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  • OceanRep  (15)
  • Institut für Meereskunde  (11)
  • Oxford Univ. Press  (2)
  • Schweizerbart  (1)
  • Umweltbundesamt  (1)
  • 1
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    Microbial loop, microbial food web and classical food chain: Their significance in pelagic marine ecosystems (1992)
    Schweizerbart
    In:  Ergebnisse der Limnologie = Advances in limnology / Internationale Vereinigung für Theoretische und Angewandte Limnologie, 37 . pp. 265-278.
    Details
    Publication Date: 2018-03-19
    Description: The dependency of metabolic rates on cell size and the effect of temperature are demonstrated on a hypothetical size spectrum for a phytoplankton population in an oligotrophic open ocean region under steady-state conditions. The model spectrum illustrates the preponderance of small cells over large ones, especially their much higher weight-specific growth rates. It also shows that the allometric advantage of small cells, for instance in competing for limiting nutrients, is further enhanced by temperature increase. These basic facts are used to characterize the microbial and classical food web in relation to cold- and warm-water ecosystems and to new and regenerated production. It appears that the microbial food web is controlled by grazing and the classical food chain by nutrients. The former is present in all environments but is best adapted to oligotrophic warmwater ecosystems where regenerated production predominates. The microbial food web may be regarded as the original and normal form of life in the pelagic zone and the classical food web more as an exceptional feature depending on new production, which in turn is governed by the changing wind and temperature regime over the world ocean.
    Type: Article , PeerReviewed
    Format: text
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 2
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    A new 'turbulence incubator' for measuring primary production in non-stratified waters (2004)
    Oxford Univ. Press
    In:  Journal of Plankton Research, 26 (3). pp. 357-369.
    Details
    Publication Date: 2019-09-23
    Description: The so-called ‘turbulence incubator’ overcomes an essential disadvantage of static in situ incubations where at high irradiances an artificial photoinhibition is caused by neglecting turbulent mixing in the upper water column. It is operated on deck and simulates the changing light conditions for vertically mixed phytoplankton cells by moving the sample bottles horizontally through a circular water bath covered by a glass lid of neutral optical density filters. In this way the exponentially decreasing irradiance within the euphotic zone is simulated and photoinhibition near the surface is avoided. A crucial point is the choice of revolution rate for simulating turbulent mixing under natural conditions. The incubator is characterized by its handy size, a relatively simple and inexpensive construction and a battery-driven motor. It can thus even be operated on small vessels without an electric generator. The incubator is especially suited for vertically mixed waters such as shallow bays, tidal estuaries and rivers. Its reliability was successfully tested by a simultaneous comparison with in situ measurements at various stations representing different water types and environmental conditions, ranging from the turbid River Elbe to the clear open Baltic Sea. In 9 out of 11 experiments, higher primary production rates were obtained in the turbulence incubator than in static in situ incubations. The majority of the latter were characterized by a pronounced photoinhibition in the upper two incubation depths representing the 100 and 50% light levels. The average rate increase amounted to 22%, with a range between 11 and 53% depending on light attenuation and irradiance.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1093/plankt/fbh024
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 3
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    Die Bedeutung der Größenstruktur und des Stoffumsatzes des Zooplanktons für den Energietransfer im pelagischen Ökosystem der Auftriebsregion vor NW-Afrika (1987)
    Institut für Meereskunde
    In:  Berichte aus dem Institut für Meereskunde an der Christian-Albrechts-Universität Kiel, 174 . Institut für Meereskunde, Kiel, Germany, 137 pp.
    Details
    Publication Date: 2014-10-14
    Type: Report , NonPeerReviewed
    Format: text
    DOI: 10.3289/ifm_ber_174
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    OceanRep: Report - other report
  • 4
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    Hydrographic, chemical and planktological data from the north-west African upwelling area obtained from February to April 1983 : ("Ostatlantik-Biozirkel") (1985)
    Institut für Meereskunde
    In:  Berichte aus dem Institut für Meereskunde an der Christian-Albrechts-Universität Kiel, 140 . Institut für Meereskunde, Kiel, Germany, 105 pp.
    Details
    Publication Date: 2016-04-18
    Type: Report , NonPeerReviewed
    Format: text
    DOI: 10.3289/ifm_ber_140
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    OceanRep: Report - other report
  • 5
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    Planktological data from the central Red Sea and the Gulf of Aden : (R. V. "Meteor", cruise No. 5-2, January - March 1987) (1988)
    Institut für Meereskunde
    In:  Berichte aus dem Institut für Meereskunde an der Christian-Albrechts-Universität Kiel, 180 . Institut für Meereskunde, Kiel, Germany, 200 pp.
    Details
    Publication Date: 2014-10-14
    Type: Report , NonPeerReviewed
    Format: text
    DOI: 10.3289/ifm_ber_180
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    OceanRep: Report - other report
  • 6
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    Survival of tropical ballast water organisms during a cruise from the Indian Ocean to the North Sea (2000)
    Oxford Univ. Press
    In:  Journal of Plankton Research, 22 (5). pp. 923-937.
    Details
    Publication Date: 2018-05-30
    Description: In an assessment of non-indigenous species transported by international ship traffic to German waters, commissioned by the German Federal Environmental Agency, the survival of tropical plankton organisms in ballast water was studied by accompanying a container vessel on its 23-day voyage from Singapore to Bremerhaven in Germany. Two tanks, one filled off Singapore and the other off Colombo, Sri Lanka, were monitored for their phyto- and zooplankton content by daily sampling. As already reported in previous studies, species abundance and diversity, especially of zooplankton, decreased sharply during the first days, and only a few specimens survived the whole cruise. The contents of the Colombo tank, however, changed dramatically during the last week. The harpacticoid copepod, Tisbe graciloides, increased its abundance by a factor of 100 from 0.1 to 10ind. l–1 within a few days. This is the first time that a ballast water organism has been found to multiply at such a high rate. Opportunistic species such as Tisbe are apparently able to thrive and propagate in ballast water tanks under certain conditions. Ballast water tanks may thus serve as incubators for certain species depending on their characteristics.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1093/plankt/22.5.923
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 7
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    Einschleppung fremder Arten in Nord- und Ostsee: Untersuchungen zum ökologischen Gefahrenpotential durch den Schiffsverkehr (1996)
    Umweltbundesamt
    In:  Umweltbundesamt, Berlin, Germany, 279 pp.
    Details
    Publication Date: 2019-04-30
    Description: Umweltforschungsplan des Bundesministers für Umwelt, Naturschutz und Reaktorsicherheit: Wasser: Forschungsbericht 102 04 250
    Type: Book , PeerReviewed
    Format: text
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    OceanRep: Book
  • 8
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    Planktologie (1970)
    Institut für Meereskunde
    Details
    Publication Date: 2022-05-02
    Type: Article , NonPeerReviewed
    Format: text
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    OceanRep: Article in a Scientific Journal - without review
  • 9
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    On the population dynamics of two brackish-water Cladocera Podon leuckarti and Evadne nordmanni in Kiel Fjord (1981)
    Institut für Meereskunde
    Details
    Publication Date: 2022-05-25
    Description: Both Podon leuckarti and Evadne nordmanni play a predominant role in the plankton community of Kiel Fjord in summer. Increase and decrease of the populations were recorded through short-term sampling from May to the beginning of July. Abundance in relation to temperature and salinity, body size, number of embryos per female and the occurrence of permanent eggs were investigated. Podon leuckarti reached its peak at the end of May, two weeks earlier than Evadne normanni; the maximum abundance was 6500 individuals · m-3 and 8900 individuals · m-3 respectively. The rapid increase of both populations is characterized by an exponential growth phase. The estimated doubling time ranged from 0.5 to 4.3 days. With increasing temperature, body size and number of embryos per female decreased. An inspection of the stomach content showed that both species apparently had fed mainly on phytoplankton.
    Type: Article , NonPeerReviewed
    Format: text
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    OceanRep: Article in a Scientific Journal - without review
  • 10
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    Phytoplankton standing stock and primary production in the western Baltic (1981)
    Institut für Meereskunde
    Details
    Publication Date: 2022-05-24
    Description: The main studies on phytoplankton ecology carried out in Kiel Bight during the last decades are briefly reviewed. Special emphasis is laid on the hydrographical structure of this transitional area between the Baltic Sea and the North Sea, as it strongly affects the seasonal cycle of phytoplankton standing stock and species succession through vertical stratification and advection processes. Both these hydrographical features prevail during the growth period of phytoplankton and are responsible for large variations in population density and nutrient supply. The seasonal species succession is also influenced by advection. The annual primary production figure of about 150 g C·m-2 approaches the upper limit of values recorded for other parts of the western and southern Baltic. Total irradiation appears to exert the strongest influence on the seasonal cycle of primary production as long as water temperatures are low, giving way in summer to temperature as the determining factor for the production rate.
    Type: Article , NonPeerReviewed
    Format: text
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    OceanRep: Article in a Scientific Journal - without review
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