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  • Other Sources  (48)
  • Springer  (47)
  • Blackwell Publishing Ltd
  • Wiley-Blackwell
  • 1980-1984  (47)
  • 1935-1939  (1)
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Year
  • 1
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    Luminescent flashing in the midwater squids Pterygioteuthis microlampas and P. giardi (1982)
    Springer
    In:  Marine Biology, 69 (3). pp. 299-308.
    Details
    Publication Date: 2020-07-14
    Description: The luminescent flashing capabilities and swimming behavior were examined for two species of small midwater squids (Pterygioteuthis microlampas and P. giardi). Recently captured squid were placed in a small aquarium, where their movements and luminescent flashes could be recorded with an image intensifier, a photomultiplier tube and associated equipment. Flashing behavior was initiated by disturbing the squid with an electrical shock. The following 4 behaviors were observed: (1) a short flash and a rapid departure from the electrode; (2) a short flash and a delayed, slow departure from the electrode; (3) a longer flash persisting after a rapid departure from the electrode; (4) a longer flash when departure was prevented by continuing the shock. Luminescent flashes probably have a general defensive function, discouraging or disrupting an attack by potential predators, and within this context there may exist numerous strategies involving flashes.
    Type: Article , PeerReviewed
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  • 2
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    Is Nautilus a Living Fossil? (1984)
    Springer
    In:  In: Living Fossils. Springer, Californien, pp. 247-256.
    Details
    Publication Date: 2019-04-02
    Description: The two quotes above are representative of the controversy concerning the age of Nautilus, the last externally shelled cephalopod. If we accept the first age estimate, we would have to include Nautilus as a living fossil, the end member of a clade that has survived for a long time and undergone little morphologic change.
    Type: Book chapter , PeerReviewed
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  • 3
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    The fluffy sea anemone Metridium senile in periodically oxygen depleted surroundings (1984)
    Springer
    In:  Marine Biology, 81 (1). pp. 81-86.
    Details
    Publication Date: 2014-01-23
    Description: In SCUBA-diving monitored field experiments (Flensburg Fjord, 15 m, 1981) and parallel aquarium tests,the behavior of Metridium senile under anoxic conditions and its oxygen-deficiency resistance were studied. When oxygen is lacking the fluffy sea anemone diminishes body surface, and then, successively, shuts off most energy consuming activities. By means of this strategy, 50% of the tested individuals survived 3 weeks of total anoxia
    Type: Article , PeerReviewed
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  • 4
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    Towards a phylogeny of phototrophic purple sulfur bacteria - the genus Ectothiorhodospira (1984)
    Springer
    In:  Archives of Microbiology, 137 (4). pp. 366-370.
    Details
    Publication Date: 2016-01-22
    Description: Seven strains of five species of the genus Ectothiorhodospira were characterized by oligonucleotide cataloguing of their 16S rRNA in order to determine the phylogenetic relationship to one another and to other phototrophic purple bacteria. All representatives of Ectothiorhodospira are members of that line of descent defined by phototrophic purple sulfur bacteria and relatives, showing a moderate relationship to those phototrophic organisms forming globules of elemental sulfur inside the cell (Chromatium and relatives). The 5 Ectothiorhodospira species fall into two subgroups. E.halophila, E. halochloris and E. abdelmalekii form one, E. mobilis, E. shaposhnikovii and the unnamed strain BN 9906 form the second subgroup. Within the two subgroups the strains are closely related, while the degree of relatedness found between members of the two subgroups is more distant.
    Type: Article , PeerReviewed
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  • 5
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    Comparison of potential growth rates of Ceratium hirundinella with observed population density changes (1984)
    Springer
    In:  Hydrobiologia, 109 (2). pp. 159-164.
    Details
    Publication Date: 2018-06-29
    Description: Ceratium hirundinella cells in Lake Constance divided during the second half of the night. Growth rates are calculated from the fraction of cells undergoing cell division. Potential growth rates are compared with observed changes in population density. The discrepancy between both is discussed as a possible function of fungal parasitism.
    Type: Article , PeerReviewed
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  • 6
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    Algal nutrient competition in continuous culture (1983)
    Springer
    In:  Hydrobiological Bulletin, 17 (1). pp. 21-27.
    Details
    Publication Date: 2018-07-02
    Description: Natural phytoplankton from Lake Constance was exposed to competition experiments in continuous culture at 6 different molar rations of PratioSi as potentially limiting nutrients. As predicted by theory there was competitive exclusion of all species but one at single nutrient limitation, and coexistence of two species in steady state when P was limiting for one and Si for the other species. In one case coexistence of three species occurred. Equilibrium species composition, which stabilized after 3 to 6 weeks of cultivation, was independent of the species composition of the inoculum and only controlled by the nutrient regime. Comparability of experimental results and field observations is discussed.
    Type: Article , PeerReviewed
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  • 7
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    Biology of Octopus vulgaris off the east coast of South Africa (1981)
    Springer
    In:  Marine Biology, 65 (1). pp. 1-12.
    Details
    Publication Date: 2021-05-05
    Description: The biology of Octopus vulgaris Cuvier inhabiting subtropical littoral reefs off the east coast of South Africa was investigated. Analyses of stomach contents and lair middens revealed that the mussel Perna perna was the dominant food organism. Growth rate of captive individuals was higher than has previously been recorded but food conversion was lower. Females became sexually mature at 900 g which is estimated to be attained in 3.6 months. Males became sexually mature at 400 g, which is estimated to be attained after 3 months. Results indicate that females live for 9–12 months and have the potential to reach 4 000 g in 240 d while males live for about 12–15 months and have the potential to achieve 4 000 g in 290 d. Mating and breeding occurred throughout the year although evidence for the seasonal migration of females is presented and discussed in relation to breeding and feeding behaviour.
    Type: Article , PeerReviewed
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  • 8
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    Tropical and equatorial regions (1983)
    Springer
    In:  In: Eddies in marine science. , ed. by Robinson, R. A. Springer, New York, USA, pp. 181-199.
    Details
    Publication Date: 2013-01-15
    Type: Book chapter , NonPeerReviewed
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  • 9
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    Stratigraphie rezenter Tiefseesedimente auf Grund der Foraminiferenfauna (1938)
    Springer
    In:  Geologische Rundschau, 29 (3). pp. 330-333.
    Details
    Publication Date: 2016-06-15
    Description: Kurzer Bericht über den Vortrag auf der Versammlung der Geologischen Vereinigung in Frankfurt a. M. am 8. Jan. 1938.
    Type: Article , PeerReviewed
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  • 10
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    Transmission of the oceanic chlorophyll fluorescence to the top of the atmosphere (1984)
    Springer
    In:  Deutsche Hydrographische Zeitschrift, 37 (2). pp. 57-69.
    Details
    Publication Date: 2019-09-23
    Description: Radiative transfer modelling for a coupled ocean-atmosphere system near 685 nm indicates a sufficiently high fluorescence signal of the chlorophyll a transmitted to the top of the atmosphere. However, only the shortwave half is seen at the top of the atmosphere, the longwave half is fully masked by atmospheric oxygen and water vapour absorption. The impact of atmospheric aerosol extinction on the signal transmission is almost negligible. The Hα line of the sun, atmospheric water vapour absorption, and chlorophyll absorption near 670 nm influence radiative transfer in the shortwave tail of the fluorescence line making the search for a baseline in order to eliminate the background radiation a difficult task.
    Type: Article , PeerReviewed
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