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De l'optimisation du nombre de variables morphologiques dans la discrimination entre populations (le cas de l'aile chez Drosophila melanogaster)
Authors:C. Terzian
Affiliation:(1) Laboratoire de Biologie des Populations, Université Claude Bernard Lyon I, 43 Bd du 11 Novembre 1918, 69622 Villeurbanne, France
Abstract:Whilst wing size measurements are often used in Drosophila to discriminate between groups of individuals, the choice of the particular characters measured is generally not justified.Statistical and genetical properties of 8 characters measured on the left wing, in three stocks of Drosophila melanogaster were analysed. A multivariate analysis is done by studying correlations between characters and by interpreting the first factor of a principal component analysis.The results shows that only one measurement is sufficient in order to discriminate between the stocks, as far as mean values are concerned; wing length is, in that case, the best character since its variance has a relatively high genetic component. When dealing with correlation among characters as a way of estimating shape, four measurements are needed and sufficient. This shows the necessity of choosing the characters to be measured.
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