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  • 2010-2014  (4)
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  • 1
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    Impact of natural oil and higher hydrocarbons on microbial diversity, distribution, and activity in Gulf of Mexico cold-seep sediments (2010)
    Elsevier
    In:  Deep Sea Research Part II: Topical Studies in Oceanography, 57 (21-23). pp. 2008-2021.
    Details
    Publication Date: 2020-08-05
    Description: Gulf of Mexico cold seeps characterized by variable compositions and magnitudes of hydrocarbon seepage were sampled in order to investigate the effects of natural oils, methane, and non-methane hydrocarbons on microbial activity, diversity, and distribution in seafloor sediments. Though some sediments were characterized by relatively high quantities of oil, which may be toxic to some microorganisms, high rates of sulfate reduction (SR, 27.9714.7 mmol m2 d1), anaerobic oxidation of methane (AOM, 16.276.7 mmol m2 d1), and acetate oxidation (2.7470.76 mmol m2 d1) were observed in radiotracer measurements. In many instances, the SR rate was higher than the AOM rate, indicating that non-methane hydrocarbons fueled SR. Analysis of 16S rRNA gene clone libraries revealed phylogenetically diverse communities that were dominated by phylotypes of sulfate-reducing bacteria (SRB) and anaerobic methanotrophs of the ANME-1 and ANME-2 varieties. Another group of archaea form a Gulf of Mexico-specific clade (GOM ARC2) that may be important in brine-influenced, oil-impacted sediments from deeper water. Additionally, species grouping within the uncultivated Deltaproteobacteria clades SEEP-SRB3 and -SRB4, as well as relatives of Desulfobacterium anilini, were observed in relatively higher abundance in the oil-impacted sediments, suggesting that these groups of SRB may be involved in or influenced by degradation of higher hydrocarbons or petroleum byproducts.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1016/j.dsr2.2010.05.014
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 2
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    Archaeal and bacterial diversity at different sites as determined by 16S rRNA gene analysis (2013)
    PANGAEA
    Details
    Publication Date: 2024-04-18
    Keywords: Acidobacteria, relative 16S rRNA clone frequency; Actinobacteria, relative 16S rRNA clone frequency; alpha-Proteobacteria, relative 16S rRNA clone frequency; Anaerobic methanotrophic archaea-2-a-2b, relative 16S rRNA clone frequency; Anaerobic methanotrophic archaea-2c, relative 16S rRNA clone frequency; Anaerobic methanotrophic archaea-3, relative 16S rRNA clone frequency; ANT06-05 archaea, relative 16S rRNA clone frequency; Bacteria, unaffiliated, relative 16S rRNA clone frequency; Bacteroidetes, relative 16S rRNA clone frequency; beta-Proteobacteria, relative 16S rRNA clone frequency; CCA47 archaea, relative 16S rRNA clone frequency; Chloroflexi, relative 16S rRNA clone frequency; Deep Sea Euryarchaeal Group, relative 16S rRNA clone frequency; Delta-Proteobacteria, relative 16S rRNA clone frequency; Depth, bottom/max; DEPTH, sediment/rock; Depth, top/min; East of New Zealand, Omakere Ridge; East of New Zealand, Wairarapa Takahae; Epsilon-Proteobacteria, relative 16S rRNA clone frequency; Event label; Fibrobacteres, relative 16S rRNA clone frequency; Gammaproteobacteria, relative 16S rRNA clone frequency; Habitat; Marine Benthic Group A, relative 16S rRNA clone frequency; Marine Benthic Group B, relative 16S rRNA clone frequency; Marine Benthic Group D, relative 16S rRNA clone frequency; Marine Benthic Group E, relative 16S rRNA clone frequency; Marine group I, relative 16S rRNA clone frequency; Methanimicrococcus, relative 16S rRNA clone frequency; Methanococcoides, relative 16S rRNA clone frequency; Methanosalsum, relative 16S rRNA clone frequency; Miscellaneous Crenarchaeotic Group, relative 16S rRNA clone frequency; Multicorer with television; NEW VENTS; Nitrospira, relative 16S rRNA clone frequency; Number of clones; PCR using ARCH20Fb (Massana et al., 1997) and Uni1292R (Lane et al., 1985) prime; PCR using GM3/GM4 primer (Muyzer et al., 1993); Planctomycetes, relative 16S rRNA clone frequency; SO191/2; SO191/2_045; SO191/2_078; SO191/3; SO191/3_309-2; SO191/3_315; Sonne; Thermoplasmatales, relative 16S rRNA clone frequency; TVMUC
    Type: Dataset
    Format: text/tab-separated-values, 93 data points
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    DATA PANGAEA
  • 3
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    Microbial communities of deep-sea methane seeps at Hikurangi continental margin (New Zealand). (2013)
    PUBLIC LIBRARY SCIENCE
    In:  EPIC3PLoS ONE, PUBLIC LIBRARY SCIENCE, 8(9), pp. e72627, ISSN: 1932-6203
    Details
    Publication Date: 2014-09-17
    Description: The methane-emitting cold seeps of Hikurangi margin (New Zealand) are among the few deep-sea chemosynthetic ecosystems of the Southern Hemisphere known to date. Here we compared the biogeochemistry and microbial communities of a variety of Hikurangi cold seep ecosystems. These included highly reduced seep habitats dominated by bacterial mats, partially oxidized habitats populated by heterotrophic ampharetid polychaetes and deeply oxidized habitats dominated by chemosynthetic frenulate tubeworms. The ampharetid habitats were characterized by a thick oxic sediment layer that hosted a diverse and biomass-rich community of aerobic methanotrophic Gammaproteobacteria. These bacteria consumed up to 25% of the emanating methane and clustered within three deep-branching groups named Marine Methylotrophic Group (MMG) 1-3. MMG1 and MMG2 methylotrophs belong to the order Methylococcales, whereas MMG3 methylotrophs are related to the Methylophaga. Organisms of the groups MMG1 and MMG3 are close relatives of chemosynthetic endosymbionts of marine invertebrates. The anoxic sediment layers of all investigated seeps were dominated by anaerobic methanotrophic archaea (ANME) of the ANME-2 clade and sulfate-reducing Deltaproteobacteria. Microbial community analysis using Automated Ribosomal Intergenic Spacer Analysis (ARISA) showed that the different seep habitats hosted distinct microbial communities, which were strongly influenced by the seep-associated fauna and the geographic location. Despite outstanding features of Hikurangi seep communities, the organisms responsible for key ecosystem functions were similar to those found at seeps worldwide. This suggests that similar types of biogeochemical settings select for similar community composition regardless of geographic distance. Because ampharetid polychaetes are widespread at cold seeps the role of aerobic methanotrophy may have been underestimated in seafloor methane budgets.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
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    PAPER (OA)
  • 4
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    Indications for algae-degrading benthic microbial communities in deep-sea sediments along the Antarctic Polar Front (2014)
    Elsevier
    In:  EPIC3Deep Sea Research Part II: Topical Studies in Oceanography, Elsevier, 108, pp. 6-16, ISSN: 0967-0645
    Details
    Publication Date: 2014-11-11
    Description: Phytoplankton blooms in surface waters of the oceans are known to influence the food web and impact microbial as well as zooplankton communities. Numerous studies have investigated the fate of phytoplankton-derived organic matter in surface waters and shelf sediments, however, little is known about the effect of sinking algal biomass on microbial communities in deep-sea sediments. Here, we analyzed sediments of four regions in the Southern Atlantic Ocean along the Antarctic Polar Front that had different exposures to phytoplankton bloom derived organic matter. We investigated the microbial communities in these sediments using high-throughput sequencing of 16S rRNA molecules to determine microorganisms that were active and catalyzed reporter deposition fluorescence in situ hybridization to infer their abundance and distribution. The sediments along the Antarctic Polar Front harbored microbial communities that were highly diverse and contained microbial clades that seem to preferably occur in regions of high primary productivity. We showed that organisms affiliated with the gammaproteobacterial clade NOR5/OM60, which is known from surface waters and coastal sediments, thrive in the deep-sea. Benthic deep-sea NOR5 were abundant, diverse, distinct from pelagic NOR5 and likely specialized on the degradation of phytoplankton-derived organic matter, occupying a similar niche as their pelagic relatives. Algal detritus seemed to not only fuel the benthic microbial communities of large areas in the deep-sea, but also to influence communities locally, as we found a peak in Flavobacteriaceae-related clades that also include degraders of algal biomass. The results strongly suggest that phytoplankton-derived organic matter was rapidly exported to the deep-sea, nourished distinct benthic microbial communities and seemed to be the main energy source for microbial life in the seafloor of vast abyssal regions along the Antarctic Polar Front.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
    Format: application/pdf
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    PAPER (OA)
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