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  • 1
    Electronic Resource
    Electronic Resource
    Pigments of meso- and bathypelagic chaetognaths (1977)
    Springer
    Marine biology 41 (1977), S. 119-125 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Pigments of the meso- and bathypelagic chaetognaths Sagitta macrocephala and Eukrohnia fowleri were studied by chromatographic analysis. Supplementary histological studies were also performed. Fat-soluble properties and absorption spectra of the chaetognath pigments indicated that all pigments were carotenoid, independent of chaetognath species or habitat. The major carotenoid in chaetognaths was very soluble in nonpolar solvents such as carotenes, although its absorption spectrum formed a single broad peak at around 460 nm. The characteristics of the carotenoids in the chaetognaths were different from those of the pigments in the plankton which formed their diet. It is therefore inferred that carotenoids in chaetognaths are not formed by the deposition of food pigments in the intestinal tissue, but are synthesized by the chaetognaths themselves.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00394019
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Larval development of Euphausia nana (Crustacea: Euphausiacea) (1984)
    Springer
    Marine biology 81 (1984), S. 311-322 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The larvae of Euphausia nana Brinton in Sagami Bay and Suruga Bay, Central Japan, are described and illustrated. The furcilia stage is separated into six stages on the basis of the form of the pleopods and the number of terminal telson spines. Furcilia I, no pleopod or non-setose pleopods and seven terminal telson spines. Furcilia II, nonsetose and setose pleopods and seven terminal telson spines. Furcilia III, five pairs of setose pleopods and seven terminal telson spines. Furcilia IV, five pairs of setose pleopods and five terminal telson spines. Furcilia V, five pairs of setose pleopods and three terminal telson spines. Furcilia VI, five pairs of setose pleopods and one terminal telson spine. Segmentation of the antennal endopod and mandible palp occurred at the furcilia V stage. The dominant forms of early furcilia larvae of E. nana differed during different seasons of the year. The total lengths of calyptopis III and furcilia I to VI larvae also showed seasonal changes; they were largest in May and smallest from September to December.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00393226
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Vertical distribution of larvae of Euphausia nana and E. similis (Crustacea: Euphausiacea) in Sagami Bay and Suruga Bay, Central Japan (1984)
    Springer
    Marine biology 81 (1984), S. 131-137 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Vertical distributions of the larval stages of Euphausia nana Brinton and E. similis G. O. Sars in Sagami Bay and Suruga Bay, Central Japan were studied. Most of the metanauplius larvae of E. nana occurred between 25 and 80 m depth, and they were found at greater depths than the eggs and calyptopis larvae. The nauplii and metanauplii of e. similis were mainly found between 50 and 100 m depth, and they also occurred deeper than the eggs and calyptopes. The larvae of the two species from calyptopis I demonstrate diurnal vertical migration. However, this phenomenon was not clear in the season (March) when a seasonal thermocline was absent. Calyptopes and fruciliae of E. similis occurred deeper and migrated over greater vertical distances than those of E. nana. The distance of migration of furcilia I larvae of E. similis was estimated to be about 200 m.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00393111
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Integumental sensilla of pelagic decapod crustaceans (1977)
    Springer
    Marine biology 43 (1977), S. 149-155 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Integumental sensilla were examined in 39 species of meso- and bathypelagic shrimps and 6 species of epibenthic shrimps. A tuft organ, consisting of a group of openended, tubular setae and so probably functioning as a chemosensor, is described. A single tuft with ancillary smaller tufts occur on the dorsal median surface of the fourth abdominal segment and two pairs of tufts occur on the proximal dorsal region of the telson of all oplophorid and pandalid shrimps examined. An additional tuft is present on the fifth abdominal segment of the rare bathypelagic Physetocaris microphthalma Chace. No tuft organs were identified in Processa canaliculata Leach, suggesting that they may not occur in all families of caridean shrimps. Acanthephyrid, systellaspid and pandalid shrimps have the integument completely covered by scales. These are extremely delicate and are normally removed during the process of catching the shrimp through abrasion of the integument by the net. The scales are peculiarly orientated, pointing anteriorly in the anterior half and posteriorly in the posterior half of the body. They probably have a sensory function as distance receptors, monitoring water currents and disturbances in the environment surrounding the shrimp.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00391262
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Biological oceanography (1971)
    Springer
    Journal of oceanography 27 (1971), S. 275-286 
    Details
    ISSN: 1573-868X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02109746
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    Paper (German National Licenses)
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