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  • 1
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    FISH analysis on samples of the Menez Gwen hydrothermal field (2016)
    PANGAEA
    Details
    Publication Date: 2024-04-13
    Keywords: Alphaproteobacteria, targeted with ALF968 oligonucleotides FISH-probe; Archaea, targed with ARCH915 oligonucleotide FISH-probe; Bacteria, targed with EUB338(I-III) oligonucleotide FISH-probe; Bacteria, targed with the ALV735/ALV735 oligonucleotide FISH-probe; Center for Marine Environmental Sciences; CTD/Rosette; CTD-RO; DEPTH, water; Event label; Gammaproteobacteria, targed with the EPSY549/EPS914 oligonucleotide FISH-probe; Gammaproteobacteria, targed with the SUP05_1241 oligonucleotide FISH-probe; Gammaproteobacteria, targeted with Gam42a oligonucleotide FISH-probe; LATITUDE; LONGITUDE; M82/3; M82/3_716-1; M82/3_718-1; M82/3_726-1; M82/3_727-1; M82/3_729-1; M82/3_736-1; M82/3_743-1; M82/3_750-1; M82/3_756-1; M82/3_761-1; MARUM; Meteor (1986); Prokaryotic cell abundance; Remote operated vehicle; ROV; Sample ID; SAR11
    Type: Dataset
    Format: text/tab-separated-values, 109 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 2
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    Biochemical characterization of vent fluids and the microbial community (2016)
    PANGAEA
    In:  Supplement to: Meier, Dimitri V; Bach, Wolfgang; Girguis, Peter R; Gruber-Vodicka, Harald R; Reeves, Eoghan P; Richter, Michael; Vidoudez, Charles; Amann, Rudolf; Meyerdierks, Anke (2016): Heterotrophic Proteobacteria in the vicinity of diffuse hydrothermal venting. Environmental Microbiology, 18(12), 4348-4368, https://doi.org/10.1111/1462-2920.13304
    Details
    Publication Date: 2024-04-13
    Description: In this study, microbial communities in hydrothermal fluids from four different venting areas (White Flames, Cage Site, Woody and Babylon) within the Menez Gwen hydrothermal field (Mid-Atlantic Ridge) were analyzed. Samples were taken along mixing gradients, including diffuse fluid discharge points, their immediate surroundings, and the buoyant parts of hydrothermal plumes, selected based on visible venting, temperature readings and gas concentrations as indicated by in situ mass spectrometry (ISMS) spectra. High throughput 16S rRNA gene amplicon sequences obtained by Illumina paired-end sequencing using the primer combination Bakt_341F and Bakt_805R were analyzed. Total cell counts were determined and fluorescence in situ hybridization was conducted using probes specific for Archaea and Bacteria as well as for different bacterial subgroups. Additionally, three metagenomes were sequenced (Illumina MiSeq paired-end shotgun), assembled, binned, compared and analyzed for key metabolic pathways. Molecular analyses were combined with geochemical analyses and thermodynamic calculations. The study revealed that close to diffuse venting orifices dominated by chemolithoautotrophic Epsilonproteobacteria, in areas where environmental conditions still supported chemolithoautotrophic processes, microbial communities enriched for versatile heterotrophic Alpha- and Gammaproteobacteria were present. The potential for alkane degradation could be shown for several genera and yet uncultured clades. It was proposed that hotspots of chemolithoautotrophic life support a "belt" of heterotrophic bacteria significantly different from the dominating oligotrophic microbiota of the deep sea.
    Keywords: Center for Marine Environmental Sciences; MARUM
    Type: Dataset
    Format: application/zip, 2 datasets
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 3
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    (Table 1) Main environmental parameters of hydrothermal fields (2016)
    PANGAEA
    Details
    Publication Date: 2024-04-13
    Keywords: Carbon dioxide; Center for Marine Environmental Sciences; Comment; CTD/Rosette; CTD-RO; DEPTH, water; Event label; Filter; Hydrogen; Hydrogen sulfide; LATITUDE; LONGITUDE; M82/3; M82/3_716-1; M82/3_718-1; M82/3_726-1; M82/3_727-1; M82/3_729-1; M82/3_736-1; M82/3_743-1; M82/3_750-1; M82/3_756-1; M82/3_761-1; MARUM; Meteor (1986); Methane; Name; Oxygen; pH; Remote operated vehicle; ROV; Sample code/label; Sample ID; Sulfate; Temperature, water
    Type: Dataset
    Format: text/tab-separated-values, 328 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 4
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    Oxygen minimum zone cryptic sulfur cycling sustained by offshore transport of key sulfur oxidizing bacteria (2018)
    Nature Research
    In:  Nature Communications, 9 (1729).
    Details
    Publication Date: 2021-02-08
    Description: Members of the gammaproteobacterial clade SUP05 couple water column sulfide oxidation to nitrate reduction in sulfidic oxygen minimum zones (OMZs). Their abundance in offshore OMZ waters devoid of detectable sulfide has led to the suggestion that local sulfate reduction fuels SUP05-mediated sulfide oxidation in a so-called “cryptic sulfur cycle”. We examined the distribution and metabolic capacity of SUP05 in Peru Upwelling waters, using a combination of oceanographic, molecular, biogeochemical and single-cell techniques. A single SUP05 species, UThioglobus perditus, was found to be abundant and active in both sulfidic shelf and sulfide-free offshore OMZ waters. Our combined data indicated that mesoscale eddy-driven transport led to the dispersal of UT. perditus and elemental sulfur from the sulfidic shelf waters into the offshore OMZ region. This offshore transport of shelf waters provides an alternative explanation for the abundance and activity of sulfide-oxidizing denitrifying bacteria in sulfide-poor offshore OMZ waters.
    Type: Article , PeerReviewed
    Format: text
    Format: text
    DOI: 10.1038/s41467-018-04041-x
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 5
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    Gene expression and ultrastructure of meso- and thermophilic methanotrophic consortia (2018)
    In:  EPIC3Environmental Microbiology, 20(5), pp. 1651-1666, ISSN: 14622912
    Details
    Publication Date: 2020-02-12
    Description: The sulfate‐dependent, anaerobic oxidation of methane (AOM) is an important sink for methane in marine environments. It is carried out between anaerobic methanotrophic archaea (ANME) and sulfate‐reducing bacteria (SRB) living in syntrophic partnership. In this study, we compared the genomes, gene expression patterns and ultrastructures of three phylogenetically different microbial consortia found in hydrocarbon‐rich environments under different temperature regimes: ANME‐1a/HotSeep‐1 (60°C), ANME‐1a/Seep‐SRB2 (37°C) and ANME‐2c/Seep‐SRB2 (20°C). All three ANME encode a reverse methanogenesis pathway: ANME‐2c encodes all enzymes, while ANME‐1a lacks the gene for N5,N10‐methylene tetrahydromethanopterin reductase (mer) and encodes a methylenetetrahydrofolate reductase (Met). The bacterial partners contain the genes encoding the canonical dissimilatory sulfate reduction pathway. During AOM, all three consortia types highly expressed genes encoding for the formation of flagella or type IV pili and/or c‐type cytochromes, some predicted to be extracellular. ANME‐2c expressed potentially extracellular cytochromes with up to 32 hemes, whereas ANME‐1a and SRB expressed less complex cytochromes (≤ 8 and ≤ 12 heme respectively). The intercellular space of all consortia showed nanowire‐like structures and heme‐rich areas. These features are proposed to enable interspecies electron exchange, hence suggesting that direct electron transfer is a common mechanism to sulfate‐dependent AOM, and that both partners synthesize molecules to enable it.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , peerRev
    Location Call Number Limitation Availability
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    PAPER (OA)
  • 6
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    In situ development of a methanotrophic microbiome in deep-sea sediments (2019)
    NATURE PUBLISHING GROUP
    In:  EPIC3Isme Journal, NATURE PUBLISHING GROUP, 13, pp. 197-213, ISSN: 1751-7362
    Details
    Publication Date: 2020-02-14
    Description: Emission of the greenhouse gas methane from the seabed is globally controlled by marine aerobic and anaerobic methanotrophs gaining energy via methane oxidation. However, the processes involved in the assembly and dynamics of methanotrophic populations in complex natural microbial communities remain unclear. Here we investigated the development of a methanotrophic microbiome following subsurface mud eruptions at Håkon Mosby mud volcano (1250 m water depth). Freshly erupted muds hosted deep-subsurface communities that were dominated by Bathyarchaeota, Atribacteria and Chloroflexi. Methanotrophy was initially limited to a thin surface layer of Methylococcales populations consuming methane aerobically. With increasing distance to the eruptive center, anaerobic methanotrophic archaea, sulfate-reducing Desulfobacterales and thiotrophic Beggiatoaceae developed, and their respective metabolic capabilities dominated the biogeochemical functions of the community. Microbial richness, evenness, and cell numbers of the entire microbial community increased up to tenfold within a few years downstream of the mud flow from the eruptive center. The increasing diversity was accompanied by an up to fourfold increase in sequence abundance of relevant metabolic genes of the anaerobic methanotrophic and thiotrophic guilds. The communities fundamentally changed in their structure and functions as reflected in the metagenome turnover with distance from the eruptive center, and this was reflected in the biogeochemical zonation across the mud volcano caldera. The observed functional succession provides a framework for the response time and recovery of complex methanotrophic communities after disturbances of the deep-sea bed.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev , info:eu-repo/semantics/article
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    PAPER (OA)
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