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  • Springer  (436,448)
  • 1980-1984  (224,281)
  • 1970-1974  (177,357)
  • 1950-1954  (34,810)
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Years
Year
  • 1
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    Deep-Sea Carbonates (1974)
    Springer
    Details
    Publication Date: 2023-11-24
    Description: Calcium carbonate in sediments can greatly effect the engineering properties of those sediments. Factors that may effect engineering properties are: 1) great variation in primary void ratios, (2) inherent strength of carbonate grains, (3) degree of sorting, (4) ratio between grains and matrix, (5) nature and amount of cement, and (6) depth of burial. Deep-sea carbonates appear to be anomalous but do exist in rather large quantities. Their existence must depend upon a combination of physico-chemical and organic-chemical factors that need to be investigated in much more detail.
    Type: Book chapter , NonPeerReviewed
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  • 2
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    Untermeerische mineralische Rohstoffe in den Ozeanen (1974)
    Springer
    Details
    Publication Date: 2022-03-10
    Description: Mineral resources on and beneath the seafloor are briefly reviewed and the present and future economic value of specific mineral resources is discussed. The results obtained from the cruises of the German research vessel "Valdivia" during its first three years of operation are presented.
    Type: Article , PeerReviewed
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  • 3
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    On the architecture and function of cuttlefish bone (1983)
    Springer
    In:  Journal of Materials Science, 18 (7). pp. 2081-2086.
    Details
    Publication Date: 2021-08-02
    Description: The internal shell of the cuttlefish, which acts as a rigid buoyancy tank, is structured to combine high compressive strength — since it must withstand the external hydrostatic pressure — with minimum weighT. The micro-architecture of cuttlebone has been examined by electron microscopy and the relevance of the structure to the mechanical duties required of the shellin vivo are briefly discussed. The inorganic calcareous structure is associated with an organic component which may act as a template for mineralization.
    Type: Article , PeerReviewed
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  • 4
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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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  • 5
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    Reproductive biology and embryonic development of Eledone cirrosa (Cephalopoda: Octopoda) (1971)
    Springer
    In:  Marine Biology, 8 . pp. 109-117.
    Details
    Publication Date: 2020-11-05
    Description: Analyses of bottom trawl samples and feeding experiments in the laboratory revealed a reproduction period ranging from late March to early August in Eledone cirrosa of the Catalonian Sea (Western Mediterranean). The embryonic development, studied for the first time on eggs laid in the laboratory, shows no basic difference from that of other Octopodiae. The newly hatched animals are planctonic; Morphologically, this feature is expressed by a relatively small arm-length.
    Type: Article , PeerReviewed
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  • 6
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    Laboratory rearing of Sepiolinae (Mollusca: cephalopoda) (1971)
    Springer
    In:  Marine Biology, 8 . pp. 82-87.
    Details
    Publication Date: 2020-11-05
    Description: Five species of Sepiola were reared in the laboratory from egg to adult size. Spawning was achieved in 3 species of Sepiola afteer 5 to 7 months. The growth rate of the species reared did not depend upon temperature, which ranged from 12,5° to 20°C. A fairly constant size increase (2,5mm mantle length/month) was observed in Sepiola during the 5 months after hatching. In Sepietta, the same growth rate was observed until the fourth month after hatching, when it increased to the rate of 5 mm mantle length/month.
    Type: Article , PeerReviewed
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  • 7
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    New data on reproductive biology and growth of Octopus vulgaris (1973)
    Springer
    In:  Marine Biology, 19 . pp. 7-12.
    Details
    Publication Date: 2020-11-05
    Description: The problems of reproduction of Octopus vulgaris and the seasonal distribution in the sea of planctonic larvae, benthonic juveniles and adults are discussed. The influence of environmental factors on growth is shown by experimental studies in the laboratory, and the difficulties of interpreting field data are emphazised.
    Type: Article , PeerReviewed
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  • 8
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    Über stratigraphische Untersuchungsmethoden in rezenten Tiefseesedimenten (1954)
    Springer
    In:  Heidelberger Beiträge zur Mineralogie und Petrographie, 4 (1-2). pp. 192-197.
    Details
    Publication Date: 2020-07-30
    Description: Durch Bestimmung der Foraminiferenanzahl in I g Sediment wird die biostratigraphische Untersuchungsmethode, die mittels einer qualitativen und quantitativen Erfassung der Foraminiferenfauna in den Tiefseekernen der deutschen „Meteor”-Expedition und schwedischen „Albatroß”-Expedition durchgeführt werden ist, auf ihre Richtigkeit hin geprüft. Die Untersuchung hat die Anwendbarkeit dieser stratigraphischen Methode bestätigt. Sie hat daneben wiederum gezeigt, daß die Verbreitung und Entwicklung der einzelnen Foraminiferenarten vor allem von der Temperatur des Meerwassers abhängig sind; andere Faktoren wie Phosphatgehalt des Wassers usw. scheinen in dieser Hinsicht eine mehr untergeordnete Rolle zu spielen. Unter gewissen Voraussetzungen können Tiefseekerne durch Bestimmung der Foraminiferenanzahl je 1 g Sediment in groben Zügen stratigraphisch gegliedert werden; auch kann die Individuenanzahl der einzelnen Foraminiferenarten aus der Foraminiferenanzahl in 1 g Sediment und aus der prozentualen Zusammensetzung der Gesamtfauna errechnet werden. Mit den hier gewonnenen Erkenntnissen wird versucht, die engen Bezichungen zwischen dem prozentualen Anteil der Warmwasserforaminiferen in der Gesamtfauna und dem CO2-Gehalt des Sedimentes, dieOvey im Kern 241 der schwedischen „Albatroß”-Expedition beobachtet hat, zu deuten.
    Type: Article , PeerReviewed
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  • 9
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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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  • 10
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    Chemical and structural characteristics of statoliths from the short-finned squid Illex illecebrosus (1983)
    Springer
    In:  Marine Biology, 76 (1). pp. 47-54.
    Details
    Publication Date: 2020-07-14
    Description: Statoliths of the short-finned squid Illex illecebrosus were chemically analyzed to define their chemical composition and surveyed by scanning electron microscope to differentiate internal structural patterns. X-ray diffraction data demonstrated that L Illecebrosus statoliths were composed principally of CaCQ in the aragonite crystal form. The crystals occurred in a protein matrix to form incremental patterns which radiated from the nucleus to the edge of the statoliths. The protein matrix comprised approximately 5% of the statolith by weight. The protein was principally composed of acidic amino acids. A high abundance of aspartic acid in the protein matrix indicated that the matrix would function as a template in the initiation and acceleration of the crystal growth of CaCO. The rhythmic microstructural patterns, constructed of aragonite crystals in the protein matrix, wer e suggested to be daily in formation and subsequent growth estimations were in agreement with known life history information. The stable isotopic composition of the carbonate of L illecebrosus statoliths suggested that oxygen may be deposited in isotopic equilibrium with the surrounding environment while carbon appeared to be related to biological processes. The information recorded in the statotiths as incremental growth and stable isotopic composition could provide valuable insights into the ecological history of squid.
    Type: Article , PeerReviewed
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