Isolation and Cultivation of the Source Organisms of Long-chain Diol lipids from Marine Environments to test their Application in Palaeoclimate Studies
Microbial Ecology and Applied Microbiology
Palaeontology
Final Report Abstract
The results from this study show that long chain 1,13- and 1,15-diols are produced by a novel group of eustigmatophyte algae which evolved before the currently known species of this group diversified. The long chain 1,13- and 1,15-diols are primarily produced under warm and calm conditions. As a result, we can constrain the Long chain Diol Index, the LDI, as a proxy for temperatures of the warmest months. With this knowledge, we obtained an improved calibration for the LDI, and we demonstrated that the LDI provides highly valuable information that is complementary to the currently used temperature proxies. Given the ubiquitous occurrence of long chain diols in ancient marine sediments, the outcome of this project can have a significant contribution to our understanding of past climate conditions.
Publications
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2019. Constraining the applicability of organic paleotemperature proxies for the last 90 Myrs. Organic Geochemistry 128, 122-136
De Bar, M.W., Rampen, S.W., Hopmans, E.C., Sinninghe Damsté, J.S., Schouten, S.
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2020. Global temperature calibration of the Long chain Diol Index in marine surface sediments. Organic Geochemistry 142, 103983
De Bar, M.W., Weiss, G., Yildiz, C., Rampen, S.W., Lattaud, J., Bale, N.J., Mienis, F., Brummer, G.- J.A., Schulz, H., Rush, D., Kim, J.-H., Donner, B., Knies, J., Lückge, A., Stuut, J.-B.W., Sinninghe Damsté, J.S., Schouten, S.
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2020. Sterol preservation in hypersaline microbial mats. Biogeosciences 17, 649-666
Shen, Y., Thiel, V., Suarez-Gonzalez, P., Rampen, S.W., Reitner, J.
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2022. The Long chain Diol Index: A marine palaeotemperature proxy based on eustigmatophyte lipids that records the warmest seasons. Proceedings of the National Academy of Sciences 119, E2116812119
Rampen, S.W., Friedl, T., Tybalka, N., Thiel, V.
