Geochemical evidence for arsenic cycling in living microbialites of a High Altitude Andean Lake (Laguna Diamante, Argentina)

Sancho-Tomás, María; Somogyì, Á.; Medjoubi, Kadda; Bergamaschi, Antoine; Visscher, Pieter T.; Driessche, Alexander E. S. Van; Gérard, Emmanuelle; Farı́as, Marı́a Eugenia; Contreras, Manuel; Philippot, Pascal

doi:10.1016/j.chemgeo.2020.119681

Cited by 14 publications

(6 citation statements)

References 63 publications

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“…Diamante Lake is known to be among the aqueous environments displaying high arsenic concentrations 22 , 25 , 59 , reinforcing the repeatedly mentioned presence of genes related to its resistance. Proportional differences between “Resistance to antibiotics and toxic compounds” categorizable protein coding genes belonging to the “Virulence, Disease and Defense” SEED subsystem showed that arsenic resistance is more abundant in the Diamante Lake plasmidome than in that of the Puquio de Campo Naranja (Fig.…”

Section: Resultsmentioning

confidence: 82%

Assessment of the plasmidome of an extremophilic microbial community from the Diamante Lake, Argentina

Perez

Saona

Farı́as

et al. 2021

Sci Rep

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Diamante Lake located at 4589 m.a.s.l. in the Andean Puna constitutes an extreme environment. It is exposed to multiple extreme conditions such as an unusually high concentration of arsenic (over 300 mg L−1) and low oxygen pressure. Microorganisms thriving in the lake display specific genotypes that facilitate survival, which include at least a multitude of plasmid-encoded resistance traits. Hence, the genetic information provided by the plasmids essentially contributes to understand adaptation to different stressors. Though plasmids from cultivable organisms have already been analyzed to the sequence level, the impact of the entire plasmid-borne genetic information on such microbial ecosystem is not known. This study aims at assessing the plasmidome from Diamante Lake, which facilitates the identification of potential hosts and prediction of gene functions as well as the ecological impact of mobile genetic elements. The deep-sequencing analysis revealed a large fraction of previously unknown DNA sequences of which the majority encoded putative proteins of unknown function. Remarkably, functions related to the oxidative stress response, DNA repair, as well as arsenic- and antibiotic resistances were annotated. Additionally, all necessary capacities related to plasmid replication, mobilization and maintenance were detected. Sequences characteristic for megaplasmids and other already known plasmid-associated genes were identified as well. The study highlights the potential of the deep-sequencing approach specifically targeting plasmid populations as it allows to evaluate the ecological impact of plasmids from (cultivable and non-cultivable) microorganisms, thereby contributing to the understanding of the distribution of resistance factors within an extremophilic microbial community.

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Section: Resultsmentioning

confidence: 82%

Assessment of the plasmidome of an extremophilic microbial community from the Diamante Lake, Argentina

Perez

Saona

Farı́as

et al. 2021

Sci Rep

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“…4 ). Similarly, microbialites of modern extreme volcanic crater lakes are marked by As(III) enrichment relative to As(V) in diffused calcite patterns, with the predominance of As(V) in globular As-rich phases located within organic matter 70 . Like the conditions identified in the present study, these crater lakes are characterized by elevated salinity, pH, and elevated As concentrations 71 .…”

Section: Discussionmentioning

confidence: 99%

Blooming of a microbial community in an Ediacaran extreme volcanic lake system

Chraiki

Fru

Somogyì

et al. 2023

Sci Rep

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Ancient aquatic sediments are critical archives for studying early microbial life and the types of environments in which they thrived. The recently characterized Amane Tazgart microbialites in the Anti-Atlas, Morocco, are a rare and well-preserved non-marine deposit that evolved in an alkaline volcanic lake setting during the Ediacaran Period. A multiproxy geochemical toolbox reveals evidence pointing to spatio-temporal ecosystem organization and succession related to changing lake water chemistry. This is marked by secular transition from a cold/dry climate, hypersaline alkaline thermophilic and anoxic–oxic community, to a stable state warm/wet climate fully oxygenated fresh to brackish water ecosystem, predominated by oxygenic stromatolites. Extreme dissolved Arsenic concentrations suggest that these polyextremophiles required robust detoxification mechanisms to circumvent arsenic toxicity and phosphate deficiency. We propose that self-sustaining and versatile anoxic to oxic microbial ecosystems thrived in aquatic continental settings during the Ediacaran Period, when complex life co-evolved with a rise in atmospheric oxygen content.

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“…Due to the volcanic activity in the region, hydrothermal input is a common component in several water bodies of the Central Andes (e.g. Albarracín et al., 2016 ; Della Vedova et al., 2022 ; Farías et al., 2013 ; Sancho‐Tomás et al., 2020 ). The water mixing facilitated by these components positions Laguna Verde as an attractive system for microbialite‐producing microorganisms (Beeler et al., 2020 ; Chagas et al., 2016 ; Gomez et al., 2014 ; Warden et al., 2019 ).…”

Section: Discussionmentioning

confidence: 99%

Geomicrobiological characterization of the evaporitic ecosystem in the hypersaline lake Laguna Verde (Andean Puna, Northwestern Argentina)

Saona,

Villafañe,

Carrizo

et al. 2024

Ecology and Evolution

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Laguna Verde's dome‐shaped structures are distinctive formations within the Central Andes, displaying unique geomicrobiological features. This study represents a pioneering investigation into these structures, assessing their formation, associated taxa, and ecological significance. Through a multifaceted approach that includes chemical analysis of the water body, multiscale characterization of the domes, and analysis of the associated microorganisms, we reveal the complex interplay between geology and biology in this extreme environment. The lake's alkaline waters that are rich in dissolved cations and anions such as chloride, sodium sulfate, and potassium, coupled with its location at the margin of the Antofalla salt flat, fed by alluvial fans and hydrothermal input, provide favorable conditions for mineral precipitation and support for the microorganism's activity. Laguna Verde's dome‐shaped structures are mainly composed of gypsum and halite, displaying an internal heterogeneous mesostructure consisting of three zones: microcrystalline, organic (orange and green layers), and crystalline. The green layer of the organic zone is predominantly composed of Proteobacteria, Bacteroidetes, and Cyanobacteria, while the orange layer is mostly inhabited by Cyanobacteria. The results of the study suggest that oxygenic photosynthesis performed by Cyanobacteria is the main carbon fixation pathway in the microbial community, supported by carbon isotopic ratios of specific biomarkers. This finding highlights the important role played by Cyanobacteria in this ecosystem.

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Geochemical evidence for arsenic cycling in living microbialites of a High Altitude Andean Lake (Laguna Diamante, Argentina)

Abstract: María Sancho-Tomás (a),*, Andréa Somogyi (b), Kadda Medjoubi (b), Antoine Bergamaschi (b), Pieter T. Visscher (c and d), Alexander E. S. van Driessche (e), Emmanuelle Gérard (a), María E. Farias (f), Manuel Contreras (g) and Pascal Philippot (a and h) a

Cited by 14 publications

References 63 publications

Assessment of the plasmidome of an extremophilic microbial community from the Diamante Lake, Argentina

Assessment of the plasmidome of an extremophilic microbial community from the Diamante Lake, Argentina

Blooming of a microbial community in an Ediacaran extreme volcanic lake system

Geomicrobiological characterization of the evaporitic ecosystem in the hypersaline lake Laguna Verde (Andean Puna, Northwestern Argentina)

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