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  • 2015-2019  (58)
  • 2005-2009  (1)
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  • 1
    Online-Ressource
    Online-Ressource
    Vorhabenbezeichnung: SO254 - PoriBacNewZ - functional diversity of bacterial communities and the metabolome in the water column, sediment and in sponges in the Southwest Pacific araound New Zealand : Schlussbericht : Laufzeit des Vorhabens: 01.010.2016-28.02.2019 (2019)
    [Oldenburg] : [Carl von Ossietzky Universität Oldenburg]
    Details Verfügbarkeit
    Schlagwort(e): Forschungsbericht
    Materialart: Online-Ressource
    Seiten: 1 Online-Ressource (39 Seiten, 2,66 MB) , Diagramme, Karten
    URL: https://doi.org/10.2314/KXP:1689536381
    DOI: 10.2314/KXP:1689536381
    Sprache: Deutsch
    Anmerkung: Förderkennzeichen BMBF 03G0254A , Unterschiede zwischen dem gedruckten Dokument und der elektronischen Ressource können nicht ausgeschlossen werden
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  • 2
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    Ocean Acidification Experiments in Large-Scale Mesocosms Reveal Similar Dynamics of Dissolved Organic Matter Production and Biotransformation (2017)
    Frontiers
    In:  Frontiers in Marine Science, 4 . Art.Nr. 271.
    Details
    Publikationsdatum: 2020-02-06
    Beschreibung: Dissolved organic matter (DOM) represents a major reservoir of carbon in the oceans. Environmental stressors such as ocean acidification (OA) potentially affect DOM production and degradation processes, e.g., phytoplankton exudation or microbial uptake and biotransformation of molecules. Resulting changes in carbon storage capacity of the ocean, thus, may cause feedbacks on the global carbon cycle. Previous experiments studying OA effects on the DOM pool under natural conditions, however, were mostly conducted in temperate and coastal eutrophic areas. Here, we report on OA effects on the existing and newly produced DOM pool during an experiment in the subtropical North Atlantic Ocean at the Canary Islands during an (1) oligotrophic phase and (2) after simulated deep water upwelling. The last is a frequently occurring event in this region controlling nutrient and phytoplankton dynamics. We manipulated nine large-scale mesocosms with a gradient of pCO2 ranging from ~350 up to ~1,030 μatm and monitored the DOM molecular composition using ultrahigh-resolution mass spectrometry via Fourier-transform ion cyclotron resonance mass spectrometry (FT-ICR-MS). An increase of 37 μmol L−1 DOC was observed in all mesocosms during a phytoplankton bloom induced by simulated upwelling. Indications for enhanced DOC accumulation under elevated CO2 became apparent during a phase of nutrient recycling toward the end of the experiment. The production of DOM was reflected in changes of the molecular DOM composition. Out of the 7,212 molecular formulae, which were detected throughout the experiment, ~50% correlated significantly in mass spectrometric signal intensity with cumulative bacterial protein production (BPP) and are likely a product of microbial transformation. However, no differences in the produced compounds were found with respect to CO2 levels. Comparing the results of this experiment with a comparable OA experiment in the Swedish Gullmar Fjord, reveals similar succession patterns for individual compound pools during a phytoplankton bloom and subsequent accumulation of these compounds were observed. The similar behavior of DOM production and biotransformation during and following a phytoplankton bloom irrespective of plankton community composition and CO2 treatment provides novel insights into general dynamics of the marine DOM pool.
    Materialart: Article , PeerReviewed
    Format: text
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    DOI: 10.3389/fmars.2017.00271
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  • 3
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    Efficient removal of recalcitrant deep-ocean dissolved organic matter during hydrothermal circulation (2015)
    Nature Publishing Group
    In:  Nature Geoscience, 8 (11). pp. 856-860.
    Details
    Publikationsdatum: 2021-04-23
    Beschreibung: Oceanic dissolved organic carbon (DOC) is an important carbon pool, similar in magnitude to atmospheric CO2, but the fate of its oldest forms is not well understood. Hot hydrothermal circulation may facilitate the degradation of otherwise un-reactive dissolved organic matter, playing an important role in the long-term global carbon cycle. The oldest, most recalcitrant forms of DOC, which make up most of oceanic DOC, can be recovered by solid-phase extraction. Here we present measurements of solid-phase extractable DOC from samples collected between 2009 and 2013 at seven vent sites in the Atlantic, Pacific and Southern oceans, along with magnesium concentrations, a conservative tracer of water circulation through hydrothermal systems. We find that magnesium and solid-phase extractable DOC concentrations are correlated, suggesting that solid-phase extractable DOC is almost entirely lost from solution through mineralization or deposition during circulation through hydrothermal vents with fluid temperatures of 212-401°C. In laboratory experiments, where we heated samples to 380°C for four days, we found a similar removal efficiency. We conclude that thermal degradation alone can account for the loss of solid-phase extractable DOC in natural hydrothermal systems, and that its maximum lifetime is constrained by the timescale of hydrothermal cycling, at about 40 million years
    Materialart: Article , PeerReviewed
    Format: text
    Format: text
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    DOI: 10.1038/ngeo2543
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  • 4
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    Effects of ocean acidification on marine dissolved organic matter are not detectable over the succession of phytoplankton blooms (2015)
    AAAS
    In:  Science Advances, 1 (9). e1500531-e1500531.
    Details
    Publikationsdatum: 2017-04-13
    Beschreibung: Marine dissolved organic matter (DOM) is one of the largest active organic carbon reservoirs on Earth, and changes in its pool size or composition could have a major impact on the global carbon cycle. Ocean acidification is a potential driver for these changes because it influences marine primary production and heterotrophic respiration. We simulated ocean acidification as expected for a “business-as-usual” emission scenario in the year 2100 in an unprecedented long-term mesocosm study. The large-scale experiments (50 m3 each) covered a full seasonal cycle of marine production in a Swedish Fjord. Five mesocosms were artificially enriched in CO2 to the partial pressure expected in the year 2100 (900 μatm), and five more served as controls (400 μatm). We applied ultrahigh-resolution mass spectrometry to monitor the succession of 7360 distinct DOM formulae over the course of the experiment. Plankton blooms had a clear effect on DOM concentration and molecular composition. This succession was reproducible across all 10 mesocosms, independent of CO2 treatment. In contrast to the temporal trend, there were no significant differences in DOM concentration and composition between present-day and year 2100 CO2 levels at any time point of the experiment. On the basis of our results, ocean acidification alone is unlikely to affect the seasonal accumulation of DOM in productive coastal environments.
    Materialart: Article , PeerReviewed
    Format: text
    DOI: 10.1126/sciadv.1500531
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  • 5
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    Acidification and warming affect prominent bacteria in two seasonal phytoplankton bloom mesocosms (2016)
    Wiley
    In:  Environmental Microbiology, 18 (12). pp. 4579-4595.
    Details
    Publikationsdatum: 2020-11-23
    Beschreibung: In contrast to clear stimulatory effects of rising temperature, recent studies of the effects of CO2 on planktonic bacteria have reported conflicting results. To better understand the potential impact of predicted climate scenarios on the development and performance of bacterial communities, we performed bifactorial mesocosm experiments (pCO2 and temperature) with Baltic Sea water, during a diatom dominated bloom in autumn and a mixed phytoplankton bloom in summer. The development of bacterial community composition (BCC) followed well-known algal bloom dynamics. A principal coordinate analysis (PCoA) of bacterial OTUs (operational taxonomic units) revealed that phytoplankton succession and temperature were the major variables structuring the bacterial community whereas the impact of pCO2 was weak. Prokaryotic abundance and carbon production, and organic matter concentration and composition were partly affected by temperature but not by increased pCO2. However, pCO2 did have significant and potentially direct effects on the relative abundance of several dominant OTUs; in some cases, these effects were accompanied by an antagonistic impact of temperature. Our results suggest the necessity of high-resolution BCC analyses and statistical analyses at the OTU level to detect the strong impact of CO2 on specific bacterial groups, which in turn might also influence specific organic matter degradation processes.
    Materialart: Article , PeerReviewed
    Format: text
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    DOI: 10.1111/1462-2920.13549
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  • 6
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    Total dissolved organic carbon and total dissolved nitrogen in sediment pore water of the central Arctic Ocean collected during POLARSTERN cruise ARK-XXVII/3 from August-September 2012 (2015)
    PANGAEA
    Details
    Publikationsdatum: 2023-03-16
    Beschreibung: During the RV Polarstern cruise ARK-XXVII/3 to the Arctic Ocean in summer 2012, when sea ice declined to a record minimum bottom, water and sediment pore water samples were collected with a TV-guided multicorer at stations in the Nansen and Amundsen basin. 50 ml sediment pore water samples were collected from 0-1, 1-5 and 5-10 cm sediment depths from up to 4 parallel sediment cores at each station. Additionally, overlying bottom waters were carefully collected from undisturbed sediment cores. Acidified pore water samples (pH2) were used for analysis of DOC and TDN concentrations. The measurements were performed by hand injection via catalytic oxidation at high temperature on a TOC-V Shimadzu instrument.
    Schlagwort(e): ABYSS; Arctic Ocean; ARK-XXVII/3; Assessment of bacterial life and matter cycling in deep-sea surface sediments; B_LANDER; Bottom lander; Carbon, organic, dissolved; Carbon, organic, dissolved, standard deviation; Date/Time of event; Depth, bottom/max; DEPTH, sediment/rock; Depth, top/min; Elevation of event; Event label; HTCO, Shimadzu TOC-V; Latitude of event; Longitude of event; Multicorer with television; Nitrogen, total dissolved; Nitrogen, total dissolved, standard deviation; Polarstern; PS80/236-1; PS80/240-2; PS80/251-1; PS80/260-2; PS80/277-3; PS80/338-2; PS80/350-2; PS80/362-1; PS80/371-1; PS80/394-2; PS80 IceArc; Station label; TVMUC
    Materialart: Dataset
    Format: text/tab-separated-values, 195 data points
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    DATA PANGAEA
  • 7
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    Contribution of formulae and elemental ratios of solid phase extracted dissolved organic matter (SPE-DOM) from POLARSTERN cruise ARK-XXVII/3 (IceArc) in 2012 (2015)
    PANGAEA
    Details
    Publikationsdatum: 2023-03-16
    Schlagwort(e): ABYSS; Arctic Ocean; ARK-XXVII/3; Assessment of bacterial life and matter cycling in deep-sea surface sediments; Depth, bottom/max; Depth, top/min; DEPTH, water; Event label; Mass spectrometer Solarix FT-ICR; Multicorer with television; Percentage of total formulae; Polarstern; PS80/240-2; PS80/260-2; PS80/277-3; PS80/338-2; PS80/350-2; PS80/362-1; PS80/394-2; PS80 IceArc; Sample ID; Station label; TVMUC
    Materialart: Dataset
    Format: text/tab-separated-values, 1084 data points
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    DATA PANGAEA
  • 8
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    Molecular formulae with CHONSP elements from POLARSTERN cruise ARK-XXVII/3 (IceArc) in 2012 (2015)
    PANGAEA
    Details
    Publikationsdatum: 2023-03-16
    Schlagwort(e): ABYSS; Arctic Ocean; ARK-XXVII/3; Assessment of bacterial life and matter cycling in deep-sea surface sediments; Date/Time of event; Depth, bottom/max; Depth, top/min; DEPTH, water; Event label; Latitude of event; Longitude of event; Mass spectrometer Solarix FT-ICR; Multicorer with television; Percentage of total formulae; Polarstern; PS80/240-2; PS80/260-2; PS80/277-3; PS80/338-2; PS80/350-2; PS80/362-1; PS80/394-2; PS80 IceArc; Sample ID; Station label; TVMUC
    Materialart: Dataset
    Format: text/tab-separated-values, 627 data points
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    DATA PANGAEA
  • 9
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    Bacterial sequence information wood colonization experiment during RV Meteor cruise M70/2 (2017)
    PANGAEA
    Details
    Publikationsdatum: 2023-03-22
    Schlagwort(e): Accession number, genetics; CHEMECO; Comment; Date; Depth, bottom/max; DEPTH, sediment/rock; Depth, top/min; Domain, biology; Elevation of event; Event label; Experiment; Experimental treatment; File name; GBT; HERMES; HERMIONE; Hotspot Ecosystem Research and Mans Impact On European Seas; Hotspot Ecosystem Research on the Margins of European Seas; Instrument; Laboratory; Large collection box; Latitude of event; Longitude of event; MEDECO2; MEDECO2-D338-PANIER-1; MEDECO2-D338-PC-6; MEDECO2-D338-PC-7; MEDECO2-D338-Wood2-1; MEDECO2-D338-WOOD6-1; MEDECO2-D339-BOX; MEDECO2-D339-PC-10; MEDECO2-D339-PC-16; Method comment; Monitoring colonisation processes in chemosynthetic ecosystems; Nile Fan Pockmark Area; PAN; Pourquoi Pas ? (2005); Primers; PUC; Push corer; Region, genetic; ROV drawer; Sample material; WOOD; Wood substrat
    Materialart: Dataset
    Format: text/tab-separated-values, 120 data points
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    DATA PANGAEA
  • 10
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    Molecular dissolved organic matter composition in lakes across Sweden as relative intensities of FT-ICR-MS peaks and PARAFAC components and optical indices (2015)
    PANGAEA
    In:  Supplement to: Kellerman, Anne M; Kothawala, Dolly N; Dittmar, Thorsten; Tranvik, Lars J (2015): Persistence of dissolved organic matter in lakes related to its molecular characteristics. Nature Geoscience, 8, 454-457, https://doi.org/10.1038/ngeo2440
    Details
    Publikationsdatum: 2023-01-13
    Beschreibung: Whether intrinsic molecular properties or extrinsic factors such as environmental conditions control the decomposition of natural organic matter across soil, marine and freshwater systems has been subject to debate. Comprehensive evaluations of the controls that molecular structure exerts on organic matter's persistence in the environment have been precluded by organic matter's extreme complexity. Here we examine dissolved organic matter from 109 Swedish lakes using ultrahigh-resolution mass spectrometry and optical spectroscopy to investigate the constraints on its persistence in the environment. We find that degradation processes preferentially remove oxidized, aromatic compounds, whereas reduced, aliphatic and N-containing compounds are either resistant to degradation or tightly cycled and thus persist in aquatic systems. The patterns we observe for individual molecules are consistent with our measurements of emergent bulk characteristics of organic matter at wide geographic and temporal scales, as reflected by optical properties. We conclude that intrinsic molecular properties are an important control of overall organic matter reactivity.
    Materialart: Dataset
    Format: application/zip, 2 datasets
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    DATA PANGAEA
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