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  • 1
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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
  • 2
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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
  • 3
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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
  • 4
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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
  • 5
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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
  • 6
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    Planktologie (1970)
    Institut für Meereskunde
    Details
    Publication Date: 2022-05-02
    Type: Article , NonPeerReviewed
    Format: text
    Location Call Number Limitation Availability
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    OceanRep: Article in a Scientific Journal - without review
  • 7
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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
  • 8
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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
  • 9
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    Planktologische Beobachtungen auf einem Schnitt durch die Nordsee von Cuxhaven nach Edinburgh (1967)
    Institut für Meereskunde
    Details
    Publication Date: 2022-04-22
    Description: Im August 1966 wurden zwischen Cuxhaven und Edinburgh 39 Oberflachenproben in 10 sm Abstand und 17 Tiefenproben auf 5 Vertikalstationen entnommen. Es wurden die Verteilung von Temperatur, Salzgehalt, Trübung, Gelbstoff-, Chlorophyll a- und Eiweißgehalt und die Artenzusammensetzung des größeren Phytoplanktons untersucht. Folgende Wassermassen wurden beobachtet: 1. Das Wasser der Deutschen Bucht mit hohen Werten für die Trübung, den Gelbstoff-, Chlorophyll- und Eiweißgehalt. Das Phytoplankton ist durch den Reichtum an Diatomeen mit der vorherrschenden Art Rhizosolenia imbricata var. shrubsolei gekennzeichnet. 2. Das salzreiche Doggerbankwasser atlantischer Herkunft, das sehr niedrige Werte für die untersuchten biologischen Faktoren aufweist. Neben den Diatomeen werden Dinoflagellaten häufig. 3. Das Britannische Ostktüstenwasser mit einem leicht erhöhten Gelbstoffgehalt aber sonst ebenfalls sehr niedrigen Werten für Trübung, Chlorophyll a und Eiweiß. Die Kieselalgen sind von Peridineen abgelöst worden. Die Leitform ist Ceratium furca. Der Küsteneinfluß ist an der schottischen Küste sehr viel geringer als in der Deutschen Bucht. Die niedrigen Chlorophyll- und Eiweißwerte in der offenen Nordsee kennzeichnen das sommerliche Minimum in der Planktonentwicklung.
    Type: Article , NonPeerReviewed
    Format: text
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  • 10
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    Zur Bestimmung des Extinktionskoeffizienten für Chlorophyll a in Methanol (1968)
    Institut für Meereskunde
    Details
    Publication Date: 2022-04-26
    Description: Anhand von zwei käuflichen Präparaten wird die Extinktion von Chlorophyll a in verschiedenen Lösungsmitteln untersucht und daraus der Extinktionskoeffizient für frisch extrahiertes, ungetrocknetes Chlorophyll a in Methanol abgeleitet. Er beträgt für das rote Extinktionsmaximum bei 665 nm 75.0 l/g cm. Die Extinktionskoeffizienten von getrocknetem Chlorophyll a sind in den untersuchten Lösungsmitteln 10-25% niedriger als die von einer frisch extrahierten Chlorophyllösung (Tabelle 2). Die Messung des Chlorophyll a-Gehaltes kann mit hinreichender Genauigkeit in einem Filterphotometer (ELKO II, Zeiss) ausgeführt werden. Hierzu werden Eichkurven für drei verschiedene Interferenzfilter angegeben. From two purchasable preparations of crystalline chlorophyll a, the extinction coefficient of undried chlorophyll a in methanol has been calculated as 75.0 l/g cm at the maximum of extinction at 665 nm. The extinction coefficients of dried chlorophyll a in the different solvents tested are 10-25% lower than those of undried chlorophyll a (table 2). Chlorophyll a can be measured in a filter photometer (ELKO II, Zeiss) with sufficient precision. Standard curves for three different interference filters are given.
    Type: Article , NonPeerReviewed
    Format: text
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    OceanRep: Article in a Scientific Journal - without review
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