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Source and implication of fatty acids in surface sediments from the Pearl River Mouth Basin, South China Sea

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Title Source and implication of fatty acids in surface sediments from the Pearl River Mouth Basin, South China Sea
 
Creator Mao, Shengyi
Zhu, Xiaowei
Sun, Yongge
Guan, Hongxiang
Wu, Daidai
Wu, Nengyou
 
Subject Fatty acids
Carbon isotopic
South China Sea
Pearl River Mouth Basin
 
Description 1528-1539
Present study consists the fatty acid composition of five samples of Site 4B surface sediment from the Pearl River Mouth Basin in the South China Sea. Total fatty acid (TFA) content of the ranged from 5.14 μg/g to 8.99 μg/g (μg FA/g dry sediment), and the carbon number ranged from C12 to C32. The fatty acids detected in the five surface samples include the normal saturated fatty acids, branched-chain fatty acids, monounsaturated fatty acids, polyunsaturated fatty acids, and isoprenoid acids. Short-chain fatty acids in the normal saturated fatty acids were mainly from the marine microorganisms, whereas the long-chain fatty acids were from terrigenous higher plants. The higher concentration of short-chain fatty acids relative to the long-chain fatty acids indicates that the input from marine microorganisms in the surface sediment is far greater than that from terrigenous higher plants. The branched-chain fatty acids i/a15:0, i/a17:0, and 10me16:0 and the monounsaturated fatty acids 18:1ω9 and 16:1ω9 were mainly synthesized by sulfate-reducing bacteria, whereas 16:1ω7 was from the sulfur-oxidizing bacteria. Relative content of the different fatty acids indicate that the surface sediment is dominated by a reductive environment. In addition, eight isoprenoid acids including phytanic acid, 17β(H),21β(H)-32-bi-homohopanoic acid, and pristane acid were detected in the surface sediment, and they mainly originated from chlorophyll a and bacteria.
 
Date 2016-07-21T09:42:56Z
2016-07-21T09:42:56Z
2015-10
 
Type Article
 
Identifier 0975-1033 (Online); 0379-5136 (Print)
http://nopr.niscair.res.in/jspui/handle/123456789/34962
 
Language en_US
 
Rights CC Attribution-Noncommercial-No Derivative Works 2.5 India
 
Publisher NISCAIR-CSIR, India
 
Source IJMS Vol.44(10) [October 2015]