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  • 1
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    Unbekannt
    Phytoplankton carbon dynamics during a winter-spring diatom bloom in an enclosed marine ecosystem: Primary production, biomass and loss rates (1989)
    In:  EPIC3Marine biology, 103, pp. 131-142
    Details
    Publikationsdatum: 2019-07-17
    Repository-Name: EPIC Alfred Wegener Institut
    Materialart: Article , isiRev
    Standort Signatur Einschränkungen Verfügbarkeit
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    ARTIKEL (OA)
  • 2
    Digitale Medien
    Digitale Medien
    Phytoplankton carbon dynamics during a winter-spring diatom bloom in an enclosed marine ecosystem: primary production, biomass and loss rates (1989)
    Springer
    Marine biology 103 (1989), S. 131-142 
    Details
    ISSN: 1432-1793
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract Phytoplankton production, standing crop, and loss processes (respiration, sedimentation, grazing by zooplankton, and excretion) were measured on a daily basis during the growth, dormancy and decline of a winter-spring diatom bloom in a large-scale (13 m3) marine mesocosm in 1987. Carbonspecific rates of production and biomass change were highly correlated whereas production and loss rates were unrelated over the experimental period when the significant changes in algal biomass characteristic of phytoplankton blooms were occurring. The observed decline in diatom growth rates was caused by nutrient limitation. Daily phytoplankton production rates calculated from the phytoplankton continuity equation were in excellent agreement with rates independently determined using standard 14C techniques. A carbon budget for the winter bloom indicated that 82.4% of the net daytime primary production was accounted for by measured loss processes, 1.3% was present as standing crop at the end of the experiment, and 16.3% was unexplained. Losses via sedimentation (44.8%) and nighttime phytoplankton respiration (24.1%) predominated, while losses due to zooplankton grazing (10.7%) and nighttime phytoplankton excretion (2.8%) were of lesser importance. A model simulating daily phytoplankton biomass was developed to demonstrate the relative importance of the individual loss processes.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00391071
    Standort Signatur Einschränkungen Verfügbarkeit
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    Artikel (Nationallizenzen)
    Volltext
  • 3
    Digitale Medien
    Digitale Medien
    Effects of ultraviolet-B enhancement on marine trophic levels in a stratified coastal system (1997)
    Springer
    Marine biology 130 (1997), S. 277-287 
    Details
    ISSN: 1432-1793
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract We examined the effects of enhanced UV-B radiation (relative to ambient) on marine trophic levels inhabiting a stratified coastal ecosystem, using living models (13 000 liter marine enclosures) of a temperate estuarine water column. The experiment was carried out in June and July 1994 on a plankton community drawn from lower Narragansett Bay, Rhode Island, USA. The effects of altered UV-B radiation (elevated 50% over ambient, tenfold DNA-weighted) on three trophic strata: the primary producers (photosynthetic algae), primary herbivores (copepods), and fish eggs and larvae (Anchoa mitchilli Cuvier and Valenciennes) were examined. The goal was to determine if UV-B–induced alterations at the base of the food chain had impacts on other elements of the trophic web. Phytoplankton abundance (P=0.02) and biomass (P=0.007) were significantly reduced in UV-B–enhanced treatments, above but not below the thermocline (2.25 m), during the second week of the study. Copepod nauplii were significantly less abundant in UV-B–enhanced mesocosms than in control treatments during the third and fourth weeks of the study (P=0.01). A portion of the impact on nauplii may be a result of alterations at the base of the food web. The greater mortality of nauplii in UV-B–enhanced systems did not translate to reduced abundance of copepodite (P=0.83) or adult (P=0.29) copepods. No significant effects were observed for microzooplankton (P=0.15). Neither the mortality rates nor the growth rates of larval anchovy were significantly affected by the experimental increase in UV-B (P〉0.05). Despite the tenfold increase in biologically damaging UV-B, effects were not seen at higher trophic levels, most likely because of the rapid extinction of UV-B in the highly colored coastal water.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/s002270050247
    Standort Signatur Einschränkungen Verfügbarkeit
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    Artikel (Nationallizenzen)
    Volltext
  • 4
    Digitale Medien
    Digitale Medien
    Mesocosm studies of DCMU-enhanced fluorescence as a measure of phytoplankton photosynthesis (1987)
    Springer
    Marine biology 96 (1987), S. 107-114 
    Details
    ISSN: 1432-1793
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract When measurements of in-vivo fluorescence are used to estimate photosynthesis in the field, the marked temporal and spatial variations in phytoplankton populations, and their nutrient and light histories, have produced varied results. Natural phytoplankton populations in large, flow-through mesocosms with different controlled nutrient and sewage sludge additions were sampled weekly from June to September 1984. Good correlations were observed between the increase in fluorescence upon the addition of DCMU (ΔF) and both in-situ production and the parameters (Pm and α) of the photosynthesis-irradiance curve for these phytoplankton populations. Good correlations were also obtained between DCMU-enhanced fluorescence (FDCMU) and chlorophyll a concentrations. The relationship between ΔF and in-situ 14C production was consistent among mesocosms even in the face of major shifts from diatom-dominated to dinoflagellate-dominated populations. On the other hand, the FDCMU:Chl a relationship was significantly different between mesocosms and related to species composition. It was concluded that ΔF offers the possibility of rapidly and accurately indexing both in-situ production and the photosynthetic capacity of mixed phytoplankton populations.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00394843
    Standort Signatur Einschränkungen Verfügbarkeit
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    Artikel (Nationallizenzen)
    Volltext
  • 5
    Digitale Medien
    Digitale Medien
    Improvements needed in lubricating grease production (1965)
    Springer
    Chemistry and technology of fuels and oils 1 (1965), S. 548-550 
    Details
    ISSN: 1573-8310
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie , Werkstoffwissenschaften, Fertigungsverfahren, Fertigung
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00731400
    Standort Signatur Einschränkungen Verfügbarkeit
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    Artikel (Nationallizenzen)
    Volltext
  • 6
    facet.materialart.
    Unbekannt
    Phytoplankton carbon dynamics during a winter/spring diatom bloom in an enclosed marine ecosystem: primary production, biomass and loss rates (1989)
    Springer
    In:  Marine Biology, 103 . pp. 131-142.
    Details
    Publikationsdatum: 2018-03-21
    Beschreibung: Phytoplankton production, standing crop, and loss processes (respiration, sedimentation, grazing by zooplankton, and excretion) were measured on a daily basis during the growth, dormancy and decline of a winter-spring diatom bloom in a large-scale (13 m3) marine mesocosm in 1987. Carbonspecific rates of production and biomass change were highly correlated whereas production and loss rates were unrelated over the experimental period when the significant changes in algal biomass characteristic of phytoplankton blooms were occurring. The observed decline in diatom growth rates was caused by nutrient limitation. Daily phytoplankton production rates calculated from the phytoplankton continuity equation were in excellent agreement with rates independently determined using standard 14C techniques. A carbon budget for the winter bloom indicated that 82.4% of the net daytime primary production was accounted for by measured loss processes, 1.3% was present as standing crop at the end of the experiment, and 16.3% was unexplained. Losses via sedimentation (44.8%) and nighttime phytoplankton respiration (24.1%) predominated, while losses due to zooplankton grazing (10.7%) and nighttime phytoplankton excretion (2.8%) were of lesser importance. A model simulating daily phytoplankton biomass was developed to demonstrate the relative importance of the individual loss processes.
    Materialart: Article , PeerReviewed
    Format: text
    DOI: 10.1007/BF00391071
    Standort Signatur Einschränkungen Verfügbarkeit
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    OceanRep: Artikel in einer Fachzeitschrift - begutachtet
  • 7
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    Unbekannt
    Magnetic and superconducting phase diagram of Nb/Gd/Nb trilayers (2018)
    American Physical Society (APS)
    Details
    Publikationsdatum: 2018-04-14
    Beschreibung: Author(s): Yu. N. Khaydukov, A. S. Vasenko, E. A. Kravtsov, V. V. Progliado, V. D. Zhaketov, A. Csik, Yu. V. Nikitenko, A. V. Petrenko, T. Keller, A. A. Golubov, M. Yu. Kupriyanov, V. V. Ustinov, V. L. Aksenov, and B. Keimer We report on a study of the structural, magnetic, and superconducting properties of Nb ( 25 nm ) / Gd ( d f ) / Nb ( 25 nm ) hybrid structures of a superconductor/ ferromagnet (S/F) type. The structural characterization of the samples, including careful determination of the layer thickness, was performed using neut... [Phys. Rev. B 97, 144511] Published Fri Apr 13, 2018
    Schlagwort(e): Superfluidity and superconductivity
    Print ISSN: 1098-0121
    Digitale ISSN: 1095-3795
    Thema: Physik
    Publiziert von American Physical Society (APS)
    Standort Signatur Einschränkungen Verfügbarkeit
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    PAPER CURRENT
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