatom species Thalassiosira aff. antarctica and in dinoflagellate cultures. The evolutionary history of dinoflagellates and diatoms explains the stepwise increases of 24-norsterane concentrations, diagenetic products of 24-norsterols, in petroleum. Long-chain 1,14-diols and 12-hydroxy methyl alkanoates were detected in Proboscia diatoms and may be used as indicators for high-nutrient conditions and upwelling. Their distributions varied between different Proboscia species and culture ... |
author2 |
Dep Aardwetenschappen Organic geochemistry & molecular biogeology Sinninghe Damsté, J. S. Schouten, Stefan |
format |
Doctoral or Postdoctoral Thesis |
author |
Rampen, S.W. |
author_facet |
Rampen, S.W. |
author_sort |
Rampen, S.W. |
title |
Molecular fossils of diatoms: Applications in petroleum geochemistry and palaeoenvironmental studies |
title_short |
Molecular fossils of diatoms: Applications in petroleum geochemistry and palaeoenvironmental studies |
title_full |
Molecular fossils of diatoms: Applications in petroleum geochemistry and palaeoenvironmental studies |
title_fullStr |
Molecular fossils of diatoms: Applications in petroleum geochemistry and palaeoenvironmental studies |
title_full_unstemmed |
Molecular fossils of diatoms: Applications in petroleum geochemistry and palaeoenvironmental studies |
title_sort |
molecular fossils of diatoms: applications in petroleum geochemistry and palaeoenvironmental studies |
publisher |
Utrecht University |
publishDate |
2009 |
url |
https://dspace.library.uu.nl/handle/1874/315072 |
genre |
Antarc* Antarctica |
genre_facet |
Antarc* Antarctica |
op_relation |
https://dspace.library.uu.nl/handle/1874/315072 |
op_rights |
info:eu-repo/semantics/OpenAccess |
_version_ |
1772182466562359296 |