TY - JOUR
T1 - Abundance and distribution of fatty acids in sediments of the South Mid-Atlantic Ridge
AU - Huang, Xin
AU - Zeng, Zhigang
AU - Chen, Shuai
AU - Yin, Xuebo
AU - Wang, Xiaoyuan
AU - Ma, Yao
AU - Yang, Baoju
AU - Rong, Kunbo
AU - Shu, Yunchao
AU - Jiang, Tao
N1 - Publisher Copyright:
© 2015, Science Press, Ocean University of China and Springer-Verlag Berlin Heidelberg.
PY - 2015/4
Y1 - 2015/4
N2 - Sediment samples obtained from the South Mid-Atlantic Ridge were studies by gas chromatography-mass spectrometer (GC-MS) for the abundance and distributions of total fatty acids (TFAs). Approximately 34 fatty acids were identified, with the chain-lengths ranging from C12 to C30. The total concentrations of TFAs (ΣTFA) ranged from 7.15 to 30.09 μg g−1 dry sediment, and ΣTFA was weakly correlated with bitumen content (R2 = 0.69). The ΣTFA of samples around hydrothermal areas were significantly higher than that of samples away from hydrothermal areas, indicating intense primary production and large biomass in the hydrothermal areas, and suggesting a close relationship between hydrothermal activity and ΣTFA of samples. The characteristics of the TFA composition in the present study are rich in monounsaturated fatty acids and lacking in polyunsaturated fatty acids, and the ratios between the concentrations of monounsaturated fatty acids and ΣTFAs in samples close to the hydrothermal areas, are about 0.8, but for samples far from the hydrothermal areas, they are only about 0.5. Several fatty acids (e.g., a/iC15:0 and C16:1ω7), which are signature biomarkers for sulfur-metabolizing bacteria, show the same distribution trend as ΣTFA of samples, further highlighting the close relationship between fatty acid content and hydrothermal activity and/or hydrothermal communities. The metabolic activities of hydrothermal communities, especially those of microorganisms, are likely the main source of fatty acids in samples.
AB - Sediment samples obtained from the South Mid-Atlantic Ridge were studies by gas chromatography-mass spectrometer (GC-MS) for the abundance and distributions of total fatty acids (TFAs). Approximately 34 fatty acids were identified, with the chain-lengths ranging from C12 to C30. The total concentrations of TFAs (ΣTFA) ranged from 7.15 to 30.09 μg g−1 dry sediment, and ΣTFA was weakly correlated with bitumen content (R2 = 0.69). The ΣTFA of samples around hydrothermal areas were significantly higher than that of samples away from hydrothermal areas, indicating intense primary production and large biomass in the hydrothermal areas, and suggesting a close relationship between hydrothermal activity and ΣTFA of samples. The characteristics of the TFA composition in the present study are rich in monounsaturated fatty acids and lacking in polyunsaturated fatty acids, and the ratios between the concentrations of monounsaturated fatty acids and ΣTFAs in samples close to the hydrothermal areas, are about 0.8, but for samples far from the hydrothermal areas, they are only about 0.5. Several fatty acids (e.g., a/iC15:0 and C16:1ω7), which are signature biomarkers for sulfur-metabolizing bacteria, show the same distribution trend as ΣTFA of samples, further highlighting the close relationship between fatty acid content and hydrothermal activity and/or hydrothermal communities. The metabolic activities of hydrothermal communities, especially those of microorganisms, are likely the main source of fatty acids in samples.
KW - fatty acids
KW - hydrothermal activity
KW - microorganism
KW - sediment
KW - South Mid-Atlantic Ridge
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U2 - 10.1007/s11802-015-2613-1
DO - 10.1007/s11802-015-2613-1
M3 - Article
AN - SCOPUS:84923222098
VL - 14
SP - 277
EP - 283
JO - Journal of Ocean University of China
JF - Journal of Ocean University of China
SN - 1672-5182
IS - 2
ER -