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  • 1
    Electronic Resource
    Electronic Resource
    Evidence for complete denitrification in a benthic foraminifer (2006)
    [s.l.] : Nature Publishing Group
    Nature 443 (2006), S. 93-96 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Benthic foraminifera are unicellular eukaryotes found abundantly in many types of marine sediments. Many species survive and possibly reproduce in anoxic habitats, but sustainable anaerobic metabolism has not been previously described. Here we demonstrate that the foraminifer Globobulimina ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/nature05070
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Nitrification–denitrification dynamics and community structure of ammonia oxidizing bacteria in a high yield irrigated Philippine rice field (2004)
    Oxford, UK : Blackwell Publishing Ltd
    FEMS microbiology ecology 49 (2004), S. 0 
    Details
    ISSN: 1574-6941
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Nitrogen is the single most limiting factor for rice production. Detailed knowledge on nitrogen dynamics in rice fields is therefore of major importance for developing sustainable rice production. A combination of state-of-the-art microsensor, stable isotope tracer, and molecular techniques was used to evaluate coupled nitrification–denitrification potentials and community structure of ammonia-oxidizing bacteria in a high yield irrigated rice cropping system in the Philippines, without the use of microcosm incubations. The multiple approaches showed a high degree of concordance among methods and thereby clarified the investigated processes. Numbers and potential activity of ammonia-oxidizing bacteria in the system reflected the availability of substrate in three defined soil factions with a ranking of: surface soil 〉 rhizosphere 〉 bulk soil. No nitrification activity was measured between spit applications of N fertilizer. However, nitrification was induced upon nitrogen amendment in intact soil cores. Despite induction by nitrogen amendment, the loss of nitrogen through coupled nitrification–denitrification was less than 10% of the plant nitrogen uptake. Denaturant gradient gel electrophoresis of amoA fragments revealed no differences in diversity profiles between the soil fractions, and phylogenetic analysis, based on amoA genes retrieved from the rice paddy soil, identified a set of mutually very similar sequences related to Nitrosomonas nitrosa.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/j.femsec.2004.04.015
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Nitrification, denitrification, and nitrate ammonification in sediments of two coastal lagoons in Southern France (1996)
    Springer
    Hydrobiologia 329 (1996), S. 133-141 
    Details
    ISSN: 1573-5117
    Keywords: Nitrification ; denitrification ; nitrate ; ammonification ; sediments ; isotope ; 15N ; ammonium ; flux
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Seasonal and diurnal variations in sediment-water fluxes of O2, NO 3 − , and NH 4 + as well as rates of nitrification, denitrification, and nitrate ammonification were determined in two different coastal lagoons of southern France: The seagrass (Zostera noltii) dominated tidal Bassin d'Arcachon and the dystrophic Etang du Prévost. Overall, denitrification rates in both Bassin d'Arcachon (〈0.4 mmol m−2 d−1) and Etang du Prévost (〈1 mmol m−2 d−1) were low. This was mainly caused by a combination of low NO 3 − concentrations in the water column and a low nitrification activity within the sediment. In both Bassin d'Arcachon and Etang du Prévost, rates of nitrate ammonification were quantitatively as important as denitrification. Denitrification played a minor role as a nitrogen sink in both systems. In the tidal influenced Bassin d'Arcachon, Z. noltii was quantitatively more important than denitrification as a nitrogen sink due to the high assimilation rates of the plants. Throughout the year, Z. noltii stabilized the mudflats of the bay by its well- developed root matrix and controlled the nitrogen cycle due to its high uptake rates. In contrast, the lack of rooted macrophytes, and dominance of floating macroalgae, made nitrogen cycling in Etang du Prévost more unstable and unpredictable. Inhibition of nitrification and denitrification during the dystrophic crisis in the summer time increased the inorganic nitrogen flux from the sediment to the water column and thus increased the degree of benthic-pelagic coupling within this bay. During winter, however, benthic microalgae colonizing the sediment surface changed the sediment in the lagoon from being a nitrogen source to the over lying water to being a sink due to their high assimilation rates. It is likely, however, that this assimilated nitrogen is liberated to the water column at the onset of summer thereby fueling the extensive growth of the floating macroalgae, Ulva sp. The combination of a high nitrogen coupling between sediment and water column, little water exchange and low denitrification rates resulted in an unstable system with fast growing algal species such as phytoplankton and floating algae.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00034553
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    Paper (German National Licenses)
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  • 4
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    (Table S1) Stable carbon isotope composition of dissolved inorganic carbon and Ion activity product of dolomite of IODP Exp 323 sites (2011)
    PANGAEA
    In:  Supplement to: Wehrmann, Laura Mariana; Risgaard-Petersen, Nils; Schrum, Heather N; Walsh, Emily A; Huh, Youngsook; Ikehara, Minoru; Pierre, Catherine; d'Hondt, Steven L; Ferdelman, Timothy G; Ravelo, Ana Christina; Takahashi, Kozo; Zarikian, Carlos Alvarez (2011): Coupled organic and inorganic carbon cycling in the deep subseafloor sediment of the northeastern Bering Sea Slope (IODP Exp. 323). Chemical Geology, 284(3-4), 251-261, https://doi.org/10.1016/j.chemgeo.2011.03.002
    Details
    Publication Date: 2024-01-06
    Description: We studied microbially mediated diagenetic processes driven by carbon mineralization in subseafloor sediment of the northeastern Bering Sea Slope to a depth of 745 meters below seafloor (mbsf). Sites U1343, U1344 and U1345 were drilled during Integrated Ocean Drilling Program (IODP) Expedition 323 at water depths of 1008 to 3172 m. They are situated in the high productivity “Green Belt” region, with organic carbon burial rates typical of the high-productivity upwelling domains on western continental margins. The three sites show strong geochemical similarities. The downward sequence of microbially mediated processes in the sediment encompasses (1) organoclastic sulfate reduction, (2) anaerobic oxidation of methane (AOM) coupled to sulfate reduction, and (3) methanogenesis. The sediment contains two distinct zones of diagenetic carbonate formation, located at the sulfate–methane transition zone (SMTZ) and between 300 and 400 mbsf. The SMTZ at the three sites is located between 6 and 9 mbsf. The upward methane fluxes into the SMTZ are similar to fluxes in SMTZs underlying high-productivity surface waters off Chile and Namibia. Our Bering Sea results show that intense organic carbon mineralization drives high ammonium and dissolved inorganic carbon (DIC) production rates (〉 4.2 mmol/m**3/y1) in the uppermost 10 mbsf and strongly imprints on the stable carbon isotope composition of DIC, driving it to a minimum value of -27 per mil (VPDB) at the SMTZ. Pore-water calcium and magnesium profiles demonstrate formation of diagenetic Mg-rich calcite in the SMTZ. Below the SMTZ, methanogenesis results in 13C-enrichment of pore-water DIC, with a maximum value of +11.9 per mil. The imprint of methanogenesis on the DIC carbon isotope composition is evident down to a depth of 150 mbsf. Below this depth, slow or absent microbially mediated carbon mineralization leaves DIC isotope composition unaffected. Ongoing carbonate formation between 300 and 400 mbsf strongly influences pore-water DIC and magnesium concentration profiles. The linked succession of organic carbon mineralization and carbonate dissolution and precipitation patterns that we observe in the Bering Sea Slope sediment may be representative of passive continental margin settings in high-productivity areas of the world's ocean.
    Keywords: 323-U1343; 323-U1344; 323-U1345; Bering Sea; Bering Sea Paleoceanography; Calculated (Moore et al. 2004); COMPCORE; Composite Core; DEPTH, sediment/rock; Event label; Exp323; Integrated Ocean Drilling Program / International Ocean Discovery Program; IODP; Ion activity product, Log; Joides Resolution; Mass spectrometer Thermo Electron Delta plus IRMS; δ13C, dissolved inorganic carbon
    Type: Dataset
    Format: text/tab-separated-values, 508 data points
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  • 5
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    Raw data of summer hydrographic conditions at proglacial fjord entrances along East Greenland during HDMS Knud Rasmussen expedition KN_2021 in August 2021 (2024)
    PANGAEA
    Details
    Publication Date: 2024-04-20
    Description: Here we present results from a synoptic survey of the pan‐east Greenland coastal system from the entrance of fjords at Cape Farewell (59°N) to Kaiser Franz Josef Fjord (73°N). Using conductivity‐temperature‐depth (CTD) profiles and water isotopes (δ18O, δ2H) sampling, we aim to describe the spatial distribution of water masses and source water fractions along east Greenland and their link to proglacial fjords. This is a hydrographic dataset containing CTD cast from the HDMS Knud Rasmussen cruise KR_2021 that took place from 10-26 August 2021 and was part of the research project Greenland Gradients led by Rysgaard, Sören. On each station, vertical CTD (SBE19plus) casts were made down to 500 m water depth or close to the sea floor if shallower. Temperature and salinity data were derived from these CTD profiles. Temperature is reported as potential temperature (ITS-90, degree C).
    Keywords: Binary Object; Binary Object (File Size); Binary Object (MD5 Hash); Binary Object (Media Type); CTD/Rosette; CTD-RO; Date/Time of event; East Greenland; Elevation of event; Event label; File content; Glacier meltwater runoff; HDMS Knud Rasmussen; KN_2021; KR21044; KR21045; KR21046; KR21047; KR21048; KR21049; KR21050; KR21051; KR21052; KR21053; KR21054; KR21056; KR21057; KR21060; KR21061; KR21062; KR21063; KR21072; Labrador Sea; Latitude of event; Longitude of event; meteoric; water masses
    Type: Dataset
    Format: text/tab-separated-values, 36 data points
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    DATA PANGAEA
  • 6
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    Summer hydrographic conditions at proglacial fjord entrances along East Greenland during HDMS Knud Rasmussen expedition KN_2021 in August 2021 (2024)
    PANGAEA
    Details
    Publication Date: 2024-04-20
    Description: Here we present results from a synoptic survey of the pan‐east Greenland coastal system from the entrance of fjords at Cape Farewell (59°N) to Kaiser Franz Josef Fjord (73°N). Using conductivity‐temperature‐depth (CTD) profiles and water isotopes (δ18O, δ2H) sampling, we aim to describe the spatial distribution of water masses and source water fractions along east Greenland and their link to proglacial fjords. This is a hydrographic dataset containing stable water isotopes 18O & 2H samples from the HDMS Knud Rasmussen cruise KR_2021 that took place from 10-26 August 2021 and was part of the research project Greenland Gradients led by Rysgaard, Sören. Samples for analysis of water isotopic were collected at 1, 5, 10, 20, 30, 50, 75, 100, 150, 200, 250, 500 m depth in the water column at each station. Stable isotopes of oxygen and hydrogen (16O, 18O, 1H, 2H) in water samples were determined using a Cavity Ringdown Spectrometer, L2130-i Isotopic sH20 (Picarro Inc., USA).
    Keywords: Cavity ring-down spectrometers L2130-i Isotopic sH20, Picarro Inc.; CTD/Rosette; CTD-RO; Date/Time of event; DEPTH, water; East Greenland; Elevation of event; Event label; Glacier meltwater runoff; HDMS Knud Rasmussen; KN_2021; KR21044; KR21045; KR21046; KR21047; KR21048; KR21049; KR21050; KR21051; KR21052; KR21053; KR21054; KR21056; KR21057; KR21060; KR21061; KR21062; KR21063; KR21072; Labrador Sea; Latitude of event; Longitude of event; meteoric; Salinity; Temperature, water, potential; water masses; δ18O, water; δ18O, water, standard error; δ Deuterium, water; δ Deuterium, water, standard error
    Type: Dataset
    Format: text/tab-separated-values, 1172 data points
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    DATA PANGAEA
  • 7
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    Iron oxide reduction in deep Baltic Sea sediments: the potential role of anaerobic oxidation of methane (2015)
    Geophysical Research Abstracts
    In:  EPIC3EGU 2015, Vienna, Austria, 2015-04-12-2015-04-17Geophysical Research Abstracts
    Details
    Publication Date: 2015-03-04
    Repository Name: EPIC Alfred Wegener Institut
    Type: Conference , notRev
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    PAPER (OA)
  • 8
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    Iron oxide reduction in methane-rich deep Baltic Sea sediments (2017)
    PERGAMON-ELSEVIER SCIENCE LTD
    In:  EPIC3Geochimica et Cosmochimica Acta, PERGAMON-ELSEVIER SCIENCE LTD, 207, pp. 256-276, ISSN: 0016-7037
    Details
    Publication Date: 2017-04-24
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
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  • 9
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    Cable bacteria at oxygen-releasing roots of aquatic plants: a widespread and diverse plant–microbe association (2021)
    WILEY-BLACKWELL PUBLISHING
    In:  EPIC3New Phytologist, WILEY-BLACKWELL PUBLISHING, ISSN: 0028-646X
    Details
    Publication Date: 2021-10-11
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , peerRev
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