------------------------------------------------------ URA 2055 ---------------- Author(s) : DEVILLERS J., THIOULOUSE J.,KARCHER W. Chemometrical Evaluation of Multispecies-Multichemical Data by Means of Graphical Techniques Combined to Multivariate Analyses Ecotoxicology and Environmental Safety Serial Number : 26, 1993, pp. 333-345 ISSN : 0147-6513 Key-Words : MULTIVARIATE ANALYSIS,GRAPHICAL TECHNIQUES,PCA,PRINCIPAL COMPONENT ANALYSIS Abstract A new method combining graphical displays with principal component analysis (PCA) has been used to evaluate published data on the toxicity of seven chemicals to 14 species (17 testing procedures) of aquatic biota. The results reflect the usefulness of simple graphical approaches to analyzing the structure of environmental data sets. Thus, the study indicates the importance of end point selection and underlines some relationships among the species and chemicals. 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