------------------------------------------------------ URA 2055 ---------------- Author(s) : THIOULOUSE J.,CHESSEL D. A method for reciprocal scaling of species tolerance and sample diversity Ecology Serial Number : 73, 1992, pp. 670-680 ISSN : 0012-9658 Key-Words : ORDINATION,DIVERSITY,NICHE WIDTH,CORRESPONDENCE ANALYSIS,BIPLOTS, DUAL SCALING,STATISTIC GRAPHICS,ELLIPSES,GAUSSIAN CURVES,GRAPHMU, MACMUL,MACINTOSH Abstract The method and the associated graphical representations proposed in this paper facilitate the interpretation of the correspondence analysis (CA) of a samples / species data table. By using the "reciprocal discrimination" model of CA, this method introduces directly and on the same graph the notions of niche width and within-sample diversity. We propose two Macintosh programs for computing conditional means, variances, and covariances of factor scores for species and samples, and for drawing ellipses and Gaussian curves from these values. Two examples of ecological interest show how resulting graphics help understanding the results of multivariate analyses. E-Mail : thioulou@biomserv.univ-lyon1.fr Laboratoire de Biometrie, Genetique et Biologie des Populations (URA 2055) - Univ. C. Bernard LYON I - 69622 VILLEURBANNE CEDEX