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  • 1
    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)
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  • 2
    Electronic Resource
    Electronic Resource
    Haemolymph amino acid and sugar levels in locusts fed nutritionally unbalanced diets (1996)
    Springer
    Journal of comparative physiology 166 (1996), S. 223-229 
    Details
    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
    URL: http://dx.doi.org/10.1007/BF00263986
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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