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  • Key words. nutritional models - nutrient budgets - feeding patterns - nutritional efficiency - digestive models - Locusta migratoria  (1)
  • Nutritional homeostasis  (1)
  • amino acids  (1)
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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Entomologia experimentalis et applicata 56 (1990), S. 259-268 
    ISSN: 1570-7458
    Keywords: Locusta migratoria ; chemoreceptors ; sucrose ; amino acids ; age effects
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Résumé Pendant la croissance de L. migratoria L. les réactions aux acides aminés et aux sucres des sensilles chimiques des palpes maxillaires changent. Ces changements relatifs de la sensibilité chimique à ces deux aliments correspondent aux modifications dans l'ingestion de protéines et d'hydrates de carbone par cet insecte. La diminution de la réponse aux acides aminés est liée à la fois au nombre de sensilles qui réagissent et à leur taux de réaction. La sensibilité des sensilles au sucrose varie moins profondément et implique uniquement des modifications du nombre de sensilles réagissant. Nous suggérons que des variations de la teneur en éléments nutritifs de l'haemolymphe, dues à des modifications de la demande en protéines et en glucides nécessaires à la croissance, influent sur la sensibilité gustative.
    Notes: Abstract During somatic growth in adult Locusta migratoria L. there are variations in the responsiveness of chemosensilla on the maxillary palps. Relative changes in chemosensitivity to amino acids and sucrose are consistent with relative changes in protein and carbohydrate ingestion. There is a decline throughout the somatic growth phase in the proportion of sensilla responding to stimulation. In those sensilla which respond, there is a decline in the firing rate to amino acids, while sucrose responsiveness declines to a lesser degree. We suggest that variations in the levels of nutrients in the storage tissues, especially the haemolymph, arising from changes in the demand for protein and carbohydrate for growth, directly or indirectly, influence gustatory sensitivity.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1423-0445
    Keywords: Key words. nutritional models - nutrient budgets - feeding patterns - nutritional efficiency - digestive models - Locusta migratoria
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary. We describe and extend a graphical approach to quantitative nutrition that focuses on the interplay between behavioural and physiological components of nutritional regulation. The site of integration is the nutrient transfer function, which is the function describing the time course of nutrient transfer between serially connected nutritional compartments (e.g., from the gut to the blood). The relationship between the shape of the nutrient transfer function and the temporal patterns of feeding determines the values of two key quantitative parameters of nutrition: the rate ('power') and the efficiency of nutrient acquisition. The approach can be extended to consider, in addition to the short-term behavioural and physiological decisions made by animals, some ecological determinants and longer-term, life history consequences of such decisions. Most importantly, this category of models can provide insights into the interplay among the various nutrients in an animal's diet. We illustrate this using hypothetical examples, and also present preliminary data for the power-efficiency relationships of protein and digestible carbohydrates in locusts. Finally, we consider existing evidence for the various means available to these and other insects for regulating such relationships.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Journal of comparative physiology 166 (1996), S. 223-229 
    ISSN: 1432-136X
    Keywords: Nutritional homeostasis ; Haemolymph amino acid ; Haemolymph sugar ; Unbalanced diets ; Locust ; Locusta migratoria
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract Aspects of pre- and post-ingestive compensation were investigated in locusts (Locusta migratoria) fed nutritionally unbalanced artificial diets containing 7% protein and 21% digestible carbohydrate (7:21) or 21% protein and 7% digestible carbohydrate (21:7). Feeding behaviour and haemolymph levels of amino acids and sugars were measured in locusts fed ad libitum on these diets. Locusts fed the high-protein diet had chronically elevated haemolymph levels of 15 out of 19 amino acids measured compared to locusts fed the low protein diet. However, haemolymph levels of lysine, alanine, aspartic acid and glutamic acid did not differ between diets, suggesting some specific regulatory mechanism for these amino acids. Haemolymph glucose and trehalose reflected levels of carbohydrate in the diets, being high in insects fed diet 7:21 relative to those given diet 21:7. These data are discussed in relation to the physiological and behavioural bases of nutritional homeostasis.
    Type of Medium: Electronic Resource
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