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  • 1985-1989  (6)
  • 1970-1974  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Fecundity of a euphasiid crustacean, Nematoscelis difficilis, in the North Pacific Ocean (1972)
    Springer
    Marine biology 14 (1972), S. 41-47 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The number, size, and carbon and nitrogen contents of eggs in the pouches of a euphausiid crustacean, Nematoscelis difficilis Hansen, were examined. A clear linear relationship exists between the number of eggs in the pouch and the body weight of the maternal euphausiid. The eggs are not spherical in shape, and the size of eggs is greater in larger egg masses. The carbon content of the egg masses (50.2%) is higher than that of the bodies (40.7%). The carbon: nitrogen ratio (C/N) is also higher in the egg masses than in the bodies of euphausiids. The carbon content of the eggs is equivalent to 28.4% of the body carbon, the nitrogen content to 19.2% of the body nitrogen.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00365779
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Ecological aspects of deformed chaetognaths and visual observations of their periphytes (1985)
    Springer
    Marine biology 87 (1985), S. 67-75 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Preserved samples of chaetognaths (Sagitta crassa) in Tokyo Bay contained normal specimens and knotty and flabby deformed ones. On the body surfaces of both normal and deformed specimens, three different types of periphyte were observed by a scanning electron microscope (SEM): branch-like growths, large numbers of filaments and protuberances. Some branch-like growths frequently covered almost the entire body of even normal chaetognaths. Bacteria were only observed on the abnormal specimens. Bacterial colonization occurred inside the body rather than on the body surface. Due to the growth of bacteria, muscles degenerated and chaetognaths became abnormally knotty and flabby. Abnormal chaetognaths occurred in Tokyo Bay more frequently in July 1979 (12.4%) than in June 1982 (3.9%). Food containing ratio (FCR) values, an indication of feeding activity, of the abnormal chaetognaths were less than 10% and no feeding rhythm was found, whereas normal chaetognaths had high FCR values with a maximum peak (more than 60%) between 20.000 and 23.000 hrs. Abnormal specimens sometimes had spermatophores on their body surfaces. It is obvious that abnormal chaetognaths had still been alive in the sea and that some of them not only fed on copepods but also copulated. However, feeding activity and reproductive behaviour were far lower in abnormal chaetognaths than in normal ones. Abnormal specimens were not larger than 9.0 mm and their mean body length was smaller than that of normal chaetognaths. This suggests that bacterial infection directly affects the mortality of the chaetognath population.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00397007
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Scanning electron microscopy investigation of bacterial colonization of the marine copepod Acartia clausi (1985)
    Springer
    Marine biology 87 (1985), S. 61-66 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Association between copepods and bacteria was observed in many scanning electron micrographs. Particular sites on the copepods were selectively colonized by bacteria; the joints of segments and legs, swimming legs and depressed parts of the body surface were found to be densely covered with bacteria. In comparison, bacterial attachment to copepod skeletons in fecal pellets excreted by chaetognaths was not selective; bacteria were sparsely found all over the copepod. Between 9 to 30% of copepods in Tokyo Bay waters had attached bacteria in January and April 1983.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00397006
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  • 4
    Electronic Resource
    Electronic Resource
    Morphology of the gastric mill in ten species of euphausiids (1988)
    Springer
    Marine biology 97 (1988), S. 79-85 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract SEM observation revealed the detailed morphology of the gastric mill in ten species of euphausiids, Bentheuphausia amblyops, Thysanopoda acutifrons, Meganyctiphanes norvegica, Pseudeuphausia latifrons, Euphausia superba, Tessarabrachion oculatum, Thysanoessa longipes, Nematoscelis microps, Nematobrachion boopis, and Stylocheiron maximum. The well-developed gastric mill of euphausiids consists of a pair of cluster spines and a pair of lateral teeth displaying great diversity in morphology. It is suggested that there are three categories of gastric mill and filterpress (gland filter) within euphausiids. One is the well-developed gastric mill with filter-press of B. amblyops; a second is the well-developed gastric mill of M. norvegica, T. oculatum, E. superba, P. latifrons and T. longipes; and the third is the gastric mill without lateral teeth of T. acutifrons, N. microps, N. boopis and S. maximum.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00391247
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  • 5
    Electronic Resource
    Electronic Resource
    The diet of mesopelagic fish from the Pacific coast of Hokkaido, Japan (1985)
    Springer
    Journal of oceanography 41 (1985), S. 89-97 
    Details
    ISSN: 1573-868X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract The diet of at least 28 species of mesopelagic fish from the Pacific coast of Hokkaido was examined. The dominant family was the Gonostomatidae (42%) which was represented by five species. The most abundant species wasCyclothone atraria which together with the other species of this genus preyed predominantly on copepods. Euphausiids and copepods were dominant in the diet ofGonostoma gracile. The next most abundant family was the Myctophidae (32%) which was represented by seven species. The dominant species,Stenobrachius nannochir, preyed mainly on copepods. Copepods were also the dominant food item of the other myctophids except forLampanyctus jordani which fed mainly on euphausiids. The other important family was the Bathylagidae (21%).Leuroglossus schmidti was the dominant species and its diet was more diverse with ostracods, copepods, molluscs and larvaceans being the most important food items.Bathylagus ochotensis had a similar diet. Copepods were the most important food items for all but a few species and their occurrence in the fish stomachs was related to the known vertical distribution of both predators and prey. Ostracods and euphausiids were also important prey items, the latter especially in large fish species. Molluscs and larvaceans were restricted to the two species of the family Bathylagidae.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02109178
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Portable device for monitoring oxygen uptake (1986)
    Springer
    Medical & biological engineering & computing 24 (1986), S. 186-192 
    Details
    ISSN: 1741-0444
    Keywords: Exercise ; Oxygen sensing ; Oxygen uptake ; Respiration
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02443934
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  • 7
    Electronic Resource
    Electronic Resource
    Improved probe for a deep body thermometer (1988)
    Springer
    Medical & biological engineering & computing 26 (1988), S. 456-459 
    Details
    ISSN: 1741-0444
    Keywords: Body temperature ; Deep body thermometer ; Sublingual temperature ; Zero heat-flow method
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02442312
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