Articles | Volume 17, issue 7
Biogeosciences, 17, 2135–2148, 2020
https://doi.org/10.5194/bg-17-2135-2020
Biogeosciences, 17, 2135–2148, 2020
https://doi.org/10.5194/bg-17-2135-2020

Research article 17 Apr 2020

Research article | 17 Apr 2020

Predominance of hexamethylated 6-methyl branched glycerol dialkyl glycerol tetraethers in the Mariana Trench: source and environmental implication

Wenjie Xiao et al.

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Raw data about brGDGTs in Mariana Trench and global environmental settings Wenjie Xiao, Yasong Wang, Yongsheng Liu, Xi Zhang, Linlin Shi, and Yunping Xu https://doi.org/10.6084/m9.figshare.9896120.v1

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Short summary
The hadal zone (6–11 km depth) is the least explored habitat on Earth. We studied microbial branched glycerol dialkyl glycerol tetraethers (brGDGTs) in the Challenger Deep, Mariana Trench. One unique feature is the strong predominance of 6-methyl brGDGT, which likely reflects an adaption of brGDGT-producing bacteria to alkaline seawater and low temperature. BrGDGTs, with elemental and isotopic data, suggest an autochthonous product for brGDGT. A new approach is proposed for brGDGT sourcing.
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