Diagenetic fate of glycerol ethers revealed by two novel isoprenoid hydroxyphytanyl glycerol monoethers and non-isoprenoid alkyl glycerol ethers

Xu, Lanfang; Guan, Huashi; Zheng, Shuai; Liu, Lihua; Tao, Jun

doi:10.1016/j.orggeochem.2021.104344

Cited by 5 publications

(1 citation statement)

References 97 publications

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“…Based on the 16S rRNA gene, the microbial communities, especially ANME, have been investigated with high-throughput sequencing in Haima (Niu et al, 2017;Zhang et al, 2020) and Site F (Cui et al, 2019). As for the SAMO-associated functional groups, ANME, methanogens and/or SRB have been reported in Haima (Jing et al, 2020;Xu et al, 2021;Guan et al, 2022) and Site F (Feng and Chen, 2015;Zhang et al, 2017;Du et al, 2018;Li et al, 2021). In addition, microbial groups involved in DAMO process were also identified in the cold seeps and the Xisha trough in the SCS (Chen et al, 2014;Jing et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

Biogeographic distributions of microbial communities associated with anaerobic methane oxidation in the surface sediments of deep-sea cold seeps in the South China Sea

Jiang

Jing²,

Líu³

et al. 2022

Front. Microbiol.

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Cold seeps are oasis for the microbes in the deep-sea ecosystems, and various cold seeps are located along the northern slope of the South China Sea (SCS). However, by far most microbial ecological studies were limited to specific cold seep in the SCS, and lack of comparison between different regions. Here, the surface sediments (0–4 cm) from the Site F/Haima cold seeps and the Xisha trough in the SCS were used to elucidate the biogeography of microbial communities, with particular interest in the typical functional groups involved in the anaerobic oxidation of methane (AOM) process. Distinct microbial clusters corresponding to the three sampling regions were formed, and significantly higher gene abundance of functional groups were present in the cold seeps than the trough. This biogeographical distribution could be explained by the geochemical characteristics of sediments, such as total nitrogen (TN), total phosphorus (TP), nitrate (NO3−), total sulfur (TS) and carbon to nitrogen ratios (C/N). Phylogenetic analysis demonstrated that mcrA and pmoA genotypes were closely affiliated with those from wetland and mangroves, where denitrifying anaerobic methane oxidation (DAMO) process frequently occurred; and highly diversified dsrB genotypes were revealed as well. In addition, significantly higher relative abundance of NC10 group was found in the Xisha trough, suggesting that nitrite-dependent DAMO (N-DAMO) process was more important in the hydrate-bearing trough, although its potential ecological contribution to AOM deserves further investigation. Our study also further demonstrated the necessity of combining functional genes and 16S rRNA gene to obtain a comprehensive picture of the population shifts of natural microbial communities among different oceanic regions.

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Section: Introductionmentioning

confidence: 99%

Biogeographic distributions of microbial communities associated with anaerobic methane oxidation in the surface sediments of deep-sea cold seeps in the South China Sea

Jiang

Jing²,

Líu³

et al. 2022

Front. Microbiol.

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Biomarker Indicators of Cold Seeps

Guan

Lei

et al. 2023

South China Sea Seeps

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Lipid biomarkers of seep carbonates and sediments retrieved from the Dongsha area, Shenhu, Site F and Haima in the South China Sea (SCS) over the last two decades were studied. Biomarker inventories, microbial consortia, seepage dynamics, and biogeochemical processes of anaerobic oxidation of methane (AOM), aerobic oxidation of methane (AeOM), and oxidation of non-methane hydrocarbons, were reconstructed. Authigenic carbonates contained varying contents of 13C-depleted archaeal and bacterial biomarkers, reflecting their formation as a result of AOM under varying conditions. Except for the typical isoprenoids found in various cold seeps worldwide, 3,7,11,15-tetramethyl hexadecan-1,3-diol and two novel sn2-/sn3-O-hydroxyphytanyl glycerol monoethers with notable 13C-depletion were observed in authigenic carbonates obtained from Haima, which are most likely hydrolysis products of archaea-specific diethers. Furthermore, molecular fossils, compound-specific δ13C values, and mineralogies, were used to trace dominant microbial consortia, seepage activities, and environmental conditions in the cold seep ecosystems of the SCS. In this chapter, the archaeal and bacterial lipid biomarker geochemistry of methane seeps is systematically introduced. AOM, AeOM, oxidation of non-methane hydrocarbons, oil degradation, and the diagenetic fate of glycerol ethers, are further summarized.

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Lessons from lipid biomarkers preserved in methane-seep carbonates from the early Permian of Western Australia

Wang,

Birgel,

Krake

et al. 2024

Chemical Geology

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Diagenetic fate of glycerol ethers revealed by two novel isoprenoid hydroxyphytanyl glycerol monoethers and non-isoprenoid alkyl glycerol ethers

Cited by 5 publications

References 97 publications

Biogeographic distributions of microbial communities associated with anaerobic methane oxidation in the surface sediments of deep-sea cold seeps in the South China Sea

Biogeographic distributions of microbial communities associated with anaerobic methane oxidation in the surface sediments of deep-sea cold seeps in the South China Sea

Biomarker Indicators of Cold Seeps

Lessons from lipid biomarkers preserved in methane-seep carbonates from the early Permian of Western Australia

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