Organic geochemistry and mineralogy suggest anthropogenic impact in speleothem chemistry from volcanic show caves of the Galapagos

Miller, Ana Z.; Morillo, N. T. Jiménez; Gázquez, Fernando; Palma, Vera; Sauro, Francesco; Pereira, M.F.C.; Rull, F.; Toulkeridis, Theofilos; Caldeira, Ana Teresa; Forti, Paolo; Calaforra, José María

doi:10.1016/j.isci.2022.104556

Cited by 14 publications

(8 citation statements)

References 82 publications

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“…The SOM at lower depths (40–50 cm) was predominantly composed of UACs, Lip, Pol and Pep ( Table 2 ), and with a lower diversity of Py-GC/MS compounds ( Table S3 ). The remarkable and similar abundance of Pol compounds observed in NAF and BAF at 40–50 cm depth ( Table 2 ) may have a microbial origin from extracellular polymeric substances containing abundant compounds derived from sugars, as furanose ( Table S3 ), as recently suggested by Miller et al [ 45 ]. Possibly, the higher relative abundance of Pep compounds in BRA (1.44 g/kg OC) compared to NAF and BAF (0.84 and 0.38, respectively, g/kg OC) ( Table 2 ), may also have a microbial origin due to the stimulation of microorganisms by the release of labile organic compounds by Brachiaria roots [ 73 ].…”

Section: Resultssupporting

confidence: 66%

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Soil Organic Matter Molecular Composition Shifts Driven by Forest Regrowth or Pasture after Slash-and-Burn of Amazon Forest

Leal

Morillo

González‐Pérez

et al. 2023

IJERPH

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Slash-and-burn of Amazon Forest (AF) for pasture establishment has increased the occurrence of AF wildfires. Recent studies emphasize soil organic matter (SOM) molecular composition as a principal driver of post-fire forest regrowth and restoration of AF anti-wildfire ambience. Nevertheless, SOM chemical shifts caused by AF fires and post-fire vegetation are rarely investigated at a molecular level. We employed pyrolysis–gas chromatography–mass spectrometry to reveal molecular changes in SOM (0–10, 40–50 cm depth) of a slash-burn-and-20-month-regrowth AF (BAF) and a 23-year Brachiaria pasture post-AF fire (BRA) site compared to native AF (NAF). In BAF (0–10 cm), increased abundance of unspecific aromatic compounds (UACs), polycyclic aromatic hydrocarbons (PAHs) and lipids (Lip) coupled with a depletion of polysaccharides (Pol) revealed strong lingering effects of fire on SOM. This occurs despite fresh litter deposition on soil, suggesting SOM minimal recovery and toxicity to microorganisms. Accumulation of recalcitrant compounds and slow decomposition of fresh forest material may explain the higher carbon content in BAF (0–5 cm). In BRA, SOM was dominated by Brachiaria contributions. At 40–50 cm, alkyl and hydroaromatic compounds accumulated in BRA, whereas UACs accumulated in BAF. UACs and PAH compounds were abundant in NAF, possibly air-transported from BAF.

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Section: Resultssupporting

confidence: 66%

“…The Py-GC/MS-released compounds and graphical figures were analyzed descriptively and interpreted comparatively (NAF vs. BAF vs. BRA) as commonly performed in the recent literature [ 22 , 43 , 44 , 45 ].…”

Section: Methodsmentioning

confidence: 99%

Soil Organic Matter Molecular Composition Shifts Driven by Forest Regrowth or Pasture after Slash-and-Burn of Amazon Forest

Leal

Morillo

González‐Pérez

et al. 2023

IJERPH

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“…Pseudonocardia, more abundant in 3C-yellow, was also found in lava tubes from the Azores and Galapagos (Miller et al, 2020;Miller et al, 2022) and karstic caves (Lee et al, 2001). Pseudonocardia kongjuensis was isolated from a gold mine cave (Lavoie & Northup, 2005).…”

Section: Bacterial Communities Compositionmentioning

confidence: 99%

“…Saw, 2021) and particularly members of a cave rare biosphere (Hershey & Barton, 2018). Yellow-coloured biofilms are widely distributed across volcanic and limestone caves (Gonzalez- Pimentel et al, 2018;Miller et al, 2022;Porca et al, 2012;Saiz-Jimenez et al, 2011), as well as in Cueva del Viento (Figure 1). Martin-Pozas (Martin-Pozas et al, 2023) reported that there are various types of yellow biofilms in caves worldwide, exhibiting differences in both morphology and bacterial compositions.…”

Section: Bacterial Communities Compositionmentioning

confidence: 99%

Microbiological exploration of the Cueva del Viento lava tube system in Tenerife, Canary Islands

Gutierrez‐Patricio,

Osman,

Gonzalez‐Pimentel

et al. 2024

Environ Microbiol Rep

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Cueva del Viento, located in the Canary Islands, Spain, is the Earth's sixth‐longest lava tube, spanning 18,500 m, and was formed approximately 27,000 years ago. This complex volcanic cave system is characterized by a unique geomorphology, featuring an intricate network of galleries. Despite its geological significance, the geomicrobiology of Cueva del Viento remains largely unexplored. This study employed a combination of culture‐dependent techniques and metabarcoding data analysis to gain a comprehensive understanding of the cave's microbial diversity. The 16S rRNA gene metabarcoding approach revealed that the coloured microbial mats (yellow, red and white) coating the cave walls are dominated by the phyla Actinomycetota, Pseudomonadota and Acidobacteriota. Of particular interest is the high relative abundance of the genus Crossiella, which is involved in urease‐mediated biomineralization processes, along with the presence of genera associated with nitrogen cycling, such as Nitrospira. Culture‐dependent techniques provided insights into the morphological characteristics of the isolated species and their potential metabolic activities, particularly for the strains Streptomyces spp., Paenarthrobacter sp. and Pseudomonas spp. Our findings underscore the potential of Cueva del Viento as an ideal environment for studying microbial diversity and for the isolation and characterization of novel bacterial species of biotechnological interest.

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“…It can be found in the form of silicates, aluminosilicates, and crystalline and amorphous silicon dioxide (e.g., quartz and amorphous silica, respectively). The knowledge of the processes involved in the silica amorphization (transformation of crystalline silica into amorphous silica), dissolution, and precipitation is of great interest for the comprehension of the formation of ancient natural quartz-rich environments (Riquelme et al, 2015;Wray and Sauro, 2017;Sauro et al, 2018;Miller et al, 2022). Microbes are known to be involved in silica mineral dissolution and precipitation although in non-hydrothermal environments, the molecular and biochemical mechanisms are still unclear (Miller et al, 2014;Sauro et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

Insights into the microbial life in silica-rich subterranean environments: microbial communities and ecological interactions in an orthoquartzite cave (Imawarì Yeuta, Auyan Tepui, Venezuela)

et al. 2022

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Microbial communities inhabiting caves in quartz-rich rocks are still underexplored, despite their possible role in the silica cycle. The world’s longest orthoquartzite cave, Imawarì Yeuta, represents a perfect arena for the investigation of the interactions between microorganisms and silica in non-thermal environments due to the presence of extraordinary amounts of amorphous silica speleothems of different kinds. In this work, the microbial diversity of Imawarì Yeuta was dissected by analyzing nineteen samples collected from different locations representative of different silica amorphization phases and types of samples. Specifically, we investigated the major ecological patterns in cave biodiversity, specific taxa enrichment, and the main ecological clusters through co-occurrence network analysis. Water content greatly contributed to the microbial communities’ composition and structures in the cave leading to the sample clustering into three groups DRY, WET, and WATER. Each of these groups was enriched in members of Actinobacteriota, Acidobacteriota, and Gammaproteobacteria, respectively. Alpha diversity analysis showed the highest value of diversity and richness for the WET samples, while the DRY group had the lowest. This was accompanied by the presence of correlation patterns including either orders belonging to various phyla from WET samples or orders belonging to the Actinobacteriota and Firmicutes phyla from DRY group samples. The phylogenetic analysis of the dominant species in WET and DRY samples showed that Acidobacteriota and Actinobacteriota strains were affiliated with uncultured bacteria retrieved from various oligotrophic and silica/quartz-rich environments, not only associated with subterranean sites. Our results suggest that the water content greatly contributes to shaping the microbial diversity within a subterranean quartzite environment. Further, the phylogenetic affiliation between Imawarì Yeuta dominant microbes and reference strains retrieved from both surface and subsurface silica- and/or CO2/CO-rich environments, underlines the selective pressure applied by quartz as rock substrate. Oligotrophy probably in association with the geochemistry of silica/quartz low pH buffering activity and alternative energy sources led to the colonization of specific silica-associated microorganisms. This study provides clues for a better comprehension of the poorly known microbial life in subsurface and surface quartz-dominated environments.

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Organic geochemistry and mineralogy suggest anthropogenic impact in speleothem chemistry from volcanic show caves of the Galapagos

Cited by 14 publications

References 82 publications

Soil Organic Matter Molecular Composition Shifts Driven by Forest Regrowth or Pasture after Slash-and-Burn of Amazon Forest

Soil Organic Matter Molecular Composition Shifts Driven by Forest Regrowth or Pasture after Slash-and-Burn of Amazon Forest

Microbiological exploration of the Cueva del Viento lava tube system in Tenerife, Canary Islands

Insights into the microbial life in silica-rich subterranean environments: microbial communities and ecological interactions in an orthoquartzite cave (Imawarì Yeuta, Auyan Tepui, Venezuela)

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