Occurrence of 1-O-monoalkyl glycerol ether lipids in ocean waters and sediments
Occurrence of 1-O-monoalkyl glycerol ether lipids in ocean waters and sediments
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DOI：
10.1016/j.orggeochem.2013.10.003
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发表时间：
2014-01-01
影响因子：
3
通讯作者：
Pancost, Richard D.
中科院分区：
文献类型：
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作者：
Hernandez-Sanchez, Maria T.;Homoky, William B.;Pancost, Richard D.
1-O-单烷基甘油醚（MAGEs）在海洋沉积物中的存在通常归因于硫酸盐还原剂的存在。然而，对海洋领域内其他可能的来源知之甚少。我们研究了南大洋和南大西洋东部表层水和底层沉积物中悬浮颗粒有机物中MAGE的浓度和分布。在这两种环境的地表水中都发现了MAGEs（包括单不饱和、双不饱和和分支），表明MAGEs可能是好氧细菌。支持这一点，我们发现浮游植物生物标志物的浓度和MAGE之间的显着相关性。法师在南大洋和南大西洋表层海水中的分布不同，南大洋海水中的分子链较长，不饱和组分较多，这可能是对较低表层温度的一种适应。沉积法师分布显着不同的上覆水，我们建议是一个额外的沉积源的结果。然而，MAGEs存在于好氧和含氮-含铁沉积物中，这表明除了硫酸盐还原剂之外还有其他细菌来源。(C)2013爱思唯尔有限公司版权所有。
The occurrence of 1-O-monoalkyl glycerol ethers (MAGEs) in marine sediments is typically attributed to the presence of sulfate reducers. However, little is known about other possible sources within the marine realm. We have examined the concentrations and distributions of MAGEs in suspended particulate organic matter from surface water and underlying sediments of the Southern Ocean and the eastern South Atlantic Ocean. MAGEs (including monounsaturated, diunsaturated and branched) were found in surface water from both settings, suggesting a planktonic source, likely aerobic bacteria. Supporting this, we found a significant correlation between the concentrations of phytoplankton biomarkers and MAGEs. MAGE distributions in Southern Ocean and South Atlantic surface water differed, with longer chain length and more unsaturated components in Southern Ocean water, which we suggest could be an adaptation to lower surface temperature. Sedimentary MAGE distributions were significantly different from those of overlying water, which we propose to be the result of an additional sedimentary source. However, MAGEs were present in both oxic and nitrogenous-ferruginous sediments, suggesting other bacterial sources besides sulfate reducers. (C) 2013 Elsevier Ltd. All rights reserved.