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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Entomologia experimentalis et applicata 80 (1996), S. 55-64 
    ISSN: 1570-7458
    Keywords: taste ; gustation ; chemoreception ; feeding behaviour ; nutrition ; insect ; locust ; caterpillar
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The design features of gustatory systems are considered in relation to the need for insect herbivores (or indeed any animal) to regulate their nutrient intake. The gustatory system (defined to include both peripheral and central components) should ideally be designed to reflect: (a) the average nutritional requirements of the insect during its various developmental stages; (b) the ‘predictably unpredictable’ variation in nutrient supply-demand which occurs about that average; and (c) the distribution and composition of foods available in the environment. A mathematical model is presented which makes detailed predictions regarding behavioural and electrophysiological responses to foods or simple solutions varying in nutrient content.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Entomologia experimentalis et applicata 62 (1992), S. 221-231 
    ISSN: 1570-7458
    Keywords: Nutritional indices ; ratios ; analysis of covariance ; statistics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Some statistical problems are added to the growing list of cautionary tales regarding the use of the conventional, ratio-based nutritional indices (RCR, RGR, ECI, AD and ECD). Analysis of ratios is based on the, probably unrealistic, assumption of an isometric relationship between denominator and numerator variables. Analysis of covariance (ANCOVA) makes less restrictive assumptions, and additionally provides important information about the data which is lost by using ratio variables. We demonstrate, using computer-generated data sets, some of the pitfalls of statistical analysis of ratios and illustrate how these may be avoided using ANCOVA. Some possible consequences of such statistical iniquities for biological interpretations are discussed.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Entomologia experimentalis et applicata 56 (1990), S. 47-60 
    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
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  • 4
    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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