Production of Labile Protein-Like Dissolved Organic Carbon Associated With Anaerobic Methane Oxidization in the Haima Cold Seeps, South China Sea
Production of Labile Protein-Like Dissolved Organic Carbon Associated With Anaerobic Methane Oxidization in the Haima Cold Seeps, South China Sea
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南海海马冷泉中与厌氧甲烷氧化相关的不稳定蛋白质类溶解有机碳的产生
DOI：
10.3389/fmars.2021.797084
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发表时间：
2021-12
影响因子：
3.7
通讯作者：
Duofu Chen
中科院分区：
文献类型：
--
作者：
Tingcang Hu;Min Luo;Yunping Xu;Shanggui Gong;Duofu Chen
富含甲烷的流体从海底逸出的冷渗漏通常支持大量的化学合成生物体和相关的动物。除了向海底输送大量甲烷外，冷渗漏还有助于深海中老化的溶解有机碳(DOC)池的形成。本文分析了中国南海北部“海马冷泉”的两个沉积物岩芯和附近的一个参考岩心的孔隙水硫酸盐和溶解有机碳浓度、溶解有机碳的δ13C和溶解有机物(DOM)的光学性质。较高的有机碳浓度(0.9~3.7 mm)和极低的δ13C值(−43.9~−76.2‰)表明甲烷在渗漏沉积物中转化为沉积有机碳库。荧光激发-发射矩阵的平行因子分析(PARAFAC)表明，与参考岩心相比，渗漏岩心中不稳定的类蛋白质组分(C2和C4)的荧光强度更高，而难降解的类腐殖质组分(C1和C3)的荧光强度更低。C2的强度与渗漏沉积物中DOC浓度和δ13C-DOC呈正相关，表明甲烷厌氧氧化产生了不稳定的类蛋白质DOM。此外，低腐殖化指数(Hix)和高生物指数(Bix)也表明渗漏岩心中相对不稳定的DOM的产生加剧，降解程度低于参考岩心。因此，我们强调，甲烷衍生的DOC由于其相对不稳定的性质，可以作为异养微生物群落的重要碳源和能源。
Cold seeps where methane-rich fluids escape from the seafloor generally support enormous biomass of chemosynthetic organisms and associated fauna. In addition to transporting a great amount of methane toward the seafloor, cold seeps also contribute to the aged, dissolved organic carbon (DOC) pool in the deep ocean. Here, two sediment cores from the “Haima cold seeps,” northern South China Sea and a nearby reference core were analyzed for pore-water sulfate and DOC concentrations, δ13C of DOC, and optical properties of dissolved organic matter (DOM). High DOC concentrations (0.9–3.7 mM) accompanied by extremely low δ13C values (−43.9 to −76.2‰) suggest the conversion of methane into sedimentary DOC pool in the seep sediments. Parallel factor analysis (PARAFAC) of the fluorescence excitation-emission matrices shows higher fluorescent intensities of labile protein-like components (C2 and C4) and lower fluorescent intensities of refractory humic-like components (C1 and C3) in the seep cores compared to the reference core. The intensity of C2 is positively correlated with DOC concentrations and δ13C-DOC in the seep sediments, suggesting that the labile protein-like DOM was produced by the anaerobic oxidation of methane (AOM). Moreover, low humification index (HIX) and high biological index (BIX) values also indicate intensified production of relatively labile DOM with lower degradation degree in the seep cores compared to the reference core. Hence, we highlight that methane-derived DOC may serve as important carbon and energy sources for heterotrophic microbial communities due to its relatively labile nature.
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影响因子：
3.7
作者：
A. Peketi;A. Mazumdar (corresponding author);R. K. Joshi;D. J. Patil;P. L. Srinivas;A. M. Dayal
通讯作者：
A. Peketi;A. Mazumdar (corresponding author);R. K. Joshi;D. J. Patil;P. L. Srinivas;A. M. Dayal
影响因子：
5
作者：
Schmidt, Frauke;Elvert, Marcus;Hinrichs, Kai-Uwe
通讯作者：
Hinrichs, Kai-Uwe
DOI：
10.2307/j.ctvx8b6p2
发表时间：
2020-03
期刊：
--
影响因子：
--
作者：
R. Berner
通讯作者：
R. Berner
影响因子：
5
作者：
K. Kuivila;J. Murray;A. Devol
通讯作者：
K. Kuivila;J. Murray;A. Devol
DOI：
10.3389/feart.2020.552731
发表时间：
2020-12
期刊：
--
影响因子：
--
作者：
Muhammed Fatih Sert;J. D’Andrilli;Friederike Gründger;H. Niemann;M. Granskog;A. Pavlov;B. Ferré;A. Silyakova
通讯作者：
Muhammed Fatih Sert;J. D’Andrilli;Friederike Gründger;H. Niemann;M. Granskog;A. Pavlov;B. Ferré;A. Silyakova