Articles | Volume 19, issue 6
https://doi.org/10.5194/bg-19-1723-2022
© Author(s) 2022. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/bg-19-1723-2022
© Author(s) 2022. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
24 Mar 2022
Research article |
| 24 Mar 2022
| 24 Mar 2022
Aqueous system-level processes and prokaryote assemblages in the ferruginous and sulfate-rich bottom waters of a post-mining lake
Daniel A. Petrash
CORRESPONDING AUTHOR
SoWa Research Infrastructure, Biology Centre of the Czech Academy of Sciences, České
Budějovice, 370 05, Czechia
Department of Environmental Geochemistry and Biogeochemistry, Czech Geological Survey, Prague, 152 00, Czechia
Ingrid M. Steenbergen
SoWa Research Infrastructure, Biology Centre of the Czech Academy of Sciences, České
Budějovice, 370 05, Czechia
Department of Ecosystem Biology, University of South Bohemia, České Budějovice, 370 05,
Czechia
Astolfo Valero
SoWa Research Infrastructure, Biology Centre of the Czech Academy of Sciences, České
Budějovice, 370 05, Czechia
Department of Ecosystem Biology, University of South Bohemia, České Budějovice, 370 05,
Czechia
Travis B. Meador
SoWa Research Infrastructure, Biology Centre of the Czech Academy of Sciences, České
Budějovice, 370 05, Czechia
Department of Ecosystem Biology, University of South Bohemia, České Budějovice, 370 05,
Czechia
Tomáš Pačes
Department of Environmental Geochemistry and Biogeochemistry, Czech Geological Survey, Prague, 152 00, Czechia
Christophe Thomazo
UMR CNRS 6282 Biogéosciences, University of Burgundy, Dijon, 21000, France
Institut Universitaire de France, Paris, 75000, France
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Jolanta Niedźwiecka, Roey Angel, Petr Čapek, Ana Catalina Lara, Stanislav Jabinski, Travis B. Meador, and Hana Šantrůčková
SOIL, 11, 735–753, https://doi.org/10.5194/soil-11-735-2025, https://doi.org/10.5194/soil-11-735-2025, 2025
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Studies on how microbes use C in soils typically assume oxic conditions but often overlook anaerobic processes and extracellular metabolite release. We examined how O2 and Fe content affect C mineralisation in forest soils by tracking 13C flow into biomass, CO2, metabolites, and active microbes under oxic and anoxic conditions. Results showed that anoxic conditions preserved C longer, especially in high-Fe soils. We conclude that microbial exudates play a role in anoxic C stabilisation.
Stanislav Jabinski, Vítězslav Kučera, Marek Kopáček, Jan Jansa, and Travis B. Meador
Biogeosciences, 22, 3127–3141, https://doi.org/10.5194/bg-22-3127-2025, https://doi.org/10.5194/bg-22-3127-2025, 2025
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Microbial production is a key parameter in estimation of organic matter cycling in environmental systems, and fungi play a major role as decomposers. In order to improve investigation of fungal production and turnover times in environmental studies, we determined the isotopic signals encoded into lipid biomarkers of fungal pure cultures growing on various carbon substrates in media with isotopically labeled water and bicarbonate.
Karim Benzerara, Agnès Elmaleh, Maria Ciobanu, Alexis De Wever, Paola Bertolino, Miguel Iniesto, Didier Jézéquel, Purificación López-García, Nicolas Menguy, Elodie Muller, Fériel Skouri-Panet, Sufal Swaraj, Rosaluz Tavera, Christophe Thomazo, and David Moreira
Biogeosciences, 20, 4183–4195, https://doi.org/10.5194/bg-20-4183-2023, https://doi.org/10.5194/bg-20-4183-2023, 2023
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Iron and manganese are poorly soluble in oxic and alkaline solutions but much more soluble under anoxic conditions. As a result, authigenic minerals rich in Fe and/or Mn have been viewed as diagnostic of anoxic conditions. However, here we reveal a new case of biomineralization by specific cyanobacteria, forming abundant Fe(III)- and Mn(IV)-rich amorphous phases under oxic conditions in an alkaline lake. This might be an overlooked biotic contribution to the scavenging of Fe from water columns.
Robin Havas, Christophe Thomazo, Miguel Iniesto, Didier Jézéquel, David Moreira, Rosaluz Tavera, Jeanne Caumartin, Elodie Muller, Purificación López-García, and Karim Benzerara
Biogeosciences, 20, 2405–2424, https://doi.org/10.5194/bg-20-2405-2023, https://doi.org/10.5194/bg-20-2405-2023, 2023
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Dissolved organic carbon (DOC) is a reservoir of prime importance in the C cycle of both continental and marine systems. It has also been suggested to influence the past Earth climate but is still poorly characterized in ancient-Earth-like environments. In this paper we show how DOC analyses from modern redox-stratified lakes can evidence specific metabolic reactions and environmental factors and how these can help us to interpret the C cycle of specific periods in the Earth's past.
Robin Havas, Christophe Thomazo, Miguel Iniesto, Didier Jézéquel, David Moreira, Rosaluz Tavera, Jeanne Caumartin, Elodie Muller, Purificación López-García, and Karim Benzerara
Biogeosciences, 20, 2347–2367, https://doi.org/10.5194/bg-20-2347-2023, https://doi.org/10.5194/bg-20-2347-2023, 2023
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We describe the C cycle of four modern stratified water bodies from Mexico, a necessary step to better understand the C cycle of primitive-Earth-like environments, which were dominated by these kinds of conditions. We highlight the importance of local external factors on the C cycle of these systems. Notably, they influence the sensitivity of the carbonate record to environmental changes. We also show the strong C-cycle variability among these lakes and their organic C sediment record.
Pierre Nevers, Julien Bouchez, Jérôme Gaillardet, Christophe Thomazo, Delphine Charpentier, Laëticia Faure, and Catherine Bertrand
Earth Surf. Dynam., 9, 487–504, https://doi.org/10.5194/esurf-9-487-2021, https://doi.org/10.5194/esurf-9-487-2021, 2021
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Short summary
We spectroscopically evaluated the gradients of dissolved C, N, S, Fe and Mn in a newly formed redox-stratified lake. The lake features an intermediate redox state between nitrogenous and euxinic conditions that encompasses vigorous open sulfur cycling fuelled by the reducible Fe and Mn stocks of the anoxic sediments. This results in substantial bottom water loads of dissolved iron and sulfate. Observations made in this ecosystem have relevance for deep-time paleoceanographic reconstructions.
We spectroscopically evaluated the gradients of dissolved C, N, S, Fe and Mn in a newly formed...
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