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  • 1
    Digitale Medien
    Digitale Medien
    Springer
    Entomologia experimentalis et applicata 77 (1995), S. 99-104 
    ISSN: 1570-7458
    Schlagwort(e): nutrient budgets ; nutrient allocation ; life history
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: 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.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    Springer
    Entomologia experimentalis et applicata 80 (1996), S. 65-68 
    ISSN: 1570-7458
    Schlagwort(e): nutritional models ; nutrient budgets ; feeding patterns ; nutritional efficiency
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: 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.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 3
    Digitale Medien
    Digitale Medien
    Springer
    Entomologia experimentalis et applicata 36 (1984), S. 279-286 
    ISSN: 1570-7458
    Schlagwort(e): Schistocerca gregaria ; feeding ; meal size ; volumetric feedback ; stretch receptors
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Beschreibung / Inhaltsverzeichnis: 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.
    Notizen: 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.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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