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  • Other Sources  (192)
  • Springer  (109)
  • Institut für Meereskunde  (70)
  • AMS (American Meteorological Society)
  • Institute for Advanced Sustainability Studies (IASS)
  • PANGAEA
  • 1985-1989  (192)
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Source
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Year
  • 1
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    Methodische Ansätze zur Biomassebestimmung mittels biochemischer Parameter und der computergestützten Bildanalyse (1989)
    Institut für Meereskunde
    Details
    Publication Date: 2023-10-20
    Type: Report , NonPeerReviewed
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  • 2
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    Sedimentphysikalische Eigenschaften aus dem Europäischen Nordmeer (Datenreport F.S. Meteor, Reise 7) (1989)
    Institut für Meereskunde
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    Publication Date: 2023-10-20
    Type: Report , NonPeerReviewed
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  • 3
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    A survey of botanical investigations of the waters of the Soviet Baltic in the 19th century and in the first half of the 20th century (1988)
    Institut für Meereskunde
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    Publication Date: 2022-06-02
    Type: Article , NonPeerReviewed
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  • 4
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    Primary production in the Southern Baltic in 1985 and 1986 compared with long-term mean seasonal variation (1988)
    Institut für Meereskunde
    Details
    Publication Date: 2022-06-02
    Description: On the basis of long-term investigations, the course of seasonal variations of mean daily primary production and mean chlorophyll-a concentration in the Southern Baltic waters are presented. The mean annual primary production of the Gdańsk Deep, Bornholm Deep and the Gotland Deep amounted to 124.4 gC m-2, 88.8 gC m-2 and 107.2 gC m-2, respectively. The primary production of the Southern Baltic in 1986 was higher than in 1985, and higher than the long-term mean value. The mean annual production for the Southern Baltic in 1986 amounted to 130 gC m-2. On the basis of long-term observations of primary production and chlorophyll-a of the Southern Baltic, certain upward trends in phytoplankton production were observed.
    Type: Article , NonPeerReviewed
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  • 5
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    Nutrient turnover at the sediment/water interface in shallow eutrophic coastal waters (1988)
    Institut für Meereskunde
    Details
    Publication Date: 2022-06-02
    Description: The nutrient situation in eutrophic shallow coastal water systems is characterized by particular features. In addition to water exchange with the open sea, interactions at the sediment/water interface play a significant role. With the help of investigation on phosphate sorption/desorption balances and on the denitrification capacity of shallow coastal waters, the following general conclusions can be made: The phosphate concentrations in the water are primarily determined by physico-chemical reactions with the sediment, and less by the rhythm of the phytoplankton primary production. Through intensive interactions between sediment and water, a phosphate "equilibrium" concentration which fluctuates very little is maintained over the whole year. High primary production rates are possible at these low equilibrium concentrations of phosphate. The phosphate sorption capacity of sediments is a characteristic parameter of shallow systems. Sediments with a high organic matter content exhibit the highest phosphate sorption capacities. With the development of nearly anearobic conditions, nitrate reduction can occur at a rate, when the appropriate amount of nitrate is made available to the reaction. Under optimal conditions for nitrate reduction, nitrate concentration is also not a parameter characterizing the nature of the water body.
    Type: Article , NonPeerReviewed
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  • 6
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    The history of marine mycological research in the Baltic Sea (1988)
    Institut für Meereskunde
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    Publication Date: 2022-06-02
    Type: Article , NonPeerReviewed
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  • 7
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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
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  • 8
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    Energy content in relation to the population dynamics of Mysis mixta (Lilljeborg) from the Southern Baltic (1988)
    Institut für Meereskunde
    Details
    Publication Date: 2022-06-02
    Description: The energy content of Mysis mixta from the Southern Baltic in relation to its body weight was studied in June, August and October 1986, and April and May 1987. In June, immature animals (4-13 mm) and adult females (18-25 mm) dominated. The same composition was found in August, although the size had changed: the immature animals ranged from 10 to 21 mm and adult females from 21 to 30 mm. A more homogeneous population ranging from 12 to 22 mm was found in October. Males occurred in large numbers only in autumn. The dry weight was 15.04 % of the wet weight, and included 8.18% ash. The relationship between dry weight and body length fitted the power function W = 0.714 L2.835. The average energy content of M. mixta was high: 24.748 Jmg-1 OW and 27.055 Jmg-1 AFDW.There was no significant difference in energy content between adult females and males in October, when both sexes were present. Energy content per dry weight increased with the size of the animals. M. mixta obtained in the study area showed similar energy content to each other.
    Type: Article , NonPeerReviewed
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  • 9
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    Effect of the detergent alkylbenzene sulphonate (ABS) on hepatopancreas of the shrimp Crangon crangon L. (1988)
    Institut für Meereskunde
    Details
    Publication Date: 2022-06-02
    Description: Shrimps Crangon crangon L., acclimated in the laboratory for 24 h in brackish water (7‰ salinity), were incubated in solutions of anionic detergent alkylbenzene sulphonate (ABS) in concentrations of 5 - 50 ppm. After 24 h or 96 h of incubation, preparations of hepatopancreas were stained and examined by light or transmission electrone microscopy. The light microscopy examination revealed a flattening of the duct cells, pyknotic nuclei in these cells, fine granular secretions in the ducts of the gland, and cellular infiltration. The transmission electron microscopy examination revealed an impairment and destruction of the lysosomal and mitochondrial membranes of the hepatopancreas cells in the shrimps exposed to alkylbenzene sulphonate.
    Type: Article , NonPeerReviewed
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  • 10
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    Simulated eutrophication in enclosure experiments in the Arkona Sea (1988)
    Institut für Meereskunde
    Details
    Publication Date: 2022-06-02
    Description: In spring, summer and autumn enclosure experiments were performed in the central part of the Arkona Sea. The natural water with the plankton community was enriched by nutrients to about winter levels, and to the double of these concentrations. In spring and summer, the phytoplankton responded with rapid uptake of nutrients and an increase in primary production and biomass. In autumn, the uptake of nutrients was also fast, whereas productivity did not increase, and biomass only in diatoms. Not only did the production increase with higher nutrient supply, but also the productive season was prolonged. This fact is of importance for the function of the pelagic system in the Baltic, because the biomass and nutrients remaining after the spring bloom determine to a great extent the productivity of the whole year.
    Type: Article , NonPeerReviewed
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