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  • Key words. nutritional models - nutrient budgets - feeding patterns - nutritional efficiency - digestive models - Locusta migratoria  (1)
  • Nutritional indices  (1)
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  • 1
    Electronic Resource
    Electronic Resource
    Analysis of covariance: an alternative to nutritional indices (1992)
    Springer
    Entomologia experimentalis et applicata 62 (1992), S. 221-231 
    Details
    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
    URL: http://dx.doi.org/10.1007/BF00353441
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Nutrient transfer functions: the site of integration between feeding behaviour and nutritional physiology (1998)
    Springer
    Chemoecology 8 (1998), S. 61-68 
    Details
    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
    URL: http://dx.doi.org/10.1007/PL00001805
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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