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  • OceanRep  (6)
  • 1990-1994  (3)
  • 1985-1989  (3)
  • 1920-1924
  • 1
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    Population dynamics and the trophic role of Aurelia aurita medusae in the Kiel Bight and western Baltic (1994)
    Oxford Univ. Press
    In:  ICES Journal of Marine Science, 51 (4). pp. 359-367.
    Details
    Publication Date: 2018-08-10
    Description: The population dynamics and the trophic role of Aurelia aurita medusae in the Kiel Bight/western Baltic are described from nine years of investigation between 1978 and 1993. There is considerable yearly variation in standing stock with summer median abundance ranging from 0.2 to 16 ind. 100 m−3 and biomass from 0.2 to 4.4 g C 100 m−3. The lower variation is due to marked differences in size of adult medusae between years. In years of low abundance medusae exhibit an average dise diameter of about 30 cm and weight about 1 kg. In bloom years, however, adult size is only about 20 cm and weight ranges between 200 and 400 g. Estimates of feeding are somewhat contradictory, but feeding rates of 40–80 mg C ind.−1 day−1 seem probable. It can be concluded that Aurelia medusae consume about 2/3 of daily secondary production in years of high abundance, and are thus responsible for a decline of mesozooplankton in these years.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1006/jmsc.1994.1038
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 2
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    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
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 3
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    A comparison of summer nutrient data obtained in Königshafen Bay (North Sea, German Bight) during two investigation periods: 1979-1983 and 1990-1992 (1994)
    AWI / Springer
    In:  Helgoländer Meeresuntersuchungen, 48 . pp. 173-182.
    Details
    Publication Date: 2018-08-09
    Description: A comparison of summer nutrients obtained during the investigation periods 1979–1983 and 1990–1992 was made, to elucidate whether or not changes have occurred in Königshafen Bay during the last decade. In both the flood current as well as in the ebb current, concentrations of silicate, phosphate, nitrite and nitrate have decreased. Ammonia, however, has increased by a factor of two in the flood current waters, but was similar in both investigation periods in the ebb current waters. In addition, a significant increase of salinity has been observed. The differences between flood and ebb current median nutrient concentrations suggest that the bay was a source of nutrients during the 1979–1983 period, exporting large amounts of silicate, nitrite and ammonia with the ebb current. Today, the bay appears to be more a sink than a source of nutrients. Export rates of silicate and nitrite are greatly reduced and phosphate and ammonia are imported nowadays. Nitrate fluxes were in balance during both periods. Reasons for the observed changes are discussed.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1007/BF02367034
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 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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    Larvae production of the common jellyfish Aurelia aurita in the Western Baltic 1982-1984 (1988)
    Institut für Meereskunde
    Details
    Publication Date: 2022-06-02
    Description: During 1982, 1983 and 1984 numbers of planulae within the oral arms of the common jellyfish Aurelia aurita were counted, and the organic content of the larvae was determined through C/N analysis. The total numbers of larvae produced by females of the same size increased during the period of investigation by a factor of 4-5, and a good linear correlation between the amount of larvae and body weight of the females were observed. In contrast, the averaged carbon content of the planulae decreased from 0.68 µg C per individual in 1982 to 0.28 µg C per individual in 1984. On average, larvae represented 17% of the carbon content of a female in 1982, 25% in 1983 and 37% in 1984. Partitioning of this organic matter among larvae differed from year to year: low numbers of planulae with a high organic content were observed in 1982, very high numbers with a low organic content in 1984, and intermediate in 1983. Thus breeding behaviour of the common jellyfish seems to be a complex process and there is evidence that medusae abundance and estimated food availability ragulate reproduction in Aurelia aurita populations.
    Type: Article , NonPeerReviewed
    Format: text
    Location Call Number Limitation Availability
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    OceanRep: Article in a Scientific Journal - without review
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