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  • PANGAEA  (15)
  • Blackwell Publishing Ltd  (1)
  • National Academy of Sciences  (1)
Document type
Keywords
Publisher
Years
  • 1
    Electronic Resource
    Electronic Resource
    The role of aggregation for the dissolution of diatom frustules (2003)
    Oxford, UK : Blackwell Publishing Ltd
    FEMS microbiology ecology 46 (2003), S. 0 
    Details
    ISSN: 1574-6941
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Observations that the majority of silica dissolution occurs within the upper 200 m of the ocean, and that sedimentation rates of diatom frustules generally do not decrease significantly with depth, suggested reduced dissolution rates of diatoms embedded within sinking aggregates. To investigate this hypothesis, silica dissolution rates of aggregated diatom cells were compared to those of dispersed cells during conditions mimicking sedimentation below the euphotic zone. Changes in the concentrations of biogenic silica, silicic acid, cell numbers, chlorophyll a and transparent exopolymer particles (TEP) were monitored within aggregates and in the surrounding seawater (SSW) during two 42-day experiments. Whereas the concentration of dispersed diatoms decreased over the course of the experiment, the amount of aggregated cells remained roughly constant after an initial increase. Initially only 6% of cells were aggregated and at the end of the experiment more than 60% of cells were enclosed within aggregates. These data imply lower dissolution rates for aggregated cells. However, fluxes of silica between the different pools could not be constrained reliably enough to unequivocally prove reduced dissolution for aggregated cells.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/S0168-6496(03)00199-5
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    Paper (German National Licenses)
    Fulltext
  • 2
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    Physical oceanography during LITTORINA cruise PEX86 (2002)
    PANGAEA
    Details
    Publication Date: 2023-03-03
    Keywords: CTD; Date/Time of event; DEPTH, water; Elevation of event; Event label; Latitude of event; Littorina; Longitude of event; MSN; Multiple opening/closing net; PEX86; PEX86_10; PEX86_11; PEX86_12; PEX86_13; PEX86_14; PEX86_15; PEX86_16; PEX86_17; PEX86_18; PEX86_19; PEX86_20; PEX86_21; PEX86_22; PEX86_23; PEX86_24; PEX86_25; PEX86_26; PEX86_27; PEX86_28; PEX86_29; PEX86_3; PEX86_30; PEX86_31; PEX86_32; PEX86_33; PEX86_4; PEX86_5; PEX86_6; PEX86_7; PEX86_8; PEX86_9; Temperature, water
    Type: Dataset
    Format: text/tab-separated-values, 390 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 3
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    Thalassiosira weissflogii attachment assay and phylogenetic affiliation of bacterial isolates from samples of the German Wadden Sea
    PANGAEA
    In:  Supplement to: Gärdes, Astrid; Iversen, Morten Hvitfeldt; Grossart, Hans-Peter; Passow, Uta; Ullrich, Matthias S (2011): Diatom-associated bacteria are required for aggregation of Thalassiosira weissflogii. The ISME Journal, 5(3), 436-445, https://doi.org/10.1038/ismej.2010.145
    Details
    Publication Date: 2023-05-12
    Description: Aggregation of algae, mainly diatoms, is an important process in marine systems leading to the settling of particulate organic carbon predominantly in the form of marine snow. Exudation products of phytoplankton form transparent exopolymer particles (TEP), which acts as the glue for particle aggregation. Heterotrophic bacteria interacting with phytoplankton may influence TEP formation and phytoplankton aggregation. This bacterial impact has not been explored in detail. We hypothesized that bacteria attaching to Thalassiosira weissflogii might interact in a yet-to-be determined manner, which could impact TEP formation and aggregate abundance. The role of individual T. weissflogii-attaching and free-living new bacterial isolates for TEP production and diatom aggregation was investigated in vitro. T. weissflogii did not aggregate in axenic culture, and striking differences in aggregation dynamics and TEP abundance were observed when diatom cultures were inoculated with either diatom-attaching or free-living bacteria. The data indicated that free-living bacteria might not influence aggregation whereas bacteria attaching to diatom cells may increase aggregate formation. Interestingly, photosynthetically inactivated T. weissflogii cells did not aggregate regardless of the presence of bacteria. Comparison of aggregate formation, TEP production, aggregate sinking velocity and solid hydrated density revealed remarkable differences. Both, photosynthetically active T. weissflogii and specific diatom-attaching bacteria were required for aggregation. It was concluded that interactions between heterotrophic bacteria and diatoms increased aggregate formation and particle sinking and thus may enhance the efficiency of the biological pump.
    Keywords: Center for Marine Environmental Sciences; DIVER; German_Bight_1997-1999; German_Wadden_Sea_2000; German Bight, North Sea; German Bight Wadden Sea; German Wadden Sea; MARUM; PLA; Plankton net; Sampling by diver
    Type: Dataset
    Format: application/zip, 4 datasets
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    DATA PANGAEA
  • 4
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    (Table 1) Thalassiosira weissflogii attachment assay
    PANGAEA
    Details
    Publication Date: 2023-05-12
    Keywords: Bacterial abundance in colony forming units; Center for Marine Environmental Sciences; German_Wadden_Sea_2000; German Bight Wadden Sea; German Wadden Sea; MARUM; PLA; Plankton net; see reference(s); Time coverage
    Type: Dataset
    Format: text/tab-separated-values, 28 data points
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    DATA PANGAEA
  • 5
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    (Supplementary Table 1) Phylogenetic affiliation of particle-associated bacterial isolates
    PANGAEA
    Details
    Publication Date: 2023-05-12
    Keywords: Best match; Center for Marine Environmental Sciences; German_Wadden_Sea_2000; German Bight Wadden Sea; German Wadden Sea; MARUM; PLA; Plankton net; see reference(s); Similarity; Strain
    Type: Dataset
    Format: text/tab-separated-values, 99 data points
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    DATA PANGAEA
  • 6
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    (Supplementary Table 2) Phylogenetic affiliation of bacterial strains isolated from Halichondria panacea
    PANGAEA
    Details
    Publication Date: 2023-05-12
    Keywords: Best match; Center for Marine Environmental Sciences; DIVER; German_Bight_1997-1999; German Bight, North Sea; MARUM; Sampling by diver; see reference(s); Similarity; Strain
    Type: Dataset
    Format: text/tab-separated-values, 93 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 7
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    (Supplementary Table 3) Phylogenetic affiliation of particle-associated bacterial isolates
    PANGAEA
    Details
    Publication Date: 2023-05-12
    Keywords: Center for Marine Environmental Sciences; German_Wadden_Sea_2000; German Bight Wadden Sea; German Wadden Sea; Group; MARUM; PLA; Plankton net; Sample code/label; see reference(s); Strain
    Type: Dataset
    Format: text/tab-separated-values, 63 data points
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    DATA PANGAEA
  • 8
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    Surface active substances in the water column during POLARSTERN cruise ANT-XXI/3 (EIFEX) (2014)
    PANGAEA
    In:  Supplement to: Croot, Peter L; Passow, Uta; Assmy, Philipp; Jansen, Sandra; Strass, Volker H (2007): Surface active substances in the upper water column during a Southern Ocean Iron Fertilization Experiment (EIFEX). Geophysical Research Letters, 34(3), L03612, https://doi.org/10.1029/2006GL028080
    Details
    Publication Date: 2023-10-28
    Description: Surface active substances (SAS) in the water column were measured by voltammetry using the electrochemical probe o-nitrophenol (ONP) during EIFEX, a mesoscale open ocean iron enrichment experiment in the Southern Ocean. SAS levels were low throughout the experiment (〈0.005 - 0.03 mg/L Triton X-100 equivalents). Initially SAS was extremely low in the photic zone, but as the phytoplankton bloom developed concentrations markedly increased throughout the upper 100 m (~0.02 mg/L Triton X-100 equivalents). Highest concentrations of SAS (〉0.02 mg/L Triton X-100 equivalents) were found at the end of the bloom particularly at density discontinuities where organic material may accumulate. Exudates from diatoms appeared to be the major source of SAS during EIFEX, either from direct extracellular release or in the action of being grazed upon by zooplankton.
    Keywords: ANT-XXI/3; Comment; Date/Time of event; DEPTH, water; Elevation of event; Event label; GOFLO; Go-Flo bottles; Latitude of event; Longitude of event; Polarstern; Priority Programme 1158 Antarctic Research with Comparable Investigations in Arctic Sea Ice Areas; PS65/508-1; PS65/514-1; PS65/543-9; PS65/570-1; PS65/580-1; PS65 EIFEX; South Atlantic Ocean; SPP1158; Surface active substances; Surface active substances, standard deviation; Voltammetry
    Type: Dataset
    Format: text/tab-separated-values, 144 data points
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    DATA PANGAEA
  • 9
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    Saccharides, TEP and iron measured on water bottle samples during POSEIDON cruise POS320/1 (2013)
    PANGAEA
    Details
    Publication Date: 2024-02-16
    Keywords: 06PO20050321; CTD; CTD/Rosette; CTD-RO; Date/Time of event; DEPTH, water; Elevation of event; Event label; Iron; Iron, dissolved; Iron, dissolved, standard deviation; Iron, standard deviation; Latitude of event; Longitude of event; Monosaccharides as glucose equivalent; Monosaccharides as glucose equivalent, standard deviation; Polysaccharides as glucose equivalent; Polysaccharides as glucose equivalent, standard deviation; POS320/1; POS320/1_36-1; POS320/1_37-1; POS320/1_40-1; POS320/1_42-1; POS320/1_43-1; POS320/1_46-1; POS320/1_47-1; POS320/1_49-1; POS320/1_50-1; POS320/1_51-1; POS320/1_52-1; POS320/1_52-2; POS320/1_55-2; POS320/1_56-1; POS320/1_58-2; POS320/1_61-2; POS320/1_62-1; POS320/1_63-1; POS320/1_64-1; POS320/1_65-2; POS320/1_68-1; Poseidon; Saccharides, total as glucose equivalent; Saccharides, total as glucose equivalent, standard deviation; Sample ID; SOPRAN; Surface Ocean Processes in the Anthropocene; Teflon pump; Transparent exopolymer particles as Gum Xanthan equivalents per volume; Transparent exopolymer particles as Gum Xanthan equivalents per volume, std dev; Tropical NE Atlantic
    Type: Dataset
    Format: text/tab-separated-values, 1411 data points
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    DATA PANGAEA
  • 10
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    Hydrochemistry measured on water bottle samples during METEOR cruise M10/1 (1993)
    PANGAEA
    In:  Supplement to: Passow, Uta; Peinert, Rolf (1993): The role of plankton in particle flux; two case studies from the northeast Atlantic. Deep Sea Research Part II: Topical Studies in Oceanography, 40(1-2), 573-585, https://doi.org/10.1016/0967-0645(93)90033-J
    Details
    Publication Date: 2024-02-02
    Description: The relationship between the vertical flux of microplankton and its standing stock in the upper ocean was determined in the subtropical (33°N, 21°W) and tropical (18°N, 30°W) northeast Atlantic in spring 1989 as part of the North Atlantic Bloom Experiment. In the subtropical area specific sedimentation rates at all depths were low (0.1% of standing stock) and 10-20% of settled particulate organic carbon (POC) was viable diatoms. The high contribution of viable diatoms, their empty frustules and tintinnid loricae to settled material characterized a system in transition between a diatom bloom sedimentation event and an oligotrophic summer situation. In the tropical area specific sedimentation rates were similar, but absolute rates (3 mg C m?2 day?1) were only about a third of those in the subtropical area. Microplankton carbon contributed only 2-6% to POC. Hard parts of heterotrophs found embedded in amorphous detrital matter suggest that particles had passed through a complex food web prior to sedimentation. Coccolithophorids, not diatoms dominated the autotrophic fraction in traps, and a shift in the composition of autotrophs may indicate a perturbation of the oligotrophic system.
    Keywords: Ammonium; Bottle, Niskin 30-L; Carbon, organic, particulate; Carbon/nitrogen analyser (GF/F filtered); Chlorophyll a; Chlorophyll a, fluorometric determination (Grasshoff et al., 1983, Chemie GmbH); Colorometric analysis, manual; Continuous Flow Automated Analysis (Gordon et al., 1993, WOCE Tech Rpt 93-1); Date/Time of event; DEPTH, water; Elevation of event; Event label; Gravimetric analysis (GF/F filtered); JGOFS; Joint Global Ocean Flux Study; Latitude of event; Longitude of event; M10/1; M10/1-RO6-241_003; M10/1-RO6-241_004; M10/1-RO6-245_006; M10/1-RO6-245_007; M10/1-RO6-249_009; M10/1-RO6-249_010; M10/1-RO6-254_011; M10/1-RO6-254_012; M10/1-RO6-260_013; M10/1-RO6-260_014; M10/1-RO6-266_016; M10/1-RO6-266_017; M10/1-RO6-273_020; M10/1-RO6-273_021; M10/1-RO6-279_024; M10/1-RO6-279_025; M10/1-RO6-283_028; M10/1-RO6-283_029; M10/1-RO6-287_031; M10/1-RO6-287_032; M10/1-RO6-292_034; M10/1-RO6-292_035; M10/1-RO6-361_039; M10/1-RO6-361_040; M10/1-RO6-366_044; M10/1-RO6-366_045; M10/1-RO6-370_046; M10/1-RO6-370_047; M10/1-RO6-376_049; M10/1-RO6-376_050; M10/1-RO6-382_054; M10/1-RO6-382_055; M10/1-RO6-387_058; M10/1-RO6-387_059; M10/1-RO6-387_060; M10/1-RO6-393_063; M10/1-RO6-393_064; M10/1-RO6-398_067; M10/1-RO6-398_068; M10/1-RO6-398_069; M10/1-RO6-403_071; M10/1-RO6-403_072; Meteor (1986); NABE; NIS_30L; Nitrate and Nitrite; Nitrite; Nitrogen, organic, particulate; North Atlantic Bloom Experiment, 1989-1991; Oxidation; then autoanalysis (GF/F filtered); Oxidation (alkaline) with borate buffered potassium persulphate; Phosphate; Phosphorus, particulate; Silicate; Silicon, particulate; Suspended matter, total
    Type: Dataset
    Format: text/tab-separated-values, 1700 data points
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    DATA PANGAEA
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