Microbial Diversity of Deep-Sea Ferromanganese Crust Field in the Rio Grande Rise, Southwestern Atlantic Ocean

Bergo, Natascha Menezes; Bendia, Amanda Gonçalves; Ferreira, Juliana Correa Neiva; Murton, Bramley J.; Brandini, Frederico Pereira; Pellizari, Vivian H.

doi:10.1007/s00248-020-01670-y

Cited by 35 publications

(34 citation statements)

References 49 publications

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“…In addition, Candidatus Nitrosopumilus and unassigned Thermoplasmata from the Marine Group II were detected in great abundance (Figure 5). Those taxa have been previously detected in marine basalts and deep seawater circulation through oceanic crust (Mason et al, 2007;Singer et al, 2015;Suzuki et al, 2020;Bergo et al, 2021). Although the deep ocean is typically enriched in archaeal cells, other marine environments usually show a dominance of bacterial lineages (Karner et al, 2001).…”

Section: Putative Inhabitants Of the Subsurfacementioning

confidence: 92%

Basalt-Hosted Microbial Communities in the Subsurface of the Young Volcanic Island of Surtsey, Iceland

et al. 2021

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The island of Surtsey was formed in 1963–1967 on the offshore Icelandic volcanic rift zone. It offers a unique opportunity to study the subsurface biosphere in newly formed oceanic crust and an associated hydrothermal-seawater system, whose maximum temperature is currently above 120°C at about 100m below surface. Here, we present new insights into the diversity, distribution, and abundance of microorganisms in the subsurface of the island, 50years after its creation. Samples, including basaltic tuff drill cores and associated fluids acquired at successive depths as well as surface fumes from fumaroles, were collected during expedition 5059 of the International Continental Scientific Drilling Program specifically designed to collect microbiological samples. Results of this microbial survey are investigated with 16S rRNA gene amplicon sequencing and scanning electron microscopy. To distinguish endemic microbial taxa of subsurface rocks from potential contaminants present in the drilling fluid, we use both methodological and computational strategies. Our 16S rRNA gene analysis results expose diverse and distinct microbial communities in the drill cores and the borehole fluid samples, which harbor thermophiles in high abundance. Whereas some taxonomic lineages detected across these habitats remain uncharacterized (e.g., Acetothermiia, Ammonifexales), our results highlight potential residents of the subsurface that could be identified at lower taxonomic rank such as Thermaerobacter, BRH-c8a (Desulfallas-Sporotomaculum), Thioalkalimicrobium, and Sulfurospirillum. Microscopy images reveal possible biotic structures attached to the basaltic substrate. Finally, microbial colonization of the newly formed basaltic crust and the metabolic potential are discussed on the basis of the data.

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Section: Putative Inhabitants Of the Subsurfacementioning

confidence: 92%

Basalt-Hosted Microbial Communities in the Subsurface of the Young Volcanic Island of Surtsey, Iceland

et al. 2021

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“…Unexpectedly, the SAR11 clade was detected only in the RGR seamount. Closely related sequences of SAR11 were reported previously in sediments across the São Paulo Plateau (Queiroz et al ., 2020) and crusts from RGR (Bergo et al ., 2021). SAR11 includes carbon-oxidizing bacteria with multiple depth-specific ecotypes (Cameron et al ., 2014; Giovannoni et al ., 2017).…”

Section: Discussionmentioning

confidence: 99%

“…Recently, we demonstrated a large proportion of unknown species and hidden functions in the RGR seafloor microbiome (Bergo et al ., 2021). In fact, the indicator taxa for sediments in both RGR and Tropic seamount reveals an unknown deep-sea environment influenced by unclassified and uncultured groups.…”

Section: Discussionmentioning

confidence: 99%

“…Besides, microorganisms are essential contributors to marine biogeochemical cycles and possibly supply high productivity found in seamounts (Morato et al ., 2010; Rowden et al ., 2010; Leitner et al ., 2020). Bacteria and Archaea have been studied in the deep ocean, where they are diverse and possibly supply the energy flow in the Pacific and Atlantic seamounts (Fullerton et al ., 2017; Liu et al ., 2019; Orcutt et al ., 2020; Bergo et al ., 2021).…”

Section: Introductionmentioning

confidence: 99%

“…Deep-sea mining operations will disturb or erode the seafloor and create near-bottom sediment plumes (Miller et al ., 2018), consequently affecting micro- and macrobenthic life. Despite all the studies that have been conducted since Fe-Mn deposits were discovered in the 1870s (Murray, 1891), little is known about the microbial diversity of seamount environments (Molari et al ., 2020), especially in the Atlantic Ocean (Bergo et al ., 2021). Most efforts to study Atlantic seamounts with Fe-Mn deposits have been to assess mineral resources and their megafaunal community (Perez et al ., 2018; Yeo et al ., 2018; Montserrat et al ., 2019; Ramiro-Sánchez et al ., 2019; Benites et al ., 2020).…”

Section: Introductionmentioning

confidence: 99%

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Spatial Patterns of Microbial Diversity, Composition and Community Structure in Fe-Mn Deposits and Associated Sediments in the Atlantic and Pacific Oceans

Bergo

Torres-Ballesteros

Signori

et al. 2022

Preprint

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Mining of deep-sea Fe-Mn deposits will remove crusts and nodules in large areas from the seafloor. The growth of a few millimeters of these minerals by Fe and Mn oxides precipitation takes millions of years, and yet little is known about their microbiome. Besides being key elements of the biogeochemical cycles and essential links of food and energy to deep-sea trophic webs, microbes have been identified to affect manganese oxide formation. Hence, polymetallic crusts and nodules may present unique habitats that deserve better understanding. In this study, we determined the composition and diversity of Bacteria and Archaea in deep-sea Fe-Mn crusts, nodules, and associated sediments from two oceanic elevations in the Atlantic Ocean, the Tropic Seamount in the northeast and the Rio Grande Rise (RGR) in the southwest. Sequencing of the 16S rRNA gene was performed using the Illumina MiSeq platform and statistical analyses using environmental data were performed in R. Additionally, we included public domain environmental DNA data of Fe-Mn crusts, nodules, and associated sediments from Clarion-Clipperton Zone and Takuyo-Daigo Seamount in the Pacific Ocean to compare microbial diversity in Fe-Mn deposits from different ocean basins. Our results indicated that Atlantic seamounts harbor an unusual and unknown Fe-Mn deposit microbiome with lower diversity and richness compared to deposits from Pacific areas. Crusts and nodules from Atlantic seamounts revealed the presence of unique taxa (Alteromonadales, Nitrospira, and Magnetospiraceae) and a higher relative abundance of sequences related to potential metal-cycling bacteria, such as Betaproteobacteriales and Pseudomonadales. The microbial beta-diversity from Atlantic seamounts was clearly grouped into microhabitats according to crusts, nodules, and sediments geochemical composition. Furthermore, community structure analysis using principal coordinate analysis also showed that the microbial communities of all seamounts were significantly divided into ocean basins and sampling areas. Despite the time scale of million years for these deposits to grow, a combination of environmental settings (temperature, salinity, depth, substrate geochemistry, nutrient, and organic matter availability) played a significant role in shaping the crusts and nodules microbiome, which was distinct between the Atlantic and Pacific Fe-Mn deposits. Our results suggest that the microbial community inhabiting Fe-Mn deposits participate in biogeochemical reactions indispensable to deep-sea ecosystems, which implies that understanding the microbial community is of utmost importance for any baseline environmental study in areas of potential deep-sea mining.

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Tracing the Century‐Long Evolution of Microplastics Deposition in a Cold Seep

Feng

Tang

et al. 2023

Advanced Science

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Microplastic (MP) pollution is one of the greatest threats to marine ecosystems. Cold seeps are characterized by methane-rich fluid seepage fueling one of the richest ecosystems on the seafloor, and there are approximately more than 900 cold seeps globally. While the long-term evolution of MPs in cold seeps remains unclear. Here, how MPs have been deposited in the Haima cold seep since the invention of plastics is demonstrated. It is found that the burial rates of MPs in the non-seepage areas significantly increased since the massive global use of plastics in the 1930s, nevertheless, the burial rates and abundance of MPs in the methane seepage areas are much lower than the non-seepage area of the cold seep, suggesting the degradation potential of MPs in cold seeps. More MP-degrading microorganism populations and functional genes are discovered in methane seepage areas to support this discovery. It is further investigated that the upwelling fluid seepage facilitated the fragmentation and degradation behaviors of MPs. Risk assessment indicated that long-term transport and transformation of MPs in the deeper sediments can reduce the potential environmental and ecological risks. The findings illuminated the need to determine fundamental strategies for sustainable marine plastic pollution mitigation in the natural deep-sea environments.

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Microbial Diversity of Deep-Sea Ferromanganese Crust Field in the Rio Grande Rise, Southwestern Atlantic Ocean

Cited by 35 publications

References 49 publications

Basalt-Hosted Microbial Communities in the Subsurface of the Young Volcanic Island of Surtsey, Iceland

Basalt-Hosted Microbial Communities in the Subsurface of the Young Volcanic Island of Surtsey, Iceland

Spatial Patterns of Microbial Diversity, Composition and Community Structure in Fe-Mn Deposits and Associated Sediments in the Atlantic and Pacific Oceans

Tracing the Century‐Long Evolution of Microplastics Deposition in a Cold Seep

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