open access

https://hdl.handle.net/2115/38469

Biomarker Compositions of Dinoflagellates and Their Applications for Paleoenvironmental Proxies

英語

4α-Methyl sterol

2008

21st Century COE for Neo-Science of Natural History, Hokkaido University

Origin and Evolution of Natural Diversity : Proceedings of the International Symposium, The Origin and Evolution of Natural Diversity, held from 1-5 October 2007 in Sapporo, Japan

223-226

International Symposium, "The Origin and Evolution of Natural Diversity". 1–5 October 2007. Sapporo, Japan.

Four motile cells of autotrophic dinoflagellates, Peridinium umbonatum var. inaequale, Akashiwo sanguinea, Scrippsiella tinctoria, and Prorocentrum micans, commonly contain five major sterols: cholesterol, 4-methylcholestan-3-ol, 4, 24-dimethylcholestan-3-ol, dinosterol and dinostanol. A motile cell of heterotrophic dinoflagellate, Protoperidinium crassipes, contains cholesterol, 4, 24- dimethylcholestan-3-ol, dinosterol, dinostanol and 4-tetramethylcholestan-3-ol as major free sterols. Dinosterol concentration of heterotrophic dinoflagellate is about 4-12 times higher than those of autotrophic species, suggesting that the heterotrophic dinoflagellate is important source of dinosterol in some sediments. 4-Methylcholestan-3-ol and 4-tetramethylcholestan-3-ol occur respectively in autotrophic and heterotrophic dinoflagellates are believed to serve as potential biomarkers in respective types. Resting cyst of P. inaequale contains 4-methylcholestan-3β-ol, 4, 24-dimethyl-5α-cholestan-3β-ol, dinosterol, dinostanol, and unknown C31 sterol as major free sterols. The unknown C31 sterol detected only in resting cyst could have been produced during resting stage. This compound may serve as a potential biomarker for resting cysts of dinoflagellate.

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BA85842508