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  • 1
    Online Resource
    Online Resource
    Table_1.XLSX
    Frontiers Media SA ; 2022
    In:  Frontiers in Marine Science Vol. 8 ( 2022-2-3)
    Details
    In: Frontiers in Marine Science, Frontiers Media SA, Vol. 8 ( 2022-2-3)
    Abstract: The abyssal ocean covers more than half of the Earth’s surface, yet remains understudied and underappreciated. In this Perspectives article, we mark the occasion of the Deep Submergence Vehicle Alvin’s increased depth range (from 4500 to 6500 m) to highlight the scientific potential of the abyssal seafloor. From a geologic perspective, ultra-slow spreading mid-ocean ridges, Petit Spot volcanism, transform faults, and subduction zones put the full life cycle of oceanic crust on display in the abyss, revealing constructive and destructive forces over wide ranges in time and space. Geochemically, the abyssal pressure regime influences the solubility of constituents such as silica and carbonate, and extremely high-temperature fluid-rock reactions in the shallow subsurface lead to distinctive and potentially unique geochemical profiles. Microbial residents range from low-abundance, low-energy communities on the abyssal plains to fast growing thermophiles at hydrothermal vents. Given its spatial extent and position as an intermediate zone between coastal and deep hadal settings, the abyss represents a lynchpin in global-scale processes such as nutrient and energy flux, population structure, and biogeographic diversity. Taken together, the abyssal ocean contributes critical ecosystem services while facing acute and diffuse anthropogenic threats from deep-sea mining, pollution, and climate change.
    Type of Medium: Online Resource
    ISSN: 2296-7745
    URL: Article
    URL: Article
    DOI: 10.3389/fmars.2021.798943
    DOI: 10.3389/fmars.2021.798943.s001
    Language: Unknown
    Publisher: Frontiers Media SA
    Publication Date: 2022
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  • 2
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    Mineralogy Drives Bacterial Biogeography of Hydrothermally Inactive Seafloor Sulfide Deposits
    Informa UK Limited ; 2013
    In:  Geomicrobiology Journal Vol. 30, No. 4 ( 2013-02), p. 313-326
    Details
    In: Geomicrobiology Journal, Informa UK Limited, Vol. 30, No. 4 ( 2013-02), p. 313-326
    Type of Medium: Online Resource
    ISSN: 0149-0451 , 1521-0529
    URL: Article
    DOI: 10.1080/01490451.2012.688925
    Language: English
    Publisher: Informa UK Limited
    Publication Date: 2013
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  • 3
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    Methane Seep Carbonates Host Distinct, Diverse, and Dynamic Microbial Assemblages
    American Society for Microbiology ; 2015
    In:  mBio Vol. 6, No. 6 ( 2015-12-31)
    Details
    In: mBio, American Society for Microbiology, Vol. 6, No. 6 ( 2015-12-31)
    Abstract: Since their discovery in 1984, the global distribution and importance of marine methane seeps have become increasingly clear. Much of our understanding of methane seep microorganisms—from metabolisms to community ecology—has stemmed from detailed studies of seep sediments. However, it has become apparent that carbonates represent a volumetrically significant habitat substrate at methane seeps. Through combined in situ characterization and incubation experiments, this study demonstrates that carbonates host microbial assemblages distinct from and more diverse than those of other seep habitats. This emphasizes the importance of seep carbonates as biodiversity locales. Furthermore, we demonstrate that carbonate-associated microbial assemblages are well adapted to withstand fluctuations in methane seepage, and we gain novel insight into particular taxa that are responsive (or recalcitrant) to changes in seep conditions.
    Type of Medium: Online Resource
    ISSN: 2161-2129 , 2150-7511
    URL: Article
    DOI: 10.1128/mBio.01348-15
    Language: English
    Publisher: American Society for Microbiology
    Publication Date: 2015
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  • 4
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    Monodeuterated Methane, an Isotopic Tool To Assess Biological Methane Metabolism Rates
    American Society for Microbiology ; 2017
    In:  mSphere Vol. 2, No. 4 ( 2017-08-30)
    Details
    In: mSphere, American Society for Microbiology, Vol. 2, No. 4 ( 2017-08-30)
    Abstract: Biological methane oxidation is a globally relevant process that mediates the flux of an important greenhouse gas through both aerobic and anaerobic metabolic pathways. However, measuring these metabolic rates presents many obstacles, from logistical barriers to regulatory hurdles and poor precision. Here we present a new approach for investigating microbial methane metabolism based on hydrogen atom dynamics, which is complementary to carbon-focused assessments of methanotrophy. The method uses monodeuterated methane (CH 3 D) as a metabolic substrate, quantifying the aqueous D/H ratio over time using off-axis integrated cavity output spectroscopy. This approach represents a nontoxic, comparatively rapid, and straightforward approach that supplements existing radiotopic and stable carbon isotopic methods; by probing hydrogen atoms, it offers an additional dimension for examining rates and pathways of methane metabolism. We provide direct comparisons between the CH 3 D procedure and the well-established 14 CH 4 radiotracer method for several methanotrophic systems, including type I and II aerobic methanotroph cultures and methane-seep sediment slurries and carbonate rocks under anoxic and oxic incubation conditions. In all applications tested, methane consumption values calculated via the CH 3 D method were directly and consistently proportional to 14 C radiolabel-derived methane oxidation rates. We also employed this method in a nontraditional experimental setup, using flexible, gas-impermeable bags to investigate the role of pressure on seep sediment methane oxidation rates. Results revealed an 80% increase over atmospheric pressure in methanotrophic rates the equivalent of ~900-m water depth, highlighting the importance of this parameter on methane metabolism and exhibiting the flexibility of the newly described method. IMPORTANCE Microbial methane consumption is a critical component of the global carbon cycle, with wide-ranging implications for climate regulation and hydrocarbon exploitation. Nonetheless, quantifying methane metabolism typically involves logistically challenging methods and/or specialized equipment; these impediments have limited our understanding of methane fluxes and reservoirs in natural systems, making effective management difficult. Here, we offer an easily implementable, precise method using monodeuterated methane (CH 3 D) that advances three specific aims. First, it allows users to directly compare methane consumption rates between different experimental treatments of the same inoculum. Second, by empirically linking the CH 3 D procedure with the well-established 14 C radiocarbon approach, we determine absolute scaling factors that facilitate rate measurements for several aerobic and anaerobic systems of interest. Third, CH 3 D represents a helpful tool in evaluating the relationship between methane activation and full oxidation in methanotrophic metabolisms. The procedural advantages, consistency, and novel research questions enabled by the CH 3 D method should prove useful in a wide range of culture-based and environmental microbial systems to further elucidate methane metabolism dynamics.
    Type of Medium: Online Resource
    ISSN: 2379-5042
    URL: Article
    DOI: 10.1128/mSphereDirect.00309-17
    Language: English
    Publisher: American Society for Microbiology
    Publication Date: 2017
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  • 5
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    Archaea in metazoan diets: implications for food webs and biogeochemical cycling
    Springer Science and Business Media LLC ; 2012
    In:  The ISME Journal Vol. 6, No. 8 ( 2012-8), p. 1602-1612
    Details
    In: The ISME Journal, Springer Science and Business Media LLC, Vol. 6, No. 8 ( 2012-8), p. 1602-1612
    Type of Medium: Online Resource
    ISSN: 1751-7362 , 1751-7370
    URL: Article
    DOI: 10.1038/ismej.2012.16
    Language: English
    Publisher: Springer Science and Business Media LLC
    Publication Date: 2012
    detail.hit.zdb_id: 2299378-2
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  • 6
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    Iron oxides stimulate sulfate-driven anaerobic methane oxidation in seeps
    Proceedings of the National Academy of Sciences ; 2014
    In:  Proceedings of the National Academy of Sciences Vol. 111, No. 40 ( 2014-10-07)
    Details
    In: Proceedings of the National Academy of Sciences, Proceedings of the National Academy of Sciences, Vol. 111, No. 40 ( 2014-10-07)
    Abstract: Seep sediments are dominated by intensive microbial sulfate reduction coupled to the anaerobic oxidation of methane (AOM). Through geochemical measurements of incubation experiments with methane seep sediments collected from Hydrate Ridge, we provide insight into the role of iron oxides in sulfate-driven AOM. Seep sediments incubated with 13 C-labeled methane showed co-occurring sulfate reduction, AOM, and methanogenesis. The isotope fractionation factors for sulfur and oxygen isotopes in sulfate were about 40‰ and 22‰, respectively, reinforcing the difference between microbial sulfate reduction in methane seeps versus other sedimentary environments (for example, sulfur isotope fractionation above 60‰ in sulfate reduction coupled to organic carbon oxidation or in diffusive sedimentary sulfate–methane transition zone). The addition of hematite to these microcosm experiments resulted in significant microbial iron reduction as well as enhancing sulfate-driven AOM. The magnitude of the isotope fractionation of sulfur and oxygen isotopes in sulfate from these incubations was lowered by about 50%, indicating the involvement of iron oxides during sulfate reduction in methane seeps. The similar relative change between the oxygen versus sulfur isotopes of sulfate in all experiments (with and without hematite addition) suggests that oxidized forms of iron, naturally present in the sediment incubations, were involved in sulfate reduction, with hematite addition increasing the sulfate recycling or the activity of sulfur-cycling microorganisms by about 40%. These results highlight a role for natural iron oxides during bacterial sulfate reduction in methane seeps not only as nutrient but also as stimulator of sulfur recycling.
    Type of Medium: Online Resource
    ISSN: 0027-8424 , 1091-6490
    URL: Article
    DOI: 10.1073/pnas.1412269111
    RVK:
    TA 1000
    RVK:
    WA 15000
    Language: English
    Publisher: Proceedings of the National Academy of Sciences
    Publication Date: 2014
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  • 7
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    The Potential for Biologically Catalyzed Anaerobic Methane Oxidation on Ancient Mars
    Mary Ann Liebert Inc ; 2014
    In:  Astrobiology Vol. 14, No. 4 ( 2014-04), p. 292-307
    Details
    In: Astrobiology, Mary Ann Liebert Inc, Vol. 14, No. 4 ( 2014-04), p. 292-307
    Type of Medium: Online Resource
    ISSN: 1531-1074 , 1557-8070
    URL: Article
    DOI: 10.1089/ast.2013.1078
    Language: English
    Publisher: Mary Ann Liebert Inc
    Publication Date: 2014
    detail.hit.zdb_id: 2047736-3
    SSG: 12
    SSG: 16,12
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  • 8
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    Periglacial landforms at the Phoenix landing site and the northern plains of Mars
    American Geophysical Union (AGU) ; 2008
    In:  Journal of Geophysical Research Vol. 113 ( 2008-11-05)
    Details
    In: Journal of Geophysical Research, American Geophysical Union (AGU), Vol. 113 ( 2008-11-05)
    Type of Medium: Online Resource
    ISSN: 0148-0227
    URL: Article
    DOI: 10.1029/2007JE003039
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 2008
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    detail.hit.zdb_id: 2016813-5
    detail.hit.zdb_id: 2016810-X
    detail.hit.zdb_id: 2403298-0
    detail.hit.zdb_id: 2016800-7
    detail.hit.zdb_id: 161666-3
    detail.hit.zdb_id: 161667-5
    detail.hit.zdb_id: 2969341-X
    detail.hit.zdb_id: 161665-1
    detail.hit.zdb_id: 3094268-8
    detail.hit.zdb_id: 710256-2
    detail.hit.zdb_id: 2016804-4
    detail.hit.zdb_id: 3094181-7
    detail.hit.zdb_id: 3094219-6
    detail.hit.zdb_id: 3094167-2
    detail.hit.zdb_id: 2220777-6
    detail.hit.zdb_id: 3094197-0
    SSG: 16,13
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  • 9
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    Carbonate-hosted methanotrophy represents an unrecognized methane sink in the deep sea
    Springer Science and Business Media LLC ; 2014
    In:  Nature Communications Vol. 5, No. 1 ( 2014-10-14)
    Details
    In: Nature Communications, Springer Science and Business Media LLC, Vol. 5, No. 1 ( 2014-10-14)
    Type of Medium: Online Resource
    ISSN: 2041-1723
    URL: Article
    DOI: 10.1038/ncomms6094
    Language: English
    Publisher: Springer Science and Business Media LLC
    Publication Date: 2014
    detail.hit.zdb_id: 2553671-0
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  • 10
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    Impacts of deep‐sea mining on microbial ecosystem services
    Wiley ; 2020
    In:  Limnology and Oceanography Vol. 65, No. 7 ( 2020-07), p. 1489-1510
    Details
    In: Limnology and Oceanography, Wiley, Vol. 65, No. 7 ( 2020-07), p. 1489-1510
    Abstract: Interest in extracting mineral resources from the seafloor through deep‐sea mining has accelerated in the past decade, driven by consumer demand for various metals like zinc, cobalt, and rare earth elements. While there are ongoing studies evaluating potential environmental impacts of deep‐sea mining activities, these focus primarily on impacts to animal biodiversity. The microscopic spectrum of seafloor life and the services that this life provides in the deep sea are rarely considered explicitly. In April 2018, scientists met to define the microbial ecosystem services that should be considered when assessing potential impacts of deep‐sea mining, and to provide recommendations for how to evaluate and safeguard these services. Here, we indicate that the potential impacts of mining on microbial ecosystem services in the deep sea vary substantially, from minimal expected impact to loss of services that cannot be remedied by protected area offsets. For example, we (1) describe potential major losses of microbial ecosystem services at active hydrothermal vent habitats impacted by mining, (2) speculate that there could be major ecosystem service degradation at inactive massive sulfide deposits without extensive mitigation efforts, (3) suggest minor impacts to carbon sequestration within manganese nodule fields coupled with potentially important impacts to primary production capacity, and (4) surmise that assessment of impacts to microbial ecosystem services at seamounts with ferromanganese crusts is too poorly understood to be definitive. We conclude by recommending that baseline assessments of microbial diversity, biomass, and, importantly, biogeochemical function need to be considered in environmental impact assessments of deep‐sea mining.
    Type of Medium: Online Resource
    ISSN: 0024-3590 , 1939-5590
    URL: Issue
    URL: Article
    DOI: 10.1002/lno.v65.7
    DOI: 10.1002/lno.11403
    Language: English
    Publisher: Wiley
    Publication Date: 2020
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    SSG: 12
    SSG: 14
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