A non-linear model for examining genotypic responses across an array of environments is contrasted with the 'joint regression' formulation, and a rigorous approach to hypothesis testing using the conditional error principle is demonstrated. The model is extended to cater for situations where single straight-line response patterns fail to characterize genotypic behaviors over an environmental array: a combination of two straight lines, with slope in below-average and in above-average environments, is offered as the 1 2 simplest representation of convex and concave patterns. A protocol for classifying genotypes according to the results of hypothesis tests, i.e. H( = ) and H( = = = 1), is 1 2 1 2 presented . A doubly desirable response pattern is convex ( < 1< ), while a doubly 1 2 undesirable pattern is concave ( > 1> ). 1 2
Puparial durations and rates of development at constant temperatures have been estimated for puparia derived from colony and field populations. Rates of development may now be predicted over the temperature range 8° to 32° C, estimates for temperature less than 16° having been obtained by a technique using alternating temperature regimes. No evidence was found for localised racial variation, but some evidence is presented for a larval conditioning effect.
ZUSAMMENFASSUNG
DAUER DES PUPARIUM‐STADIUMS BEI GLOSSINA MORSITANS ORIENTALIS UNTER KONSTANTEN TEMPERATUR‐BEDINGUNGEN
Dauer des Puparium‐Stadiums und der Entwicklungsraten bei konstanten Temperaturen wurden für Puparien ermittelt, die aus Zucht‐ und Freilandpopulationen stammten. Die Entwicklungsraten können nun über einen Temperaturbereich von 8 bis 32° vorausgesagt werden, wobei die Werte für Temperaturen unter 16° durch eine Methode mit Wechseltemperaturen gewonnen wurden. Es konnten keine Anhaltspunkte für lokale Rassenunterschiede festgestellt werden, doch ergab sich die Wahrscheinlichkeit für einen Einfluß der Temperaturen, die zuvor auf die Larven eingewirkt haben.
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