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  • 2015-2019
  • 2000-2004  (11)
  • 2002  (11)
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  • 2015-2019
  • 2000-2004  (11)
Year
  • 1
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    Direct relationship between CO2 uptake and transparent exopolymer particles production in natural phytoplankton (2002)
    Oxford Univ. Press
    In:  Journal of Plankton Research, 24 (1). pp. 49-53.
    Details
    Publication Date: 2018-06-01
    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.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1093/plankt/24.1.49
    Location Call Number Limitation Availability
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 2
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    The Role of Transparent Exopolymer Particles (TEP) for Variations of the C:N:P Ratios during Phytoplankton Blooms (2002)
    In:  [Talk] In: EGS XXVII General Assembly, 21.- 26.04.2002, Nice, France .
    Details
    Publication Date: 2019-08-09
    Description: A fraction of the photosynthetically fixed carbon is not used for phytoplankton growth, but channelled to the outer medium via exudation. This fraction include carbon rich exopolymers that coagulate to particles, such as transparent exopolymer particles (TEP). Through aggregation with cells and debris, TEP are incorporated into large, rapidly settling marine snow and contribute to the vertical flux of organic matter to the deep sea. The influence of TEP formation on the C:N:P stoichiometry of marine phy- toplankton blooms was examined during two mesocosm studies. During the blooms, which were dominated by a natural assembly of marine diatoms and the calcifying coccolithophorid Emiliania huxleyi, respectively, an increase of TEP concentration was observed immediately after nutrient depletion, followed by the appearance of ma- rine snow. The contribution of TEP to the carbon flow during both blooms indicates that sinking of TEP-rich marine snow is a possible mechanism for the removal of carbon from surface waters above calculations based on Redfield stoichiometry.
    Type: Conference or Workshop Item , NonPeerReviewed
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    OceanRep: Talk
  • 3
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    The role of aggregation for the dissolution of diatom frustules (2002)
    In:  [Talk] In: 8. Symposium on Aquatic Microbial Ecology (SAME-8), 25.-29.10.2002, Taormina, Sicily, Italy .
    Details
    Publication Date: 2019-08-09
    Type: Conference or Workshop Item , NonPeerReviewed
    Location Call Number Limitation Availability
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    OceanRep: Talk
  • 4
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    Temporal decoupling of carbon and nitrogen dynamics in a mesocosm diatom bloom (2002)
    ASLO (Association for the Sciences of Limnology and Oceanography)
    In:  Limnology and Oceanography, 47 (3). pp. 753-761.
    Details
    Publication Date: 2014-01-30
    Description: Flows of the major biogeochemical elements (C, N, P, Si) and of transparent exopolymer particles (TEP) were traced during a bloom of a natural assemblage of marine diatoms in a mesocosm (l m(3)) to determine whether the exudation and subsequent gelation of carbon-rich phytoplankton exopolymers can account for the formation and potential export of carbon in excess of that predicted by Redfield ratios. Exponential growth of the phytoplankton community in the mesocosm extended for 10 d until nitrate concentration fell below detection and concentrations of dissolved inorganic and particulate organic nitrogen and phosphorus remained stable. Tight covariation of particulate organic elements occurred as long as nutrients were replete. But, after nitrate depletion, decoupling of carbon dynamics from that of nitrogen and phosphorus was observed, with a large flow of carbon into TEP An uptake of 72% more dissolved inorganic carbon (DIC) than inferred from nitrate supply and Redfield stoichiometry (referred to as carbon overconsumption) occurred during the study, largely during the postbloom phase, and was almost entirely traced to the particulate organic matter (POM) pool. Marine snow (aggregates 〉0.5 mm) appeared at the onset of nitrate depletion and coincided with rapid increase in TEP concentrations. Elemental composition of marine snow differed from the Redfield ratio by an enrichment in carbon and a depletion in phosphorus relative to nitrogen. It is suggested that sinking of TEP-rich marine snow could be a possible mechanism for export of carbon above calculations that are based on the Redfield stoichiometry.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.4319/lo.2002.47.3.0753
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 5
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    Chemical and biological composition of suspended particles and aggregates in the Baltic Sea in summer (1999). (2002)
    Elsevier
    In:  Estuarine, Coastal and Shelf Science, 55 . pp. 729-741.
    Details
    Publication Date: 2019-09-23
    Description: Suspended particles and particle aggregates, which formed from concentrated field samples on the roller table, were characterized biologically and chemically along a transect through the Baltic Sea in summer 1999. Phytoplankton composition in field samples was dominated by cyanobacteria, including the filamentous diazotrophic cyanobacteria Aphanizomenon ‘ baltica’, Nodularia spumigena and Anabaena spp. These species formed aggregates together with diatoms, mainly Skeletonema costatum and Chaetoceros spp. and with dinoflagellates, mainly withDinophysis norvegica . Compared to the Redfield ratio, concentration ratios of particulate organic carbon, nitrogen and phosphorus, [POC]:[PON]:[POP], indicated an enrichment of carbon, especially in aggregates. However, regression analysis indicated a higher production rate of PON relative to POP and POC and significant background concentrations of POC. In field samples the concentration of transparent exopolymer particles (TEP) varied around 200 μg Xanthan Equiv. l−1 and comprised a volume fraction of 2–7 ppm and an abundance of about 105 TEP ml−1. TEP were enriched in aggregates as inferred from volume ratios of TEP to conventional particles. It is suggested, that TEP contribute substantially to the background concentration of POC, while the high production rate of PON is attributed to nitrogen fixation of diazotrophic cyanobacteria.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1006/ecss.2001.0927
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 6
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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
  • 7
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    Direct Relationship between CO2-uptake and Transparent Exopolymer Particles (TEP) Production in Natural Phytoplankton (2002)
    In:  EPIC3Journal of Plankton Research, 24, 1, pp. 49-53
    Details
    Publication Date: 2019-07-17
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
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    PAPER (OA)
  • 8
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    Chemical and Biological Composition of Suspended Particles and Aggregates in the Baltic Sea in Summer (1999) (2002)
    In:  EPIC3Estuarine coastal and shelf science, 55, 5, pp. 729-741
    Details
    Publication Date: 2019-07-17
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
    Format: application/pdf
    Location Call Number Limitation Availability
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    PAPER (OA)
  • 9
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    Temporal decoupling of carbon and nitrogen dynamics in a mesocosm diatom bloom (2002)
    In:  EPIC3Limnology and Oceanography, 47, 3, pp. 753-761
    Details
    Publication Date: 2019-07-17
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
    Format: application/pdf
    Location Call Number Limitation Availability
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    PAPER (OA)
  • 10
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    The role of aggregation for the dissolution of diatom frustules (2002)
    In:  EPIC3FEMS, Taormina, Sicily.
    Details
    Publication Date: 2019-07-17
    Repository Name: EPIC Alfred Wegener Institut
    Type: Conference , notRev
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    PAPER (OA)
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