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  • Elsevier  (9)
  • Kiel  (4)
  • Copernicus Publications (EGU)  (2)
  • Gustav Fischer Verlag  (1)
  • Vreie Universiteit Brussels  (1)
  • 1
    Online Resource
    Online Resource
    Kalzifizierung der Coccolithophoride Emiliania huxleyi (Proymnesiophyceae) unter Betrachtung des Zellzyklus (2004)
    Kiel
    Details Availability
    Keywords: Hochschulschrift ; Sargassosee ; Coccolithophoridae ; Verkalkung
    Type of Medium: Online Resource
    Pages: 1 Online-Ressource (97 Seiten = 5 MB) , Illustrationen, Graphen
    Edition: Online-Ausgabe 2021
    URL: https://oceanrep.geomar.de/54401/
    Language: German
    Note: Zusammenfassung in deutscher und englischer Sprache
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  • 2
    Online Resource
    Online Resource
    Selective grazing and calcite dissolution by microzooplankton during a mesocosm experiment (2006)
    Kiel
    Details Availability
    Keywords: Hochschulschrift ; Zooplankton ; Verkalkung
    Type of Medium: Online Resource
    Pages: 1 Online-Ressource (72 Seiten = 10 MB) , Illustrationen, Graphen
    Edition: 2021
    URL: https://oceanrep.geomar.de/54447/
    Language: English
    Note: Zusammenfassung in deutscher und englischer Sprache
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  • 3
    Online Resource
    Online Resource
    Microzooplankton in the pelagic food web of the East Greenland Sea and its role in sedimentation processes (1991)
    Kiel
    Details Availability
    Keywords: Hochschulschrift
    Type of Medium: Online Resource
    Pages: 1 Online-Ressource (115 Seiten = 5 MB) , Illustrationen, Graphen, Karte
    Edition: Online-Ausgabe 2023
    URL: https://oceanrep.geomar.de/id/eprint/44850/
    Language: English
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  • 4
    Online Resource
    Online Resource
    The oceans "biological pump" : strength and efficiency (2005)
    Kiel
    Details Availability
    Keywords: Hochschulschrift ; Aufsatzsammlung ; Meeresströmung
    Type of Medium: Online Resource
    Pages: 1 Online-Ressource (303 Seiten = 19 MB) , Illustrationen, Graphen, Karten
    Edition: Online-Ausgabe
    URL: https://oceanrep.geomar.de/id/eprint/59325/
    DDC: 577.714
    Language: English
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  • 5
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    Solubilization of Particles in Sediment Traps: Revising the Stoichiometry of Mixed Layer Export (2005)
    Copernicus Publications (EGU)
    In:  Biogeosciences (BG), 2 . pp. 189-204.
    Details
    Publication Date: 2019-01-21
    Description: Sinking particles, once caught in sediment trap jars, release dissolved elements into the surrounding medium through leaching from their pore fluids, chemical dissolution and the activity of free exoenzymes. This results in an increase in dissolved elements in the trap jar supernatant. Elemental fluxes as traditionally measured by sediment traps underestimate total export when this particle-associated dissolved flux is not considered. The errors introduced are variable and alter both the absolute levels of flux as well as the stoichiometry of export. These errors have been quantified and corrections applied for samples from sediment traps in the North Atlantic based on measurements of excess dissolved carbon, nitrogen, phosphorus, silica and calcium in the supernatant of the collection cups. At the base of the winter mixed layer, on average 90±6% of phosphorus fluxes are found as excess phosphate whereas for carbon and nitrogen dissolved concentrations account for 30 (±8)% and 47(±11)% of total fluxes respectively. Excess dissolved silica is on average 61 (±17)% of total biogenic silica flux. Little (〈10%) of calcium is solubilized. The proportion of dissolved to total flux decreases with trap deployment depth. Calculations of the C:N:P ratios for particles only are well above the Redfield ratios of 106:16:1 (Redfield et al., 1963), although the mid-water dissolved N:P and N:Si values as well as the C:N:P ratios of remineralisation along isopycnals conform to the Redfield ratios at this site. Accounting for dissolved fluxes of all these elements brings the stoichiometry of export in agreement with the Redfield Ratio and with other geochemical estimates of winter mixed layer export. A factor of 3 to 4 higher ratios of organic: inorganic carbon export also implies that the net atmospheric CO2 sequestration by the biological pump is about 50% higher at this site when the dissolved elemental fluxes are considered. Solubilization is thus a process that should be accounted for in protocols used to measure vertical fluxes with sediment traps.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.5194/bg-2-189-2005
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  • 6
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    Taxon-specific growth and selective microzooplankton grazing of phytoplankton in the Northeast Atlantic (2001)
    Elsevier
    In:  Journal of Marine Systems, 30 . pp. 241-261.
    Details
    Publication Date: 2017-07-12
    Description: Taxon-specific microzooplankton dynamics were studied along a transect through the North Atlantic Drift from 70°N 04°E to 40°N 20°W during July 1997 using serial dilution and nutrient-enrichment experiments. Nutrient concentrations and microzooplankton composition indicated postbloom conditions at 40°N, 47°N, and 50°N, a transitional system at 54°N, and bloom conditions at 62°N and 70°N. The ratio of microzooplankton to phytoplankton biomass was inversely related to nitrate and phosphate concentrations. Potential grazing thresholds were observed in four of nine experiments at 40–66% of the initial phytoplankton concentration. Grazing losses were determined for six pigment-specific classes of phytoplankton. Selective grazing losses of phytoplankton taxa ranged from 73% to 248% of the nonselective grazing losses predicted according to their biomass contributions. The grazing selectivity varied considerably between communities, with the microherbivores showing positive selection for cyanobacteria and dinoflagellates and predominantly avoidance of chlorophyta and bacillariophyceae. Microzooplankton did not show a preference for the dominant phytoplankton taxa, but grazed preferentially on fast-growing phytoplankton with minor contributions (〈15%) to the phytoplankton biomass. However, bacillariophyceae were the major contributors to phytoplankton biomass and accounted for major fractions of the total losses through microzooplankton grazing. Microzooplankton consumed the equivalent of 0.12–5.5 times their own biomass daily on a carbon basis, amounting to 65–197% of gross phytoplankton production. With the conservative assumption that 20% of the consumed phytoplankton was converted to microzooplankton biomass, the latter was estimated to contribute 27–381% to the net production of the entire microzooplankton community. We therefore conclude that the taxonomic structure and the net production of the microzooplankton communities were significantly affected by the intensity and selectivity of herbivorous microzooplankton grazing.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1016/S0924-7963(01)00061-6
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  • 7
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    Export of POC from the surface mixed layer (2001)
    Vreie Universiteit Brussels
    In:  In: European Network for Integrated Marine Science Analysis. , ed. by Dehairs, F. and Goeyens, L. Vreie Universiteit Brussels, Brüssel, Belgium.
    Details
    Publication Date: 2019-09-13
    Type: Book chapter , PeerReviewed
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  • 8
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    Tintinnen (1995)
    Gustav Fischer Verlag
    In:  In: Praktikum der Protozoologie. , ed. by Röttger, R. Gustav Fischer Verlag, Stuttgart, pp. 208-215. ISBN 3-437-30754-1
    Details
    Publication Date: 2019-07-26
    Type: Book chapter , NonPeerReviewed
    Format: text
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  • 9
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    Export production in the Bay of Biscay as estimated from barium – barite in settling material: a comparison with new production (2000)
    Elsevier
    In:  Deep Sea Research Part I: Oceanographic Research Papers, 47 (4). pp. 583-601.
    Details
    Publication Date: 2020-08-05
    Description: We present barium data for sediment traps deployed in a northeast Atlantic margin environment (Bay of Biscay). Fluxes of excess barium were measured with the objective of calculating carbon export production rates from the surface mixed layer and thus contribute to the understanding of organic carbon transport in a margin environment. Therefore, it was necessary to properly understand the different processes that affected the barium fluxes in this margin environment. Seasonal variability of POC/Ba flux ratios and decrease of barium solubilisation in the trap cups with increasing depth in the water column probably indicate that the efficiency of barite formation in the organic micro-environment varies with season and that the process is relatively slow and not yet completed in the upper 600 m of water column. Thus barite presence in biogenic aggregates will significantly depend on water column transit time of these aggregates. Furthermore, it was observed that significant lateral input of excess-Ba can occur, probably associated with residual currents leaving the margin. This advected excess-Ba affected especially the recorded fluxes in the deeper traps (〉1000 m) of the outer slope region. We have attempted to correct for this advected excess-Ba component, using Th (reported by others for the same samples) as an indicator of enhanced lateral flux and assigning a characteristic Ba/Th ratio to advected material. Using transfer functions relating excess-Ba flux with export production characteristic of margin areas, observed Ba fluxes indicate an export production between 7 and 18 g C m−2 yr−1. Such values are 3–7 times lower than estimates based on N-nutrient uptake and nutrient mass balances, but larger and more realistic than is obtained when a transfer function characteristic of open ocean systems is applied. The discrepancy between export production estimates based on excess-Ba fluxes and nutrient uptake could be resolved if part of the carbon is exported as dissolved organic matter. Results suggest that margin systems function differently from open ocean systems, and therefore Ba-proxy rationales developed for open ocean sites might not be applicable in margin areas.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1016/S0967-0637(99)00072-2
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  • 10
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    Microzooplankton grazing and phytoplankton growth in marine mesocosms with increased CO2 levels (2008)
    Copernicus Publications (EGU)
    In:  Biogeosciences (BG), 5 . pp. 1145-1156.
    Details
    Publication Date: 2012-07-06
    Description: Microzooplankton grazing and algae growth responses to increasing pCO2 levels (350, 700 and 1050 μatm) were investigated in nitrate and phosphate fertilized mesocosms during the PeECE III experiment 2005. Grazing and growth rates were estimated by the dilution technique combined with taxon specific HPLC pigment analysis. Microzooplankton composition was determined by light microscopy. Despite a range of up to 3 times the present CO2 levels, there were no clear differences in any measured parameter between the different CO2 treatments. During days 3–9 of the experiment the algae community standing stock, measured as chlorophyll a (Chl-a), showed the highest instantaneous grow rates (k=0.37–0.99 d−1) and increased from ca. 2–3 to 6–12 μg l−1, in all mesocosms. Afterwards the phytoplankton standing stock decreased in all mesocosms until the end of the experiment. The microzooplankton standing stock, that was mainly constituted by dinoflagellates and ciliates, varied between 23 and 130 μg C l−1 (corresponding to 1.9 and 10.8 μmol C l−1), peaking on day 13–15, apparently responding to the phytoplankton development. Instantaneous Chl-a growth rates were generally higher than the grazing rates, indicating only a limited overall effect of microzooplankton grazing on the most dominant phytoplankton. Diatoms and prymnesiophytes were significantly grazed (12–43% of the standing stock d−1) only in the pre-bloom phase when they were in low numbers, and in the post-bloom phase when they were already affected by low nutrients and/or viral lysis. The cyanobacteria populations appeared more affected by microzooplankton grazing which generally removed 20–65% of the standing stock per day.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.5194/bg-5-1145-2008
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