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  • Weitere Quellen  (76)
  • Taylor & Francis  (41)
  • Nature Publishing Group  (22)
  • Cambridge University Press
  • Molecular Diversity Preservation International
  • 2020-2023
  • 2005-2009  (33)
  • 1990-1994  (43)
  • 1970-1974
  • 2009  (33)
  • 1993  (21)
  • 1991  (22)
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  • 2020-2023
  • 2005-2009  (33)
  • 1990-1994  (43)
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  • 1
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    Fracture of Brittle Solids (1993)
    Cambridge University Press
    In:  Cambridge, Cambridge University Press, vol. 34, no. 22, pp. 65-70, (ISBN 0-691-12183-4, 2005 (481 pp. + CD-ROM))
    Details
    Publikationsdatum: 1993
    Schlagwort(e): Textbook of geophysics ; Textbook of geology ; Rock mechanics ; Physical properties of rocks ; Fracture
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    BIBLIOGRAFIE SEISMOLOGIE
  • 2
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    Sexual reproduction in four Caribbean commercial sponges. II. Oogenesis and transfer of bacterial symbionts (1991)
    Taylor & Francis
    In:  Invertebrate Reproduction & Development, 19 (1). pp. 13-24.
    Details
    Publikationsdatum: 2017-02-01
    Beschreibung: Oogenesis in four commercial Caribbean sponge species, Hippospongia lachne, Spongia barbara, S. cheiris and S. graminea, was studied using light and transmission electron microscopy. Eggs and embryos develop asynchronously in localized endosomal nurseries of these viviparous and gonochoristic species. Statistical analyses of specific morphological characteristics of reproductive elements have unequivocally identified four specific stages in the process of oogenesis. Oogonia undergo mitotic division to produce primary oocytes. Meiotic division occurs producing secondary oocytes which are fertilized before zygotes undergo major growth by phagocytosis and the transfer of nutrients through cytoplasmic bridges. During cleavage of the zygote, umbilici form between embryos and nurse cell layers and these function in the transfer of symbiotic bacteria and other mesohyl substances from the maternal parent to the embryo. These symbionts were observed dispersed between blastomeres of all young and maturing embryos and between internal cells of cytodifferentiated parenchymella larvae. Extracellular transfer of symbiotic bacteria from maternal tissues to developing embryos has not been reported in any other viviparous invertebrate.
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    ARTIKEL (OCEANREP)
  • 3
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    Distribution and morphological characters of immature Martialia hyadesi (Cephalopoda: Oegopsida) in New Zealand waters (1991)
    Taylor & Francis
    In:  New Zealand Journal of Marine and Freshwater Research , 25 . pp. 275-282.
    Details
    Publikationsdatum: 2020-06-22
    Beschreibung: Before 1985, Martialia hyadesi (Cephalopoda: Ommastrephidae) in the Pacific Ocean was known only from the Eltanin Fracture Zone and Macquarie Island. A joint Japan‐New Zealand squid survey around New Zealand captured many immature ommastrephid squids. Gel electrophoresis confirmed the presence of immature M. hyadesi. Aspects of the external morphology are described. The distinctive tentacle club was evident in the smallest specimen examined, 19 mm dorsal mantle length (ML). Arm trabeculae were first evident in specimens of 40–50 mm ML. Immature squid were distributed around and southward of the Subtropical Convergence Zone. The presence of very small squid (〈 10 mm ML) indicated spawning on or near the Auckland Island Shelf.
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  • 4
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    Cephalopods of the Benguela Current off Namibia: new additions and considerations on the genus Lycoteuthis (1993)
    Taylor & Francis
    In:  Journal of Natural History, 27 (1). pp. 15-46.
    Details
    Publikationsdatum: 2020-07-21
    Beschreibung: The present study contributes new information on the cephalopods off Namibia, contains the first record of Ornithoteuthis volatilis (Sasaki, 1915) in the Atlantic, and adds records of six species in the Benguela Current and three species in Namibian waters. The presence of certain species seldom encountered in the Benguela Current has been confirmed. A compilation of the cephalopod fauna off Namibia had also been included, listing 65 species. Additional morphological data on Stoloteuthis leucoptera, Lycoteuthis lorigera, Architeuthis sp., Pholidoteuthis boschmai, Ornithoteuthis volatilis, Eledone nigra, and Graneledone sp. have been provided. The status of the genus Lycoteuthis has been reviewed in the light of the first collection of Lycoteuthis lorigera (Steenstrup, 1875) males in the Atlantic, and Lycoteuthis diadema (Chun, 1900) has been considered to be a synonym for Lycoteuthis lorigera
    Materialart: Article , PeerReviewed
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  • 5
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    Food of striped dolphin, Stenella coeruleoalba, in the Ligurian Sea (1993)
    Cambridge University Press
    In:  Journal of the Marine Biological Association of the United Kingdom, 73 (03). p. 571.
    Details
    Publikationsdatum: 2020-07-16
    Beschreibung: The stomachsof 23 striped dolphins (Stenella coeruleoalba Meyen, 1833, Cetacea), stranded along the Ligurian coast (western Mediterranean Sea), contained 32 species of cephalopods, crustaceans and fishes, totalling an estimated 2,723 prey specimens representing about 36 kg in weight. Cephalopods and bony fishes were equally important in the diet (50%). Todarodes sagittatus (34.5%) and Micromesistius poutassou (25.9%) were found to be the most important food species. Other species belonging to six cephalopod families, three crustacean families and nine bony fish families, contributed to the diet with variable numbers, weights, and occurrences, demonstrating the opportunistic character of striped dolphin feeding.
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  • 6
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    An annotated list of deep-sea fishes collected in the northern Red Sea, Gulf of Aqaba (1993)
    Taylor & Francis
    In:  Israel Journal of Zoology, 39 (4). pp. 299-336.
    Details
    Publikationsdatum: 2017-08-10
    Beschreibung: During the years 1989–1993 an intensive collection of fishes from the aphotic zone (below 150 m) of the northern part of the Gulf of Aqaba was conducted. This survey recorded 69 fish species, 8 elasmobranchs, and 61 teleosts, belonging to 45 families. Fifteen species are endemic to the Red Sea: Mustelus mosis, Narcine bentuviai, Rhinobatos punctifer, Ophichthus echeloides, Rhynchoconger sp., Physiculus marisrubri, Ostichthys hypsipterygion sufensis, Pterygotrigla sp., Uranoscopus marisrubri, Parascolopsis sp.1 and sp. 2, Atrobucca geniae, Chromis pelloura, Samariscus sp., Thamnaconus modestoides erythraeensis. Eleven species are new records for the Red Sea: Gymnothorax johnsoni, Rhynchoconger sp., Synodus doaki, Pterygotrigla sp., Chelidoperca pleurospilus, Carangoides equula, Parascolopsis sp. 1 and sp. 2, Bodianus leucostictus, Paracaesio sordidus, and Samariscus sp. Two species, Cociella crocodilo and Parascolopsis eriomma, are first substantiated records for the Red Sea. None of the species recorded in this list is considered conventional deep-sea fishes. The ichthyofauna of the aphotic zone of the Gulf of Aqaba is composed of species of shallower origin.
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    ARTIKEL (OCEANREP)
  • 7
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    Shear Strength of Artificially Cemented Sands (2009)
    Taylor & Francis
    In:  Marine Georesources & Geotechnology, 27 (3). pp. 201-216.
    Details
    Publikationsdatum: 2018-04-24
    Beschreibung: In this study, a series of drained triaxial tests were performed in order to examine the effect of cementation on the shear behavior of granular soil. It was observed that the brittle nature and dilative tendency of granular soil is dominant under a low confining stress level, while high confining stress results in a contractive behavior despite the strong cementation bond. Based on experimental results, an idealized concept is suggested to define the shear strength of cemented sand in three distinctive zones: the cementation control zone with a constant cohesion intercept at a low confining stress level, the transition zone in which the cohesion intercept is gradually reduced after a breaking point, and the stress control zone with almost zero cohesion intercept due to breakage of cementation bonds at a high confining stress level. It was shown that the sitting pressures during cementation have little effect on the strength parameters of cemented sand, while the increase of gypsum content and relative density, and the decrease of particle size, result in an increase of the cohesion intercept and the breaking point. In addition, the prediction equations for the shear strength and cohesion intercept in the cementation control zone and the transition zone are suggested from the analytical and experimental interpretation.
    Materialart: Article , PeerReviewed
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  • 8
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    The butterfly squid Stoloteuthis leucoptera in the Mediterranean (1991)
    Cambridge University Press
    In:  Journal of the Marine Biological Association of the United Kingdom, 71 (01). p. 47.
    Details
    Publikationsdatum: 2020-07-16
    Beschreibung: The presence of Stoloteuthis leucoptera in the Mediterranean is recorded on the basis of three specimens, including an adult male, caught by IKMT and by commercial otter-trawl in the Ligurian Sea. The hypothesis of a recent immigration is discussed. The list of Mediterranean cephalopods (Mangold Wirz, 1963; Torchio, 1968; Bello, 1986; Mangold & Boletzsky, 1987) includes the Sepiolidae of the subfamily Heteroteuthinae, whose members are supposed to be pelagic throughout their life cycle. Mangold Wirz (1963) recognizes in the Mediterranean fauna the unique species Heteroteuthis dispar, the other authors include H. atlantis Voss, which Voss himself (1955) reported at Messina. To this group may now be added Stoloteuthis leucoptera (Verrill, 1878) a species until now recorded in limited Atlantic areas. Verrill (1881) wrote “This species is an exceedingly beautiful one, when living, owing to the elegance and brilliancy of its colours and the gracefulness of its movements. In swimming it moves its fins in a manner analogous to the motion of the wings of a butterfly.”
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  • 9
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    Sexual reproduction in four Caribbean commercial sponges. I. Reproductive cycles and spermatogenesis (1991)
    Taylor & Francis
    In:  Invertebrate Reproduction & Development, 19 (1). pp. 1-11.
    Details
    Publikationsdatum: 2017-02-01
    Beschreibung: Sexual reproductive cycles of a Florida, U.S.A., population of four Caribbean commercial sponge species, Hippospongia lachne, Spongia barbara, S. cheiris and S. graminea, were determined by analysis of tissue samples collected over a three-year period. Spermatogenesis in these species was studied using light and transmission electron microscopy. The production of male gametes occurs in cysts within the endosomal tissue of mature specimens. Reproductive elements within an individual cyst develop synchronously while development between cysts is asynchronous. All available evidence suggests that these species are dioecious. Spermatogonia differentiate directly from choanocytes in situ. All cells of the chamber lose their collars and flagella and undergo mitosis to produce primary spermatocytes, each possessing a single flagellum. The ratio of nucleus to cell diameter in these cells is almost double that of choanocytes. Circumstantial evidence suggests that primary spermatocytes undergo meiosis to produce four spermatids, but confirmational chromatid linkage figures are still lacking. The mature spermatozoa lack both intermediate segments and acrosomes. Male gametes displayed a bright yellow-white autofluorescence when excited with blue light (460–485 nm).
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  • 10
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    Food of squidLoligo vulgaris reynaudii(Cephalopoda: Loliginidae) on their spawning grounds off the Eastern Cape, South Africa (1991)
    Taylor & Francis
    In:  South African Journal of Marine Science, 10 (1). pp. 193-201.
    Details
    Publikationsdatum: 2020-05-26
    Beschreibung: Squid on their spawning grounds feed mainly at night when they are more dispersed. In all, 28,5 per cent of squid sampled at night had food in their stomachs, whereas only 6,7 per cent of those collected by day had food. Most stomachs contained only a single prey species (90,8% of those analysed). Teleosts dominated the prey of squid collected at night (58%M), followed by crustaceans (25%), polychaetes (9%) and cephalopods (3%). By day the prey was dominated by cephalopods (61%), followed by teleosts (20%), crustaceans (14%) and polychaetes (2%). Bregmaceros sp. was the most frequently identified teleost, Loligo vulgaris reynaudii (cannibalism) the dominant cephalopod, ?Betaeus sp. (Alpheidae; pieces of coral were also found) the commonest crustacean and Nereis sp. the commonest polychaete. There were seasonal differences in the diet too: squid caught during summer seemed to have similar proportions of the four main prey components. Also, the incidence of feeding was higher than in winter. There were, however, no significant differences in stomach mass expressed as a percentage of body mass between day and night nor between season nor between sexes. The average stomach mass of all samples was 0,6 per cent of body mass, less than on the feeding grounds, where it is generally about 2 per cent.
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