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  • 1
    Electronic Resource
    Electronic Resource
    Dietary selection in adultLocusta migratoria (1990)
    Springer
    Entomologia experimentalis et applicata 56 (1990), S. 47-60 
    Details
    ISSN: 1570-7458
    Keywords: Locusta migratoria ; locust ; self-selection ; feeding behaviour ; nutritional compensation ; adult development
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Résumé La sélection des aliments a été suivie pendant les 15 premiers jours de vie imaginale des mâles et des femelles deLocusta migratoria L. Les insectes recevaient 2 régimes alimentaires, l'un contentant 10, 20 ou 28% de protéines, mais pas de carbohydrates assimilables, l'autre 10, 20 ou 28% de carbohydrates assimilables, mais pas de protéines. Les quantités consommées, le détail de la prise de nourriture, et les croissances somatique et reproductive ont été mesurés. Malheureusement, ces régimes artificiels n'ont pas permis le développement ovarien des femelles. Cependant, il y a des preuves convaincantes que les insectes ont contrôlé leur apport en protéines et en carbohydrates pendant la phase de croissance somatique par une sélection alimentaire et une modification de la consommation.
    Notes: Abstract Dietary selection was investigated during the first 15 days of adult life in male and femaleLocusta migratoria L. Insects were provided with two artificial diets, one containing 10, 20 or 28% protein but no digestible carbohydrate, the other 10, 20 or 28% digestible carbohydrate but no protein. Amounts eaten, detailed feeding patterns and somatic and reproductive growth were measured. Unfortunately the artificial diets did not support female reproductive development. Nevertheless, there was convincing evidence that insects regulated both protein and carbohydrate intake during the somatic growth phase by dietary selection and altered consumption.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00579614
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  • 2
    Electronic Resource
    Electronic Resource
    Meeting nutrient requirements: the roles of power and efficiency (1996)
    Springer
    Entomologia experimentalis et applicata 80 (1996), S. 65-68 
    Details
    ISSN: 1570-7458
    Keywords: nutritional models ; nutrient budgets ; feeding patterns ; nutritional efficiency
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Conclusions We have attempted to illustrate the importance of nutrient transfer functions and their key quantitative parameters, power and efficiency. While this brief account has focused on one aspect of nutritional behaviour, the duration of intermeal intervals, the models are equally useful for understanding other components of feeding behaviour such as meal size and food switching. Like-wise, they provide a framework for formulating quantitative predictions about the dynamics of the physiological processes involved in digestion, absorption and the utilisation of food. These aspects are dealt with more fully elsewhere.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00194725
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Constructing nutrient budgets (1995)
    Springer
    Entomologia experimentalis et applicata 77 (1995), S. 99-104 
    Details
    ISSN: 1570-7458
    Keywords: nutrient budgets ; nutrient allocation ; life history
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract We present a formalised, yet flexible, scheme for classifying and symbolising the components of nutrient budgets. The scheme distinguishes hierarchically both among components of the ingesta and among the various sinks to which they are allocated. The primary terms in the budget are distinguished according to either methodological criteria (whether in a given time period they are retained by the animal or dissociated from the body) or functional criteria (whether they contribute to fitness). In both methodological and functional classifications, the primary terms of the budget may be progressively expanded to represent with increasing resolution nutrient allocation. The interplay between the various components of the ingesta and their subsequent allocation may be considered simultaneously using a two-dimensional nutritional matrix.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02383023
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Volumetric feedback and the control of meal size in Schistocerca gregaria (1984)
    Springer
    Entomologia experimentalis et applicata 36 (1984), S. 279-286 
    Details
    ISSN: 1570-7458
    Keywords: Schistocerca gregaria ; feeding ; meal size ; volumetric feedback ; stretch receptors
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Résumé L'étude de la nature et du rôle des feed backs volumétriques dans la régulation de la taille du repas a été effectuée chez S. gregaria. Un feed back, originaire de la région antérieure du jabot, s'est révélé important et la dénervation a provoqué l'hyperphagie. Des feed backs supplémentaires ont été décelés dans des régions plus postérieures du jabot. De l'agar ou de la paraffine canulés dans la jabot moyen et postérieur ont provoqué une diminution de la taille du repas suivant. Ces effets sont supprimés avec la section de la corde nerveuse centrale avant le ganglion abdominal terminal. L'augmentation du volume sanguin par des injections de solution saline isotonique a aussi diminué la taille du repas suivant. Cet effet n'est pas transmis via des récepteurs de tension du jabot ou de la paroi du corps; des mécanismes envisageables sont discutés. Ces résultats avec S. gregaria sont comparés à ceux obtenus antérieurement avec Locusta migratoria.
    Notes: Abstract The role and nature of volumetric feedbacks in the regulation of meal size was investigated for Schistocerca gregaria. Feedback from the anterior region of the crop was found to be important and denervation led to hyperphagia. Additional feedbacks were found from more posterior gut regions. Cannulating agar or paraffin into the mid- and hindgut caused a decrease in the size of a following meal. This effect was removed by cutting the ventral nerve cord anterior to the terminal abdominal ganglion. Increasing the blood volume by injections of isotonic saline into the haemocoel was also found to decrease subsequent meal size. This effect was not mediated via the gut or body wall stretch receptors and possible mechanisms are discussed. The results for S. gregaria are compared with those obtained previously from Locusta migratoria.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00185659
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    Paper (German National Licenses)
    Fulltext
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