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Publisher DOI: 10.1111/gbi.12492
Title: Microbially promoted calcite precipitation in the pelagic redoxcline: elucidating the formation of the turbid layer
Language: English
Authors: Leberecht, Kerstin 
Ritter, Simon Michael 
Lapp, Christian Jonas 
Klose, Lukas 
Eschenröder, Julian 
Scholz, Christian 
Kühnel, Sebastian 
Stinnesbeck, Wolfgang 
Kletzin, Arnulf 
Isenbeck-Schröter, Margot 
Gescher, Johannes 
Keywords: biogeochemistry; chemolithoautotrophy; microbially induced calcite precipitation; redoxcline; sulfide oxidation
Issue Date: 5-May-2022
Publisher: Wiley-Blackwell
Source: Geobiology 20 (4) : 498-517 (2022-07)
Abstract (english): 
Large bell-shaped calcite formations called “Hells Bells” were discovered underwater in the stratified cenote El Zapote on the Yucatán Peninsula, Mexico. Together with these extraordinary speleothems, divers found a white, cloudy turbid layer into which some Hells Bells partially extend. Here, we address the central question if the formation of the turbid layer could be based on microbial activity, more specifically, on microbially induced calcite precipitation. Metagenomic and metatranscriptomic profiling of the microbial community in the turbid layer, which overlaps with the pelagic redoxcline in the cenote, revealed chemolithoautotrophic Hydrogenophilales and unclassified ß-Proteobacteria as the metabolic key players. Bioinformatic and hydrogeochemical data suggest chemolithoautotrophic oxidation of sulfide to zero-valent sulfur catalyzed by denitrifying organisms due to oxygen deficiency. Incomplete sulfide oxidation via nitrate reduction and chemolithoautotrophy are both proton-consuming processes, which increase the pH in the redoxcline favoring authigenic calcite precipitation and may contribute to Hells Bells growth. The observed mechanism of microbially induced calcite precipitation is potentially applicable to many other stagnant sulfate-rich water bodies.
DOI: 10.15480/882.4440
ISSN: 1472-4669
Journal: Geobiology 
Institute: Technische Mikrobiologie V-7 
Document Type: Article
Project: Projekt DEAL 
More Funding information: This research has been supported by the Deutsche LEBERECHT et al. | 515 Forschungsgemeinschaft (grants no. STI128/28 and STI128/36) and the CONACYT-FONCICYT-DADC (grant no. 000000000278227).
License: CC BY-NC-ND 4.0 (Attribution-NonCommercial-NoDerivatives) CC BY-NC-ND 4.0 (Attribution-NonCommercial-NoDerivatives)
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