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  • Inter Research  (2)
  • PANGAEA  (1)
  • 2000-2004  (3)
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Year
  • 1
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    Carbon and nitrogen content of transparent exopolymer particles (TEP) in relation to their Alcian Blue adsorption (2001)
    Inter Research
    In:  Marine Ecology Progress Series, 219 . pp. 1-10.
    Details
    Publication Date: 2018-05-28
    Description: The carbon and nitrogen content of transparent exopolymer particles (TEP) was determined and related to the concentration of TEP as quantified by a colorimetrical method. TEP were produced in the laboratory from dissolved precursors by laminar or turbulent shear. Dissolved precursors were obtained by 0.2 µm filtration from diatom cultures, with or without nutrient reduction, and from natural diatom populations. The relationship between carbon and TEP was significant, linear and species-specific. Carbon concentration of TEP derived from this relationship concurred with previous findings. Shortage of silicic acid or nitrate in the culture media had no effect on the carbon content of TEP. Molar C:N ratios of TEP were above the Redfield ratio, with a mean value of 26. It is suggested that the nitrogen fraction of TEP can be explained by adsorption of dissolved organic nitrogen (DON) onto TEP. Based on the newly established relationship, concentrations of TEP-derived carbon (TEP-C) were calculated for the Baltic Sea, the coastal Pacific, the North East Atlantic and the Northern Adriatic Sea.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.3354/meps219001
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 2
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    Transparent exopolymer particles and dissolved organic carbon production by Emiliania huxleyi exposed to different CO2 concentrations: a mesocosm experiment (2004)
    Inter Research
    In:  Aquatic Microbial Ecology, 34 (1). pp. 93-104.
    Details
    Publication Date: 2016-05-26
    Description: The role of transparent exopolymer particles (TEP) and dissolved organic carbon (DOC) for organic carbon partitioning under different CO2 conditions was examined during a mesocosm experiment with the coccolithophorid Emiliania huxleyi. We designed 9 outdoor enclosures (similar to11 m(3)) to simulate CO2 concentrations of estimated 'Year 2100' (similar to710 ppm CO2), 'present' (similar to410 ppm CO2) and 'glacial' (similar to190 ppm CO2) environments, and fertilized these with nitrate and phosphate to favor bloom development. Our results showed fundamentally different TEP and DOC dynamics during the bloom. In all mesocosms, TEP concentration increased after nutrient exhaustion and accumulated steadily until the end of the study. TEP concentration was closely related to the abundance of E. huxleyi and accounted for an increase in POC concentration of 35 2 % after the onset of nutrient limitation. The production of TEP normalized to the cell Abundance of E. huxleyi was highest in the Year 2100 treatment. In contrast, DOC concentration exhibited considerable short-term fluctuations throughout the study. In all mesocosms, DOC was neither related to the abundance of E. huxleyi nor to TEP concentration. A statistically significant effect of the CO2 treatment on DOC concentration was not determined. However, during the course of the bloom, DOC concentration increased in 2 of the 3 Year 2100 mesocosms and in 1 of the present mesocosms, but in none of the glacial mesocosms. It is suggested that the observed differences between TEP and DOC were determined by their different bioavailability and that a rapid response of the microbial food web may have obscured CO2 effects on DOC production by autotrophic cells.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.3354/ame034093
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 3
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    Seawater carbonate chemistry and particulate organic particles during an incubation experiments with natural phytoplankton community, 2002 (2002)
    PANGAEA
    In:  Supplement to: Engel, Anja (2002): Direct relationship between CO2 uptake and transparent exopolymer particles production in natural phytoplankton. Journal of Plankton Research, 24(1), 49-53, https://doi.org/10.1093/plankt/24.1.49
    Details
    Publication Date: 2024-03-15
    Description: Incubation experiments with natural phytoplankton revealed a relationship between CO2 concentration and the production of transparent exopolymer particles (TEP), with TEP production being linearly related to theoretical CO2 uptake rates. The effect of different CO2 concentrations on TEP production was examined during incubation experiments with natural phytoplankton sampled at two different locations in the central Baltic Sea in summer 1999.
    Keywords: Alkalinity, total; Aragonite saturation state; Baltic Sea; Bicarbonate ion; Biomass/Abundance/Elemental composition; Bottles or small containers/Aquaria (〈20 L); Calcite saturation state; Calculated; Calculated from salinity; Calculated using seacarb after Nisumaa et al. (2010); Carbon, inorganic, dissolved; Carbon, organic, particulate; Carbonate ion; Carbonate system computation flag; Carbon dioxide; CN-analyser (CHN-O-rapid); Coast and continental shelf; Colorimetry; CTD; Density, mass density; Determination of phosphorus (Koroleff, in Grasshoff et al., 1983, Chemie GmbH); Engel_02/I; Engel_02/II; Entire community; EPOCA; EUR-OCEANS; European network of excellence for Ocean Ecosystems Analysis; European Project on Ocean Acidification; Event label; EXP; Experiment; Experimental treatment; Fugacity of carbon dioxide (water) at sea surface temperature (wet air); Laboratory experiment; Nitrogen, organic, particulate; OA-ICC; Ocean Acidification International Coordination Centre; Partial pressure of carbon dioxide (water) at sea surface temperature (wet air); Pelagos; pH; pH, Electrode; Phosphorus, organic, particulate; Salinity; Temperate; Temperature, water; Transparent exopolymer particles as Gum Xanthan equivalents per volume
    Type: Dataset
    Format: text/tab-separated-values, 336 data points
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    DATA PANGAEA
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