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  • Schweizerbart  (1)
  • Springer  (1)
  • 1990-1994  (2)
Document type
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  • 1
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    Unknown
    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
    Location Call Number Limitation Availability
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 2
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    Unknown
    Zooplankton standing stock and community size structure within the epipelagic zone: a comparison between the central Red Sea and the Gulf of Aden (1994)
    Springer
    In:  Marine Biology, 119 (2). pp. 191-198.
    Details
    Publication Date: 2019-09-23
    Description: Standing stock and size composition of the zooplankton comunity (〉100 μm) were studied in four depth strata of the upper 200 m of the water column during a “Meteor” cruise to the central Red Sea and Gulf of Aden in spring 1987. The central Red Sea was divided into a northern area of higher salinity and a less saline southern part. Both areas exhibited significant differences in zooplankton abundance and standing stock. The latter increased by the ratio 1:2:3 from the northern central Red Sea to its southern part and further south to the Gulf of Aden. For size structure analysis samples were fractionated into three size classes (100 to 300, 300 to 500, 500 to 5000 μm). In the central Red Sea the smallest size was dominant whereas in the Gulf of Aden the largest size fraction played a greater relative role than in the central Red Sea. This shift in size structure of the zooplankton community from the Red Sea to the Gulf of Aden is apparently primarily related to ecosystem difference between both areas, leading to a change in species composition. In addition, size reduction of individual species common to both seas may be of some significance in the extreme environment of the Red Sea.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1007/BF00349556
    Location Call Number Limitation Availability
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    OceanRep: Article in a Scientific Journal - peer-reviewed
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