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  • 1
    Electronic Resource
    Electronic Resource
    Influence of crude oil on changes of bacterial communities in Arctic sea-ice (2005)
    Oxford, UK : Blackwell Publishing Ltd
    FEMS microbiology ecology 53 (2005), S. 0 
    Details
    ISSN: 1574-6941
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: The danger of a petroleum hydrocarbon spillage in the polar, ice-covered regions is increasing due to oil exploration in Arctic offshore areas and a growing interest in using the Northern Sea Route (NSR) as an alternative transportation route for Arctic oil and gas. However, little is known about the potential impact of accidental oil spills on this environment. We investigated the impact of crude oil on microbial community composition in six different Arctic sea-ice samples incubated with crude oil at 1 °C in microcosms for one year. Alterations in the composition of bacterial communities were analyzed with the culture-independent molecular methods DGGE (denaturing gradient gel electrophoresis) and FISH (fluorescence in situ hybridization). DGGE, FISH and cultivation methods revealed a strong shift in community composition toward the γ-proteobacteria in sea-ice and melt pool samples incubated with crude oil. Marinobacter spp., Shewanella spp. and Pseudomonas spp. were the predominant phylotypes in the oil-treated microcosms. The ability of indigenous sea-ice bacteria to degrade hydrocarbons at low temperature (1 °C) was tested using four representative strains cultivated from sea-ice enriched with crude oil. (14C]Hexadecane was degraded by the sea-ice isolates at 20–50% capacity of the mesophilic type strain Marinobacter hydrocarbonoclasticus, a known hydrocarbon degrader, incubated at 22 °C.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/j.femsec.2004.11.010
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    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Marine bacteria, VIIIPart VII: H. Laatsch, H. Pudleiner, B. Pelizaeus, K.-H. van Pée, Liebigs Ann. Chem. 1994, 65-71.. Maremycin A and B, new diketopiperazines from a marine Streptomyces sp. (1995)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1995 (1995), S. 1291-1294 
    Details
    ISSN: 0947-3440
    Keywords: Maremycin ; Diketopiperazines ; Metabolites, secondary ; Streptomyces, marine ; Chemical screening ; Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: In the culture broth of the marine Streptomyces sp. B 9173 the two novel diketopiperazines maremycin A (1) and B (2) were detected by chemical screening. Their structures were elucidated and confirmed by the synthesis of the oxindole derivative 4.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.1995199507171
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    Paper (German National Licenses)
    Fulltext
  • 3
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    Water column stratification and methanotrophy in Svalbard (2013)
    In:  [Talk] In: PERGAMON Symposium 2013, 05.-07.11.2013, Kiel .
    Details
    Publication Date: 2014-12-16
    Type: Conference or Workshop Item , NonPeerReviewed
    Location Call Number Limitation Availability
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    OceanRep: Talk
  • 4
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    Carbon, nitrogen and hydrocarbons contents in surface sediments off Carlini Base, Potter Cove, King George Island (Isla 25 de Mayo) after a diesel spill at Carlini Base (2017)
    PANGAEA
    Details
    Publication Date: 2023-03-16
    Keywords: Calculated; Carbon, inorganic, total; Carbon, organic, total; Carbon, organic, total/Nitrogen, total ratio; Carbon, total; Carbon, total/Nitrogen, total ratio; Carlini_Base; Coulometry; DATE/TIME; DEPTH, sediment/rock; Distance; Element analyser, Euro EA-CN; Gas chromatography, FID detector, dichloromethane extraction; Hydrocarbons; IMCOAST/IMCONet; Impact of climate induced glacier melt on marine coastal systems, Antarctica; LATITUDE; LONGITUDE; Nitrogen, total; Potter Peninsula, King George Island, Western Antarctica; Research station; RS; Sample ID; UTM Easting, Universal Transverse Mercator; UTM Northing, Universal Transverse Mercator; UTM Zone, Universal Transverse Mercator
    Type: Dataset
    Format: text/tab-separated-values, 468 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 5
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    Station list and links to master tracks in different resolutions of POLARSTERN cruise ANT-XXI/5, Cape Town - Bremerhaven, 2004-05-08 - 2004-06-02 (2015)
    PANGAEA
    In:  Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Bremerhaven
    Details
    Publication Date: 2023-03-16
    Keywords: ANT-XXI/5; Calculated; Course; CT; DATE/TIME; LATITUDE; LONGITUDE; Polarstern; PS65; PS65/5-track; Speed; Underway cruise track measurements
    Type: Dataset
    Format: text/tab-separated-values, 7462 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 6
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    Continuous thermosalinograph oceanography along POLARSTERN cruise track ANT-XXI/5 (2007)
    PANGAEA
    In:  Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Bremerhaven
    Details
    Publication Date: 2023-03-16
    Keywords: ANT-XXI/5; AWI_PhyOce; CT; DATE/TIME; DEPTH, water; LATITUDE; LONGITUDE; Physical Oceanography @ AWI; Polarstern; PS65; PS65/5-track; Salinity; Temperature, water; Thermosalinograph; TSG; Underway cruise track measurements
    Type: Dataset
    Format: text/tab-separated-values, 6388 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 7
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    Methane concentrations in the central North Sea (2015)
    PANGAEA
    In:  Supplement to: Mau, Susan; Gentz, Torben; Körber, Jan-Hendrik; Torres, Marta E; Römer, Miriam; Sahling, Heiko; Wintersteller, Paul; Martinez, Roi; Schlüter, Michael; Helmke, Elisabeth (2015): Seasonal methane accumulation and release from a gas emission site in the central North Sea. Biogeosciences, 12(18), 5261-5276, https://doi.org/10.5194/bg-12-5261-2015
    Details
    Publication Date: 2023-04-22
    Description: We investigated dissolved methane distributions along a 6 km transect crossing active seep sites at 40 m water depth in the central North Sea. These investigations were done under conditions of thermal stratification in summer (July 2013) and homogenous water column in winter (January 2014). Dissolved methane accumulated below the seasonal thermocline in summer with a median concentration of 390 nM, whereas during winter, methane concentrations were typically much lower (median concentration of 22 nM). High-resolution methane analysis using an underwater mass-spectrometer confirmed our summer results and was used to document prevailing stratification over the tidal cycle. We contrast estimates of methane oxidation rates (from 0.1 to 4.0 nM day**-1) using the traditional approach scaled to methane concentrations with microbial turnover time values and suggest that the scaling to concentration may obscure the ecosystem microbial activity when comparing systems with different methane concentrations. Our measured and averaged rate constants (k') were on the order of 0.01 day**-1, equivalent to a turnover time of 100 days, even when summer stratification led to enhanced methane concentrations in the bottom water. Consistent with these observations, we could not detect known methanotrophs and pmoA genes in water samples collected during both seasons. Estimated methane fluxes indicate that horizontal transport is the dominant process dispersing the methane plume. During periods of high wind speed (winter), more methane is lost to the atmosphere than oxidized in the water. Microbial oxidation seems of minor importance throughout the year.
    Keywords: AWI_PhyOce; Center for Marine Environmental Sciences; MARUM; Physical Oceanography @ AWI
    Type: Dataset
    Format: application/zip, 2 datasets
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    DATA PANGAEA
  • 8
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    Carbon, nitrogen and hydrocarbons contents in soils and sediments after a diesel spill at Carlini Base, King George Island (Isla 25 de Mayo) (2017)
    PANGAEA
    In:  Supplement to: Vázquez, Susana; Monien, Patrick; Pepino Minetti, Roberto; Jürgens, Jutta; Curtosi, Antonio; Villalba Primitz, Julia; Frickenhaus, Stephan; Abele, Doris; Mac Cormack, Walter; Helmke, Elisabeth (2017): Bacterial communities and chemical parameters in soils and coastal sediments in response to diesel spills at Carlini Station, Antarctica. Science of the Total Environment, 605-606, 26-37, https://doi.org/10.1016/j.scitotenv.2017.06.129
    Details
    Publication Date: 2023-03-16
    Description: A diesel spill occurring at Carlini Station (South Shetland Islands, West Antarctic Peninsula) in 2009 started the study of the fate of the hydrocarbons and their effect on the bacterial communities of the Potter Cove ecosystem. Soils and sediments were sampled across the 200-meter long diesel plume towards Potter Cove four and 15 months after the spill, austral summers 2009/2010 and 2010/2011. The hydrocarbon fraction spilt over frozen and snow-covered ground reached the sea and dispersed with the currents. Contrary, diesel that infiltrated unfrozen soil remained detectable for years, and was seeping with ground water. Structural changes of the bacterial communities as well as hydrocarbon, carbon and nitrogen contents were investigated in sediments in front of the station, two affected terrestrial sites, and a terrestrial non-contaminated reference site.
    Keywords: IMCOAST/IMCONet; Impact of climate induced glacier melt on marine coastal systems, Antarctica
    Type: Dataset
    Format: application/zip, 2 datasets
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 9
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    Underwater mass spectrometry (UWMS) methane concentrations in the central North Sea (2015)
    PANGAEA
    Details
    Publication Date: 2023-04-22
    Keywords: Center for Marine Environmental Sciences; Counts; DEPTH, water; MARUM; Methane
    Type: Dataset
    Format: text/tab-separated-values, 35 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 10
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    Methane measurements during POLARSTERN cruise ARK-XXII/2
    PANGAEA
    In:  Supplement to: Damm, Ellen; Helmke, Elisabeth; Thoms, Silke; Schauer, Ursula; Nöthig, Eva-Maria; Bakker, Karel; Kiene, Ronald P (2010): Methane production in aerobic oligotrophic surface water in the central Arctic Ocean. Biogeosciences, 7, 1099-1108, https://doi.org/10.5194/bg-7-1099-2010
    Details
    Publication Date: 2023-05-12
    Description: A methane surplus relative to the atmospheric equilibrium is a frequently observed feature of ocean surface water. Despite the common fact that biological processes are responsible for its origin, the formation of methane in aerobic surface water is still poorly understood. We report on methane production in the central Arctic Ocean, which was exclusively detected in Pacific derived water but not nearby in Atlantic derived water. The two water masses are distinguished by their different nitrate to phosphate ratios. We show that methane production occurs if nitrate is depleted but phosphate is available as a P source. Apparently the low N:P ratio enhances the ability of bacteria to compete for phosphate while the phytoplankton metabolite dimethylsulfoniopropionate (DMSP) is utilized as a C source. This was verified by experimentally induced methane production in DMSP spiked Arctic sea water. Accordingly we propose that methylated compounds may serve as precursors for methane and thermodynamic calculations show that methylotrophic methanogenesis can provide energy in aerobic environments.
    Keywords: Arctic Ocean; ARK-XXII/2; Bottle number; CTD/Rosette; CTD/Rosette, ultra clean; CTD-RO; CTD-UC; Date/Time of event; DEPTH, water; Dimethylsulfoniopropionate; Elevation of event; Event label; Gas chromatography; GEOTRACES; Global marine biogeochemical cycles of trace elements and their isotopes; Laptev Sea; Latitude of event; Longitude of event; Mass spectrometer Finnigan Delta Plus XP; Methane; Polarstern; PS70/260-9; PS70/263-1; PS70/264-1; PS70/266-1; PS70/268-1; PS70/271-2; PS70/272-1; PS70/279-7; PS70/280-1; PS70/284-1; PS70/285-2; PS70/291-1; PS70/295-1; PS70/299-1; PS70/301-5; PS70/301-7; PS70/306-1; PS70/308-1; PS70/310-1; PS70/314-1; PS70/321-1; PS70/326-1; PS70/328-11; PS70/328-9; PS70/331-1; PS70/335-1; PS70/338-3; PS70/338-5; PS70/340-1; PS70/342-7; PS70/342-9; PS70/345-1; PS70/346-1; PS70/349-2; PS70/352-3; PS70/352-5; PS70/358-1; PS70/362-1; PS70/403-1; PS70/405-1; PS70/407-2; PS70/407-4; PS70/408-1; PS70/409-1; PS70/410-1; PS70/411-2; PS70 SPACE DAMOCLES; δ13C, methane
    Type: Dataset
    Format: text/tab-separated-values, 1139 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
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