Microbial diversity in deep-sea sediments from the Menez Gwen hydrothermal vent system of the Mid-Atlantic Ridge

Cerqueira, T.; Pinho, Diogo; Egas, Conceição; Froufe, Hugo J.C.; Altermark, Bjørn; Candeias, Carla; Santos, Ricardo S.; Bettencourt, Raúl

doi:10.1016/j.margen.2015.09.001

Cited by 31 publications

(24 citation statements)

References 67 publications

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“…Gammaproteobacteria has been widely detected in deep-sea environments [18,37,40–43], and Epsilonproteobacteria was reported to occur in the hydrothermal systems of Mid-Atlantic Ridge, Mariana Arc seamounts, and Okinawa Trough [44–46]. In our study, the presence of the genera Sulfurovum , Sulfurimonas , Arcobacter , and Sulfurospirillum within Epsilonproteobacteria suggested that these members potentially participated in sulfur oxidization and reduction as well as nitrate reduction.…”

Section: Discussionsupporting

confidence: 50%

A comparative study revealed first insights into the diversity and metabolisms of the microbial communities in the sediments of Pacmanus and Desmos hydrothermal fields

et al. 2017

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Currently, little is known about the microbial diversity in the sediments of Pacmanus and Desmos hydrothermal fields in Manus Basin. In this study, Illumina-based sequencing of 16S rRNA gene amplicons and metagenomic analysis were conducted to investigate the microbial populations and metabolic profiles in the sediments from four different regions in Pacmanus and Desmos hydrothermal fields. It was found that Gammaproteobacteria and Thaumarchaeota were the most abundant bacterial and archaeal populations, respectively. The autotrophic prokaryotes in the four communities probably fixed CO2 via four major pathways, i.e. Calvin-Benson-Bassham cycle, reductive acetyl-CoA cycle, rTCA cycle, and 3-hydroxypropionate/4-hydroxybutyrate cycle. Ammonia-oxidizing Thaumarchaeota, nitrifiers, denitrifiers, and sulfur oxidizers belonging to the subgroups of Proteobacteria (e.g., alpha, beta, gamma, and epsilon), Nitrospira, and Nitrospina, and sulfate-reducing Desulfobacterales likely played critical roles in nitrogen and sulfur cycling, in which ammonia, sulfur compounds, and hydrogen could be utilized as potential energy sources. These findings revealed new insights into the operational mechanism of the microbial communities associated with Pacmanus and Desmos hydrothermal fields.

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Section: Discussionsupporting

confidence: 50%

A comparative study revealed first insights into the diversity and metabolisms of the microbial communities in the sediments of Pacmanus and Desmos hydrothermal fields

et al. 2017

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“…C2 also exhibited a quite constant diversity and richness in all pore water units except for PW IV. The diversity of this submarine permafrost site is thereby comparable with the permafrost active layer and permafrost thaw ponds [ Liebner et al, ; Crevecoeur et al, ], though lower than in marine and deep‐sea hydrothermal sediments [ Wang et al, ; Cerqueira et al, ]. Recalling the clear stratification of bacterial assemblages according to the degree of marine influence, C2 displays thus a very unusual subseafloor habitat where permafrost table depth, stage of permafrost degradation, and time of inundation are constraints for the abundance and structure of bacteria and where permafrost is a bottom‐up source for subseafloor life.…”

Section: Discussionmentioning

confidence: 84%

The development of permafrost bacterial communities under submarine conditions

Mitzscherling

Winkel

Winterfeld

et al. 2017

J. Geophys. Res. Biogeosci.

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Submarine permafrost is more vulnerable to thawing than permafrost on land. Besides increased heat transfer from the ocean water, the penetration of salt lowers the freezing temperature and accelerates permafrost degradation. Microbial communities in thawing permafrost are expected to be stimulated by warming, but how they develop under submarine conditions is completely unknown. We used the unique records of two submarine permafrost cores from the Laptev Sea on the East Siberian Arctic Shelf, inundated about 540 and 2500 years ago, to trace how bacterial communities develop depending on duration of the marine influence and pore water chemistry. Combined with geochemical analysis, we quantified total cell numbers and bacterial gene copies and determined the community structure of bacteria using deep sequencing of the bacterial 16S rRNA gene. We show that submarine permafrost is an extreme habitat for microbial life deep below the seafloor with changing thermal and chemical conditions. Pore water chemistry revealed different pore water units reflecting the degree of marine influence and stages of permafrost thaw. Millennia after inundation by seawater, bacteria stratify into communities in permafrost, marine‐affected permafrost, and seabed sediments. In contrast to pore water chemistry, the development of bacterial community structure, diversity, and abundance in submarine permafrost appears site specific, showing that both sedimentation and permafrost thaw histories strongly affect bacteria. Finally, highest microbial abundance was observed in the ice‐bonded seawater unaffected but warmed permafrost of the longer inundated core, suggesting that permafrost bacterial communities exposed to submarine conditions start to proliferate millennia after warming.

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“…This has led to re-exploration of well-known microbial processes as the nitrogen cycle 44 , methane metabolism 45 , sulfur cycle 46 , heavy metal remediation and petroleum bioremediation 47 along with examination of exotic and extreme environments such as deep-sea hydrothermal vents 48 , cold deserts like Antarctica 49 and remote cave systems 50 . As a result, a large body of work has accumulated over the years on the microbiological study of hydrocarbon degradation using NGS technologies 51 .…”

Section: Discussionmentioning

confidence: 99%

Bioinformatic Approaches Including Predictive Metagenomic Profiling Reveal Characteristics of Bacterial Response to Petroleum Hydrocarbon Contamination in Diverse Environments

Mukherjee

Chettri

Langpoklakpam

et al. 2017

Sci Rep

121

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Microbial remediation of oil polluted habitats remains one of the foremost methods for restoration of petroleum hydrocarbon contaminated environments. The development of effective bioremediation strategies however, require an extensive understanding of the resident microbiome of these habitats. Recent developments such as high-throughput sequencing has greatly facilitated the advancement of microbial ecological studies in oil polluted habitats. However, effective interpretation of biological characteristics from these large datasets remain a considerable challenge. In this study, we have implemented recently developed bioinformatic tools for analyzing 65 16S rRNA datasets from 12 diverse hydrocarbon polluted habitats to decipher metagenomic characteristics of the resident bacterial communities. Using metagenomes predicted from 16S rRNA gene sequences through PICRUSt, we have comprehensively described phylogenetic and functional compositions of these habitats and additionally inferred a multitude of metagenomic features including 255 taxa and 414 functional modules which can be used as biomarkers for effective distinction between the 12 oil polluted sites. Additionally, we show that significantly over-represented taxa often contribute to either or both, hydrocarbon degradation and additional important functions. Our findings reveal significant differences between hydrocarbon contaminated sites and establishes the importance of endemic factors in addition to petroleum hydrocarbons as driving factors for sculpting hydrocarbon contaminated bacteriomes.

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Microbial diversity in deep-sea sediments from the Menez Gwen hydrothermal vent system of the Mid-Atlantic Ridge

Cited by 31 publications

References 67 publications

A comparative study revealed first insights into the diversity and metabolisms of the microbial communities in the sediments of Pacmanus and Desmos hydrothermal fields

A comparative study revealed first insights into the diversity and metabolisms of the microbial communities in the sediments of Pacmanus and Desmos hydrothermal fields

The development of permafrost bacterial communities under submarine conditions

Bioinformatic Approaches Including Predictive Metagenomic Profiling Reveal Characteristics of Bacterial Response to Petroleum Hydrocarbon Contamination in Diverse Environments

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