Alice Bosco‐Santos

Imprint of eutrophication on methane-cycling microbes in freshwater sediment

Alice Bosco‐Santos, Eulalie Rose Beyala Bekono, Santona Khatun, Marie‐Ève Monchamp et autres

Abstract. Eutrophication can alter methane (CH4) cycling in lakes, yet its long-term effect on sediment microbial communities remains unclear. To elucidate these effects, we analyzed a 400-year-old sediment record from the historically eutrophied Lake Joux, Switzerland, combining porewater and solid-phase geochemistry with …

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Comment on egusphere-2025-4489

Alice Bosco‐Santos, Eulalie Rose Beyala Bekono, Santona Khatun, Marie‐Ève Monchamp et autres

Abstract. Eutrophication can alter methane (CH4) cycling in lakes, yet its long-term effect on sediment microbial communities remains unclear. To elucidate these effects, we analyzed a 400-year-old sediment record from the historically eutrophied Lake Joux, Switzerland, combining porewater and solid-phase geochemistry with …

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Abundance–activity decoupling in sulfur-cycling bacteria reflects viral infection types in meromictic lakes

Jordan R. Walker, Natascha S. Varona, Bailey Wallace, Abelardo Aguilar-Cámara et autres

Meromictic lakes serve as analogs of redox-stratified ancient oceans with well-mixed surface waters and anoxic bottoms. In sulfide-rich lakes, purple and green sulfur bacteria (PSB, GSB) dominate the anoxic zones where light penetrates, and their biosignatures can guide interpretations of geologic records. …

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Supplementary material to "Imprint of eutrophication on methane-cycling microbes in freshwater sediment"

Alice Bosco‐Santos, Eulalie Rose Beyala Bekono, Santona Khatun, Marie‐Ève Monchamp et autres

Supplementary Table 1.Data used to construct geochemical profiles of porewater, solid-phase compounds, and dissolved gases in Lake Joux sediments for Figure 2 panels A to M.

Oxic microbial ferrihydrite reduction rates of Shewanella oneidensis and the potential for Fe mobilization in oxic sediments

Giulia Ceriotti, Alice Bosco‐Santos, Jasmine S. Berg

Microbially mediated reduction of ferrihydrite (Fe(III) oxyhydroxide) plays a crucial role in Fe cycling, and hence nutrient and contaminant cycling, in subsurface environments. This process is typically considered a strictly anaerobic process confined to anoxic microsites within oxic subsurface environments. However, recent …

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Oxic microbial ferrihydrite reduction rates of Shewanella oneidensis and the potential for Fe mobilization in oxic sediments

Giulia Ceriotti, Alice Bosco‐Santos, Jasmine S. Berg

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Is there a specific “timing of mineralization” in gold deposits?

Wendell Fabricio-Silva, María Emilia Schutesky, Hartwig E. Frimmel, Denis Fougerouse et autres

Mineral chemistry, stable isotope geochemistry, deformation microstructures, and compositional zoning are keys to unravel the mineralization history of gold-bearing sulfide assemblages. As such, textural and compositional domains can represent (i) primary mineralization processes associated with crystallization and (ii) processes related to remobilization. …

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Viral activity in lake analogs of anoxic early Earth oceans

Natascha S. Varona, Bailey Wallace, Alice Bosco‐Santos, Julianna Mullinax et autres

BACKGROUND: Meromictic lakes, with their stratified water columns, are modern analogs for ancient euxinic (anoxic and sulfidic) oceans, where anaerobic sulfur-oxidizing purple and green sulfur bacteria (PSB and GSB) dominated as primary producers. Recent studies suggest a potential role of viruses in …

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Integrated Approach to Investigate Magnetite Cycle in Marine Methanic Sediments

Adi Rivlin, Alice Bosco‐Santos, Valeria Boyko, Ron Shaar et autres

Magnetite (Fe3O4), a ubiquitous sedimentary iron mineral, is crucial for paleomagnetic records preservation. However, reactive ferric iron minerals, including magnetite, can undergo reduction in aquatic sediments above and within the sulfidic zone and at the Sulfate-Methane Transition Zone (SMTZ), resulting in the …

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Episodic drought and flooding impacts on the destabilization of mineral-associated organic matter in the rhizosphere

Junna Frei, Floriane Jamoteau, Egon van der Loo, Alice Bosco‐Santos et autres

The majority of soil carbon resides in mineral-associated organic matter (MAOM) in most soils. MAOM is assumed to be relatively inert to environmental change because it is protected from microbial activity thus contributing substantially to soil carbon storage. However, plants and associated …

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Decoupling microbial iron reduction from anoxic microsite formation in oxic sediments: a microscale investigation through microfluidic models

Giulia Ceriotti, Alice Bosco‐Santos, Sergey M. Borisov, Jasmine S. Berg

Iron (Fe) reduction is one of the oldest microbial processes on Earth. After the atmosphere and ocean became oxygenated, this anaerobic process was relegated to niche anoxic environments. However, evidence of Fe reduction in oxic, partially saturated subsurface systems, such as soils …

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Diagenetic fate of greigite in sediment from Lake St. Moritz, Switzerland

Philip Werner, Virgil Pasquier, Alice Bosco‐Santos, Jasmine S. Berg et autres