Long-chain branched/cyclic alkanes in recent sediment of Lake Fuxian and their environmental implications |
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Authors: | Yongdong Zhang Yaling Su Zhengwen Liu Xiangchao Chen Jinlei Yu Xiaodan Di Miao Jin |
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Affiliation: | 1. State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography & Limnology, Chinese Academy of Sciences, Nanjing, 210008, China 2. Department of Ecology and Research Center of Hydrobiology, Jinan University, Guangzhou, 510632, China
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Abstract: | Lake Fuxian is a large, deep, and oligotrophic freshwater lake. In recent sediment of this lake, a series of branched and cyclic alkanes, including branched alkanes with one or two quaternary carbon atoms (C2n compounds), alkylcycloheptane, and alkylcyclohexane, were detected in high abundance. For each homolog of long-chain branched/cyclic alkanes, molecules with only an odd or even carbon number were present in the sediment. The abundance variation of each compound homolog corresponded to those of other compound homolog in the section, indicating the same origin of these compounds. The concentrations of long-chain branched/cyclic alkanes in the sediment profile exhibited variations similar to those of phytoplankton biomarkers, such as 3-methyl-alkanes, short-chain odd carbon n-alkanes, hopene, polyunsaturated fatty acids, phytol, sterols, and long-chain alkyl diols, but slightly different from those of long-chain odd carbon n-alkanes, which are ubiquitous biomarkers for higher plants. Therefore, the C2n compounds and long-chain cyclic alkanes in the lake sediment were most likely produced by algae and bacteria in the water, primarily, by the heterotrophic bacteria in the moderately oxygenated waters, which flourishing might be the results of specific water environments in Lake Fuxian. |
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Keywords: | C2n compounds Long-chain cyclicalkane Lake Fuxian Biomarker Algae andbacteria |
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