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  • 1
    Online Resource
    Online Resource
    Methyl sulfides as intermediates in the anaerobic oxidation of methane
    Wiley ; 2008
    In:  Environmental Microbiology Vol. 10, No. 1 ( 2008-01), p. 162-173
    Details
    In: Environmental Microbiology, Wiley, Vol. 10, No. 1 ( 2008-01), p. 162-173
    Abstract: While it is clear that microbial consortia containing Archaea and sulfate‐reducing bacteria (SRB) can mediate the anaerobic oxidation of methane (AOM), the interplay between these microorganisms remains unknown. The leading explanation of the AOM metabolism is ‘reverse methanogenesis’ by which a methanogenesis substrate is produced and transferred between species. Conceptually, the reversal of methanogenesis requires low H 2 concentrations for energetic favourability. We used 13 C‐labelled CH 4 as a tracer to test the effects of elevated H 2 pressures on incubations of active AOM sediments from both the Eel River basin and Hydrate Ridge. In the presence of H 2 , we observed a minimal reduction in the rate of CH 4 oxidation, and conclude H 2 does not play an interspecies role in AOM. Based on these results, as well as previous work, we propose a new model for substrate transfer in AOM. In this model, methyl sulfides produced by the Archaea from both CH 4 oxidation and CO 2 reduction are transferred to the SRB. Metabolically, CH 4 oxidation provides electrons for the energy‐yielding reduction of CO 2 to a methyl group (‘methylogenesis’). Methylogenesis is a dominantly reductive pathway utilizing most methanogenesis enzymes in their forward direction. Incubations of seep sediments demonstrate, as would be expected from this model, that methanethiol inhibits AOM and that CO can be substituted for CH 4 as the electron donor for methylogenesis.
    Type of Medium: Online Resource
    ISSN: 1462-2912 , 1462-2920
    URL: Issue
    URL: Article
    DOI: 10.1111/emi.2008.10.issue-1
    DOI: 10.1111/j.1462-2920.2007.01441.x
    Language: English
    Publisher: Wiley
    Publication Date: 2008
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  • 2
    Online Resource
    Online Resource
    Manganese- and Iron-Dependent Marine Methane Oxidation
    American Association for the Advancement of Science (AAAS) ; 2009
    In:  Science Vol. 325, No. 5937 ( 2009-07-10), p. 184-187
    Details
    In: Science, American Association for the Advancement of Science (AAAS), Vol. 325, No. 5937 ( 2009-07-10), p. 184-187
    Abstract: Anaerobic methanotrophs help regulate Earth’s climate and may have been an important part of the microbial ecosystem on the early Earth. The anaerobic oxidation of methane (AOM) is often thought of as a sulfate-dependent process, despite the fact that other electron acceptors are more energetically favorable. Here, we show that microorganisms from marine methane-seep sediment in the Eel River Basin in California are capable of using manganese (birnessite) and iron (ferrihydrite) to oxidize methane, revealing that marine AOM is coupled, either directly or indirectly, to a larger variety of oxidants than previously thought. Large amounts of manganese and iron are provided to oceans from rivers, indicating that manganese- and iron-dependent AOM have the potential to be globally important.
    Type of Medium: Online Resource
    ISSN: 0036-8075 , 1095-9203
    URL: Article
    DOI: 10.1126/science.1169984
    RVK:
    TA 1000
    RVK:
    WA 15000
    Language: English
    Publisher: American Association for the Advancement of Science (AAAS)
    Publication Date: 2009
    detail.hit.zdb_id: 128410-1
    detail.hit.zdb_id: 2066996-3
    detail.hit.zdb_id: 2060783-0
    SSG: 11
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  • 3
    Online Resource
    Online Resource
    The effect of sulfate concentration on (sub)millimeter-scale sulfide δ34S in hypersaline cyanobacterial mats over the diurnal cycle
    Elsevier BV ; 2009
    In:  Geochimica et Cosmochimica Acta Vol. 73, No. 20 ( 2009-10), p. 6187-6204
    Details
    In: Geochimica et Cosmochimica Acta, Elsevier BV, Vol. 73, No. 20 ( 2009-10), p. 6187-6204
    Type of Medium: Online Resource
    ISSN: 0016-7037
    URL: Article
    DOI: 10.1016/j.gca.2009.07.006
    RVK:
    TE 1000
    Language: English
    Publisher: Elsevier BV
    Publication Date: 2009
    detail.hit.zdb_id: 300305-X
    detail.hit.zdb_id: 1483679-8
    SSG: 13
    SSG: 16,12
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  • 4
    Online Resource
    Online Resource
    Planktonic and Sediment-Associated Aerobic Methanotrophs in Two Seep Systems along the North American Margin
    American Society for Microbiology ; 2008
    In:  Applied and Environmental Microbiology Vol. 74, No. 13 ( 2008-07), p. 3985-3995
    Details
    In: Applied and Environmental Microbiology, American Society for Microbiology, Vol. 74, No. 13 ( 2008-07), p. 3985-3995
    Abstract: Methane vents are of significant geochemical and ecological importance. Notable progress has been made toward understanding anaerobic methane oxidation in marine sediments; however, the diversity and distribution of aerobic methanotrophs in the water column are poorly characterized. Both environments play an essential role in regulating methane release from the oceans to the atmosphere. In this study, the diversity of particulate methane monooxygenase ( pmoA ) and 16S rRNA genes from two methane vent environments along the California continental margin was characterized. The pmoA phylotypes recovered from methane-rich sediments and the overlying water column differed. Sediments harbored the greatest number of unique pmoA phylotypes broadly affiliated with the Methylococcaceae family, whereas planktonic pmoA phylotypes formed three clades that were distinct from the sediment-hosted methanotrophs and distantly related to established methanotrophic clades. Water column-associated phylotypes were highly similar between field sites, suggesting that planktonic methanotroph diversity is controlled primarily by environmental factors rather than geographical proximity. Analysis of 16S rRNA genes from methane-rich waters did not readily recover known methanotrophic lineages, with only a few phylotypes demonstrating distant relatedness to Methylococcus . The development of new pmo primers increased the recovery of monooxygenase genes from the water column and led to the discovery of a highly diverged monooxygenase sequence which is phylogenetically intermediate to Amo and pMMO. This sequence potentiates insight into the amo/pmo superfamily. Together, these findings lend perspective into the diversity and segregation of aerobic methanotrophs within different methane-rich habitats in the marine environment.
    Type of Medium: Online Resource
    ISSN: 0099-2240 , 1098-5336
    URL: Article
    DOI: 10.1128/AEM.00069-08
    RVK:
    WA 15000
    Language: English
    Publisher: American Society for Microbiology
    Publication Date: 2008
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    detail.hit.zdb_id: 1478346-0
    SSG: 12
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  • 5
    Online Resource
    Online Resource
    Variations in Archaeal and Bacterial Diversity Associated with the Sulfate-Methane Transition Zone in Continental Margin Sediments (Santa Barbara Basin, California)
    American Society for Microbiology ; 2009
    In:  Applied and Environmental Microbiology Vol. 75, No. 6 ( 2009-03-15), p. 1487-1499
    Details
    In: Applied and Environmental Microbiology, American Society for Microbiology, Vol. 75, No. 6 ( 2009-03-15), p. 1487-1499
    Abstract: The sulfate-methane transition zone (SMTZ) is a widespread feature of continental margins, representing a diffusion-controlled interface where there is enhanced microbial activity. SMTZ microbial activity is commonly associated with the anaerobic oxidation of methane (AOM), which is carried out by syntrophic associations between sulfate-reducing bacteria and methane-oxidizing archaea. While our understanding of the microorganisms catalyzing AOM has advanced, the diversity and ecological role of the greater microbial assemblage associated with the SMTZ have not been well characterized. In this study, the microbial diversity above, within, and beneath the Santa Barbara Basin SMTZ was described. ANME-1-related archaeal phylotypes appear to be the primary methane oxidizers in the Santa Barbara Basin SMTZ, which was independently supported by exclusive recovery of related methyl coenzyme M reductase genes ( mcrA ). Sulfate-reducing Deltaproteobacteria phylotypes affiliated with the Desulfobacterales and Desulfosarcina-Desulfococcus clades were also enriched in the SMTZ, as confirmed by analysis of dissimilatory sulfite reductase ( dsr ) gene diversity. Statistical methods demonstrated that there was a close relationship between the microbial assemblages recovered from the two horizons associated with the geochemically defined SMTZ, which could be distinguished from microbial diversity recovered from the sulfate-replete overlying horizons and methane-rich sediment beneath the transition zone. Comparison of the Santa Barbara Basin SMTZ microbial assemblage to microbial assemblages of methane seeps and other organic matter-rich sedimentary environments suggests that bacterial groups not typically associated with AOM, such as Planctomycetes and candidate division JS1, are additionally enriched within the SMTZ and may represent a common bacterial signature of many SMTZ environments worldwide.
    Type of Medium: Online Resource
    ISSN: 0099-2240 , 1098-5336
    URL: Article
    DOI: 10.1128/AEM.01812-08
    RVK:
    WA 15000
    Language: English
    Publisher: American Society for Microbiology
    Publication Date: 2009
    detail.hit.zdb_id: 223011-2
    detail.hit.zdb_id: 1478346-0
    SSG: 12
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  • 6
    Online Resource
    Online Resource
    Authigenic carbonate formation at hydrocarbon seeps in continental margin sediments: A comparative study
    Elsevier BV ; 2007
    In:  Deep Sea Research Part II: Topical Studies in Oceanography Vol. 54, No. 11-13 ( 2007-6), p. 1268-1291
    Details
    In: Deep Sea Research Part II: Topical Studies in Oceanography, Elsevier BV, Vol. 54, No. 11-13 ( 2007-6), p. 1268-1291
    Type of Medium: Online Resource
    ISSN: 0967-0645
    URL: Article
    DOI: 10.1016/j.dsr2.2007.04.010
    Language: English
    Publisher: Elsevier BV
    Publication Date: 2007
    detail.hit.zdb_id: 1141627-0
    detail.hit.zdb_id: 1500312-7
    SSG: 14
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  • 7
    Online Resource
    Online Resource
    Extensive carbon isotopic heterogeneity among methane seep microbiota
    Wiley ; 2009
    In:  Environmental Microbiology Vol. 11, No. 9 ( 2009-09), p. 2207-2215
    Details
    In: Environmental Microbiology, Wiley, Vol. 11, No. 9 ( 2009-09), p. 2207-2215
    Abstract: To assess and study the heterogeneity of δ 13 C values for seep microorganisms of the Eel River Basin, we studied two principally different sample sets: sediments from push cores and artificial surfaces colonized over a 14 month in situ incubation. In a single sediment core, the δ 13 C compositions of methane seep‐associated microorganisms were measured and the relative activity of several metabolisms was determined using radiotracers. We observed a large range of archaeal δ 13 C values ( 〉  50‰) in this microbial community. The δ 13 C of ANME‐1 rods ranged from −24‰ to −87‰. The δ 13 C of ANME‐2 sarcina ranged from −18‰ to −75‰. Initial measurements of shell aggregates were as heavy as −19.5‰ with none observed to be lighter than −57‰. Subsequent measurements on shell aggregates trended lighter reaching values as 13 C‐depleted as −73‰. The observed isotopic trends found for mixed aggregates were similar to those found for shell aggregates in that the initial measurements were often enriched and the subsequent analyses were more 13 C‐depleted (with values as light as −56‰). The isotopic heterogeneity and trends observed within taxonomic groups suggest that ANME‐1 and ANME‐2 sarcina are capable of both methanogenesis and methanotrophy. In situ microbial growth was investigated by incubating a series of slides and silicon (Si) wafers for 14 months in seep sediment. The experiment showed ubiquitous growth of bacterial filaments (mean δ 13 C = −38 ± 3‰), suggesting that this bacterial morphotype was capable of rapid colonization and growth.
    Type of Medium: Online Resource
    ISSN: 1462-2912 , 1462-2920
    URL: Issue
    URL: Article
    DOI: 10.1111/emi.2009.11.issue-9
    DOI: 10.1111/j.1462-2920.2009.01934.x
    Language: English
    Publisher: Wiley
    Publication Date: 2009
    detail.hit.zdb_id: 2020213-1
    SSG: 12
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  • 8
    Online Resource
    Online Resource
    Evolutionary innovation: a bone-eating marine symbiosis
    Wiley ; 2005
    In:  Environmental Microbiology Vol. 7, No. 9 ( 2005-09), p. 1369-1378
    Details
    In: Environmental Microbiology, Wiley, Vol. 7, No. 9 ( 2005-09), p. 1369-1378
    Type of Medium: Online Resource
    ISSN: 1462-2912 , 1462-2920
    URL: Issue
    URL: Article
    DOI: 10.1111/emi.2005.7.issue-9
    DOI: 10.1111/j.1462-2920.2005.00824.x
    Language: English
    Publisher: Wiley
    Publication Date: 2005
    detail.hit.zdb_id: 2020213-1
    SSG: 12
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  • 9
    Online Resource
    Online Resource
    Patterns of 15 N assimilation and growth of methanotrophic ANME‐2 archaea and sulfate‐reducing bacteria within structured syntrophic consortia revealed by FISH‐SIMS
    Wiley ; 2009
    In:  Environmental Microbiology Vol. 11, No. 7 ( 2009-07), p. 1777-1791
    Details
    In: Environmental Microbiology, Wiley, Vol. 11, No. 7 ( 2009-07), p. 1777-1791
    Abstract: Methane release from the oceans is controlled in large part by syntrophic interactions between anaerobic methanotrophic archaea (ANME) and sulfate‐reducing bacteria (DSS), frequently found as organized consortia. An understanding of the specifics of this symbiotic relationship and the metabolic heterogeneity existing between and within individual methane‐oxidizing aggregates is currently lacking. Here, we use the microanalytical method FISH‐SIMS (fluorescence in situ hybridization‐secondary ion mass spectrometry) to describe the physiological traits and anabolic activity of individual methanotrophic consortia, specifically tracking 15 N‐labelled protein synthesis to examine the effects of organization and size on the metabolic activity of the syntrophic partners. Patterns of 15 N distribution within individual aggregates showed enhanced 15 N assimilation in ANME‐2 cells relative to the co‐associated DSS revealing a decoupling in anabolic activity between the partners. Protein synthesis in ANME‐2 cells was sustained throughout the core of individual ANME‐2/DSS consortia ranging in size range from 4 to 20 μm. This indicates that metabolic activity of the methane‐oxidizing archaea is not limited to, or noticeably enhanced at the ANME−2/DSS boundary. Overall, the metabolic activity of both syntrophic partners within consortia was greater than activity measured in representatives of the ANME‐2 and DSS observed alone, with smaller ANME‐2/DSS aggregates displaying a tendency for greater 15 N uptake and doubling times ranging from 3 to 5 months. The combination of 15 N‐labelling and FISH‐SIMS provides an important perspective on the extent of heterogeneity within methanotrophic aggregates and may aid in constraining predictive models of activity and growth by these syntrophic consortia.
    Type of Medium: Online Resource
    ISSN: 1462-2912 , 1462-2920
    URL: Issue
    URL: Article
    DOI: 10.1111/emi.2009.11.issue-7
    DOI: 10.1111/j.1462-2920.2009.01903.x
    Language: English
    Publisher: Wiley
    Publication Date: 2009
    detail.hit.zdb_id: 2020213-1
    SSG: 12
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  • 10
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    Online Resource
    Temporal evolution of methane cycling and phylogenetic diversity of archaea in sediments from a deep-sea whale-fall in Monterey Canyon, California
    Springer Science and Business Media LLC ; 2008
    In:  The ISME Journal Vol. 2, No. 2 ( 2008-2), p. 204-220
    Details
    In: The ISME Journal, Springer Science and Business Media LLC, Vol. 2, No. 2 ( 2008-2), p. 204-220
    Type of Medium: Online Resource
    ISSN: 1751-7362 , 1751-7370
    URL: Article
    DOI: 10.1038/ismej.2007.103
    Language: English
    Publisher: Springer Science and Business Media LLC
    Publication Date: 2008
    detail.hit.zdb_id: 2299378-2
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