Abundance and distribution of fatty acids within the walls of an active deep-sea sulfide chimney |
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Authors: | Jiwei Li Huaiyang Zhou Xiaotong Peng Meiyan Fu Zhiqiang Chen Huiqiang Yao |
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Institution: | a Guangzhou Institute of Geochemistry Chinese Academy of Sciences, Guangzhou 510640, China;b Graduate University of Chinese Academy of Sciences, Beijing 100049, China;c State Key Laboratory of Marine Geology, Tongji University, Shanghai 200092, China;d Guangzhou Marine Geological Survey, Guangzhou 510760, China |
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Abstract: | Abundance and distribution of total fatty acids (TFAs) were examined along the physicochemical gradient within an active hydrothermal chimney collected from the Main Endeavour segment of Juan de Fuca Ridge. Approximately 27 fatty acids are identified with a chain-length ranging from C12 to C22. From the exterior to the interior of the chimney walls, the total concentrations of TFAs (∑ TFAs) show a trend of evident decrease. The observed compositions of TFAs are rich in bacterial biomarkers especially monounsaturated fatty acids (MUFAs) and minor branched and cyclopropyl FAs. On the basis of the species-specific FAs and bacterial 16SrRNA gene analysis (Li et al., unpublished data), sulfur-based metabolism appears to be the essential metabolic process in the chimney. Furthermore, the sulfur oxidizing bacteria (SOB) are identified as a basic component of microbial communities at the exterior of the hydrothermal chimney, and its proportion shows an inward decrease while the sulfate reducing bacteria (SRB) have an inverse distribution. |
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Keywords: | Abundance Distribution Fatty acids Sulfide chimney SOB SRB |
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