Tebo Bradley M.

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Tebo
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Bradley M.
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  • Dataset
    Water column data from samples collected on R/V Hugh Sharp cruise HRS1709 in the Chesapeake Bay in August 2017
    (Biological and Chemical Oceanography Data Management Office (BCO-DMO). Contact: bco-dmo-data@whoi.edu, 2021-02-19) Luther, George W. ; Tebo, Bradley M.
    Water column data from samples collected on R/V Hugh Sharp cruise HRS1709 in the Chesapeake Bay in August 2017. For a complete list of measurements, refer to the full dataset description in the supplemental file 'Dataset_description.pdf'. The most current version of this dataset is available at: https://www.bco-dmo.org/dataset/840678
  • Dataset
    CTD data and analyses of bottles from CTD rosette samples collected on R/V Hugh R. Sharp cruise HRS1415 in August 2014
    (Biological and Chemical Oceanography Data Management Office (BCO-DMO). Contact: bco-dmo-data@whoi.edu, 2020-01-14) Luther, George W. ; Tebo, Bradley M.
    CTD data and analyses of bottles from CTD rosette samples collected on cruise HRS1415. For a complete list of measurements, refer to the full dataset description in the supplemental file 'Dataset_description.pdf'. The most current version of this dataset is available at: https://www.bco-dmo.org/dataset/717687
  • Dataset
    Data from in situ pump profiler system collected on R/V Hugh R. Sharp cruise HRS1415 in August 2014
    (Biological and Chemical Oceanography Data Management Office (BCO-DMO). Contact: bco-dmo-data@whoi.edu, 2020-01-10) Luther, George W. ; Tebo, Bradley M.
    Data from in situ pump profiler system collected on R/V Hugh R. Sharp cruise HRS1415 in August 2014 For a complete list of measurements, refer to the full dataset description in the supplemental file 'Dataset_description.pdf'. The most current version of this dataset is available at: https://www.bco-dmo.org/dataset/718887
  • Dataset
    Event Log from R/V Hugh R. Sharp cruise HRS1415 in the Chesapeake Bay and coastal Atlantic Ocean in August 2014
    (Biological and Chemical Oceanography Data Management Office (BCO-DMO). Contact: bco-dmo-data@whoi.edu, 2020-01-10) Luther, George W. ; Tebo, Bradley M.
    Event Log from R/V Hugh R. Sharp cruise HRS1415 in the Chesapeake Bay and coastal Atlantic Ocean in August 2014 For a complete list of measurements, refer to the full dataset description in the supplemental file 'Dataset_description.pdf'. The most current version of this dataset is available at: https://www.bco-dmo.org/dataset/717994
  • Dataset
    Water column data from samples collected on R/V Hugh Sharp cruise HRS1803GL in the Chesapeake Bay during July-August 2018
    (Biological and Chemical Oceanography Data Management Office (BCO-DMO). Contact: bco-dmo-data@whoi.edu, 2021-06-11) Luther, George W. ; Tebo, Bradley M.
    Water column data from samples collected on R/V Hugh Sharp cruise HRS1803GL in the Chesapeake Bay during July-August 2018. Samples were collected by CTD and from an in situ pump profiler system attached to the CTD rosette. For a complete list of measurements, refer to the full dataset description in the supplemental file 'Dataset_description.pdf'. The most current version of this dataset is available at: https://www.bco-dmo.org/dataset/853038
  • Dataset
    Porewater H2S from a multi-core sample taken on R/V Hugh Sharp cruise HRS1709 in the Chesapeake Bay in August 2017
    (Biological and Chemical Oceanography Data Management Office (BCO-DMO). Contact: bco-dmo-data@whoi.edu, 2021-02-19) Luther, George W. ; Tebo, Bradley M.
    Porewater H2S from a multi-core sample taken on R/V Hugh Sharp cruise HRS1709 in the Chesapeake Bay in August 2017. For a complete list of measurements, refer to the full dataset description in the supplemental file 'Dataset_description.pdf'. The most current version of this dataset is available at: https://www.bco-dmo.org/dataset/840754
  • Article
    Vailulu'u Seamount, Samoa : life and death on an active submarine volcano
    (National Academy of Sciences, 2006-04-13) Staudigel, Hubert ; Hart, Stanley R. ; Pile, Adele ; Bailey, Bradley E. ; Baker, Edward T. ; Brooke, Sandra ; Connelly, Douglas P. ; Haucke, Lisa ; German, Christopher R. ; Hudson, Ian ; Jones, Daniel O. B. ; Koppers, Anthony A. P. ; Konter, Jasper G. ; Lee, Ray ; Pietsch, Theodore W. ; Tebo, Bradley M. ; Templeton, Alexis S. ; Zierenberg, Robert ; Young, Craig M.
    Submersible exploration of the Samoan hotspot revealed a new, 300-m-tall, volcanic cone, named Nafanua, in the summit crater of Vailulu'u seamount. Nafanua grew from the 1,000-m-deep crater floor in <4 years and could reach the sea surface within decades. Vents fill Vailulu'u crater with a thick suspension of particulates and apparently toxic fluids that mix with seawater entering from the crater breaches. Low-temperature vents form Fe oxide chimneys in many locations and up to 1-m-thick layers of hydrothermal Fe floc on Nafanua. High-temperature (81°C) hydrothermal vents in the northern moat (945-m water depth) produce acidic fluids (pH 2.7) with rising droplets of (probably) liquid CO2. The Nafanua summit vent area is inhabited by a thriving population of eels (Dysommina rugosa) that feed on midwater shrimp probably concentrated by anticyclonic currents at the volcano summit and rim. The moat and crater floor around the new volcano are littered with dead metazoans that apparently died from exposure to hydrothermal emissions. Acid-tolerant polychaetes (Polynoidae) live in this environment, apparently feeding on bacteria from decaying fish carcasses. Vailulu'u is an unpredictable and very active underwater volcano presenting a potential long-term volcanic hazard. Although eels thrive in hydrothermal vents at the summit of Nafanua, venting elsewhere in the crater causes mass mortality. Paradoxically, the same anticyclonic currents that deliver food to the eels may also concentrate a wide variety of nektonic animals in a death trap of toxic hydrothermal fluids.
  • Article
    Ultra-diffuse hydrothermal venting supports Fe-oxidizing bacteria and massive umber deposition at 5000 m off Hawaii
    (Nature Publishing Group, 2011-05-05) Edwards, Katrina J. ; Glazer, Brian T. ; Rouxel, Olivier J. ; Bach, Wolfgang ; Emerson, David ; Toner, Brandy M. ; Chan, Clara S. ; Tebo, Bradley M. ; Staudigel, Hubert ; Moyer, Craig L.
    A novel hydrothermal field has been discovered at the base of Lōihi Seamount, Hawaii, at 5000 mbsl. Geochemical analyses demonstrate that ‘FeMO Deep’, while only 0.2 °C above ambient seawater temperature, derives from a distal, ultra-diffuse hydrothermal source. FeMO Deep is expressed as regional seafloor seepage of gelatinous iron- and silica-rich deposits, pooling between and over basalt pillows, in places over a meter thick. The system is capped by mm to cm thick hydrothermally derived iron-oxyhydroxide- and manganese-oxide-layered crusts. We use molecular analyses (16S rDNA-based) of extant communities combined with fluorescent in situ hybridizations to demonstrate that FeMO Deep deposits contain living iron-oxidizing Zetaproteobacteria related to the recently isolated strain Mariprofundus ferroxydans. Bioenergetic calculations, based on in-situ electrochemical measurements and cell counts, indicate that reactions between iron and oxygen are important in supporting chemosynthesis in the mats, which we infer forms a trophic base of the mat ecosystem. We suggest that the biogenic FeMO Deep hydrothermal deposit represents a modern analog for one class of geological iron deposits known as ‘umbers’ (for example, Troodos ophilolites, Cyprus) because of striking similarities in size, setting and internal structures.
  • Article
    Oxidative formation and removal of complexed Mn(III) by Pseudomonas species
    (Frontiers Media, 2018-04-12) Wright, Mitchell H. ; Geszvain, Kati ; Oldham, Véronique E. ; Luther, George W. ; Tebo, Bradley M.
    The observation of significant concentrations of soluble Mn(III) complexes in oxic, suboxic, and some anoxic waters has triggered a re-evaluation of the previous Mn paradigm which focused on the cycling between soluble Mn(II) and insoluble Mn(III,IV) species as operationally defined by filtration. Though Mn(II) oxidation in aquatic environments is primarily bacterially-mediated, little is known about the effect of Mn(III)-binding ligands on Mn(II) oxidation nor on the formation and removal of Mn(III). Pseudomonas putida GB-1 is one of the most extensively investigated of all Mn(II) oxidizing bacteria, encoding genes for three Mn oxidases (McoA, MnxG, and MopA). P. putida GB-1 and associated Mn oxidase mutants were tested alongside environmental isolates Pseudomonas hunanensis GSL-007 and Pseudomonas sp. GSL-010 for their ability to both directly oxidize weakly and strongly bound Mn(III), and to form these complexes through the oxidation of Mn(II). Using Mn(III)-citrate (weak complex) and Mn(III)-DFOB (strong complex), it was observed that P. putida GB-1, P. hunanensis GSL-007 and Pseudomonas sp. GSL-010 and mutants expressing only MnxG and McoA were able to directly oxidize both species at varying levels; however, no oxidation was detected in cultures of a P. putida mutant expressing only MopA. During cultivation in the presence of Mn(II) and citrate or DFOB, P. putida GB-1, P. hunanensis GSL-007 and Pseudomonas sp. GSL-010 formed Mn(III) complexes transiently as an intermediate before forming Mn(III/IV) oxides with the overall rates and extents of Mn(III,IV) oxide formation being greater for Mn(III)-citrate than for Mn(III)-DFOB. These data highlight the role of bacteria in the oxidative portion of the Mn cycle and suggest that the oxidation of strong Mn(III) complexes can occur through enzymatic mechanisms involving multicopper oxidases. The results support the observations from field studies and further emphasize the complexity of the geochemical cycling of manganese.