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  • 1980-1984  (3)
  • 1970-1974  (4)
  • 1
    Electronic Resource
    Electronic Resource
    The intermediate moult (First Ecdysis) of Schistocerca gregaria (Forskål) (Insecta, Orthoptera) (1972)
    Springer
    Zoomorphology 71 (1972), S. 160-179 
    Details
    ISSN: 1432-234X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Ecdysis of the embryonic cuticle has been studied in detail. The initiation and mechanical processes involved in this ecdysis, and the associated differential size increases of cuticular parts have been given most attention. The roles of air swallowing and of thoracic contraction are most imoprtant for rupturing the old cuticle, while abdominal contractions assist the whole process. Some specialized cuticular structures are described.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00298575
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    The vermiform larva of Schistocerca gregaria (Forskål): Form and activity (Insecta, Orthoptera) (1971)
    Springer
    Zoomorphology 70 (1971), S. 183-200 
    Details
    ISSN: 1432-234X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract A detailed study of the vermiform larva of Schistocerca gregaria was made using film analysis in combination with morphological studies. The adaptations of the body are illustrated, and the use of these in digging up to the surface of the ground is described. The means of orientation were investigated, and unusual club-tipped hairs are suggested as important mechanoreceptors.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00277761
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    The regulation of feeding in Locusta migratoria: Internal inhibitory mechanisms (1973)
    Springer
    Entomologia experimentalis et applicata 16 (1973), S. 329-342 
    Details
    ISSN: 1570-7458
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Zusammenfassung Alle Hauptnerven des Mund- und Rachennervensystems wurden kontrolliert reseziert. Erst wenn die rückwärtigen Rachennerven zerschnitten werden, nehmen die Insekten wesentlich mehr Nahrung zu sich. Solche Insekten versuchen längere Zeit zu fressen. Wenn sich während des Fressens der Vorderdarm füllt, wird keine Nahrung an den Mitteldarm weitergegeben und sein Vorderende ist der letzte Teil, der sich vollständig ausdehnt. Nach Durchtrennung der rückwärtigen Rachennerven sind alle Teile des Vorderdarms offen-sichtlich mehr gedehnt. Eine solche erhöhte Nahrungsaufnahme tritt aber nicht ein, wenn die Nahrung relativ ungünstig ist. Das Abbinden des Kropfes verursacht beim nachträglichen Fressen keine übermäßige Ausdehnung des Vorderteiles. Die Nahrungsaufnahme hat keinen Unterschied im Körpervolumen zur Folge und das Durchtrennen des ventralen Nervenstranges bleibt ohne Einfluß auf die nachträglich aufgenommenen Nahrungsmengen. Das vergrößerte Darmvolumen wird durch Kollaps des Luftsackes kompensiert.
    Notes: Abstract During the course of a meal by insects with an empty gut, food is held in the foregut and the midgut remains empty. The last part of the foregut to fill is the extreme anterior end of the crop, and stretch receptors in this region control the amount eaten. Cutting the posterior pharyngeal nerves isolates these receptors from the frontal garglion and results in hyperphagia pharyngeal nerves isolates these receptors from the frontal garglion and results in hyperphagia during one meal. On unfavourable food, when smaller amounts are eaten, distension of the foregut is not involved in regulating meal size. Feedback from receptors in the body wall is not important in regulating meal size; most of the increase in gut volume resulting from feeding is taken up by the collapse of the air sacs so that there is little or no change in the body volume.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00334244
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  • 4
    Electronic Resource
    Electronic Resource
    The differential effects of ingested tannic acid on different species of Acridoidea (1980)
    Springer
    Entomologia experimentalis et applicata 28 (1980), S. 158-166 
    Details
    ISSN: 1570-7458
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Zusammenfassung Wachstum und Entwicklung von 15 Acridoidea-Arten wurde studiert und zwar mit und ohne Zugabe von Tanninsäure zur Nahrung in Konzentrationen bis zu 20% Trockensubstanz. In keinem Fall wurde die Verdauung beeinträchtigt; nur in den hohen Konzentrationen wurde die Futteraufnahme gesichert vermindert. Polyphage Arten zeigten keine ungünstige Effekte, und bei zwei Arten wirkte Tannin günstig. Dagegen wurde bei grasfressenden Heuschrecken das Wachstum reduziert, und die Überlebensrate war gering. Der Unterschied liegt im wesentlichen darin, dass bei grassfressenden Arten Tanninsäure in die peritrophische Membran eindringt und das Mitteldarmephithel beschädigt, wobei es zu Läsionen kommt und wobei Tannin in die Körperhöhle gelangt.
    Notes: Abstract The growth and development of fifteen species of Acridoidea were studied, with and without the addition of tannic acid in concentrations of up to 20% dry weight. In no case was digestion disturbed, and only at the high levels was there a significant reduction in consumption. Polyphagous species showed no deleterious effects, and in two species tannin was beneficial, while graminivorous acridids showed reduced growth rates and poor survival. The difference lies mainly in the fact that tannic acid penetrates the peritrophic membrane in the graminivorous species, and causes damage to the midgut epithelium with the eventual development of lesions and the occurrence of tannin in the haemocoel.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00287124
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  • 5
    Electronic Resource
    Electronic Resource
    Meal size in nymphs of Locusta migratoria (1972)
    Springer
    Entomologia experimentalis et applicata 15 (1972), S. 399-410 
    Details
    ISSN: 1570-7458
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Zusammenfassung Die Nahrungsmenge, die von einer Larve der Wanderheuschrecke, Locusta migratoria L., im fünften Entwicklungsstadium bei einer einzigen Mahlzeit verzehrt wird, wurde ermittelt, indem ihr Darm und Darminhalt sofort nach dem Fressen gewogen wurden. In der Mitte des Entwicklungsstadiums wurden größere Mengen verzehrt, Weibchen fraßen mehr als Männchen, jedoch sind die weiblichen Larven ja auch größer. Die Menge der aufgenommenen Nahrung vergrößerte sich mit der Dauer künstlichen Futterentzuges. Sie erreichte ihren Höhepunkt nach sechs Stunden, nach welcher Zeit der Vorderdarm absolut leer war. Die verzehrten Mengen waren je nach der Art der Nahrung unterschiedlich. Auch stellten die Insekten sich so ein, daß sie von einer bestimmten Nahrung mehr zu sich nahmen, wenn sie daran aufgezogen worden waren. Nach längeren Zeitspannen der Isolierung hatten sie die Tendenz, weniger zu fressen. Temperatur und Feuchtigkeit hatten keinen Einfluß auf die Mengen, die verzehrt wurden, außer bei 40°, bei welcher Temperatur sich das gesamte Verhalten zum Fressen ändert.
    Notes: Abstract Meal size in fifth-instar nymphs of Locusta migratoria L. has been investigated by weighing the gut and its contents immediately after feeding. Larger meals are taken in mid-instar, while females eat more in one meal than males under the same conditions. Bigger meals are also eaten after longer periods of food deprivation, but after deprivation for two hours or less, corresponding with the normal interfeed length, meals are smaller than would be expected from the potential maximum foregut volume. The maximum volume attained varies with the type of food available to the insects and is influenced by previous conditioning. Temperature and humidity do not affect meal size except at 40°, at which temperature the usual pattern of feeding is completely altered.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00293604
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Tolerance of acridids to ingested condensed tannin (1981)
    Springer
    Journal of chemical ecology 7 (1981), S. 247-256 
    Details
    ISSN: 1573-1561
    Keywords: Condensed tannin ; quebracho ; Orthoptera ; Acrididae ; digestibility ; Schistocerca ; Locusta ; Zonocerus ; Chortoicetes ; peritrophic membrane
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract Four species of Acridoidea were fed on wheat leaves with and without the condensed tannin, quebracho. In no case was it deleterious to survival and growth at levels below about 10% dry weight on the food. Similarly, consumption, digestibility, and utilization of food were unaffected at up to 10% dry weight. At higher concentrations, however, the consumption and the efficiency of conversion of digestion were reduced, although digestibility was little affected. The possible mechanisms for such tolerance are discussed, and contrast made with insects which are very sensitive to ingested condensed tannin.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00995747
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    Attraction and repulsion of the aphid,Cavariella aegopodii, by Plant Odors (1981)
    Springer
    Journal of chemical ecology 7 (1981), S. 881-888 
    Details
    ISSN: 1573-1561
    Keywords: Aphid ; Cavariella aegopodii ; Homoptera ; Aphididae ; plant odor ; carvone ; attractant ; repellent ; host-finding
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract Cavariella aegopodii is induced to land on traps by the monoterpene carvone, and the relevance of this to host-finding by the aphid is discussed. Catches are reduced by linalool. The interaction of plant chemicals in natural communities is discussed, and the possibility of using repellent chemicals for crop protection is suggested.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00992385
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    Paper (German National Licenses)
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