Articles | Volume 17, issue 7
https://doi.org/10.5194/bg-17-2135-2020
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, Yasong Wang, Yongsheng Liu, Xi Zhang, Linlin Shi, and Yunping Xu

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AR: Author's response | RR: Referee report | ED: Editor decision
ED: Publish subject to minor revisions (review by editor) (24 Feb 2020) by Silvio Pantoja
AR by Yunping Xu on behalf of the Authors (27 Feb 2020)  Author's response   Manuscript 
ED: Publish subject to minor revisions (review by editor) (18 Mar 2020) by Silvio Pantoja
AR by Yunping Xu on behalf of the Authors (19 Mar 2020)  Author's response   Manuscript 
ED: Publish as is (23 Mar 2020) by Silvio Pantoja
AR by Yunping Xu on behalf of the Authors (23 Mar 2020)
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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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