Abstract
Malacological associations of the middle-upper Pleistocene sequence of Achenheim (Bas-Rhin, France), already described by J.-J. Puisségur (1978) are analysed and compared by factor analysis of correspondences Results are interpreted through ecological significance of species, whose the greatest number still exist nowadays. Climatic and environmental trends appear to be linked with several factors. The main factor distinguishes associations along a thermic gradient defined by species of cold and temperate climate. On the other hand, several trends show dry versus damp conditions and forest versus steppic vegetal covering. Following stratigraphical order, the serie of associations shows the climatic evolution recorded through the sequence and precise climatic curves obtained by J.-J. Puisségur by using distributions of ecological groups of species.
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