Classification of strains based on morphological profiles. A) Hierarchical clustering of strains. Numbers along the dendrogram indicate p-values computed by the multi-scale bootstrap technique  (see Methods). Colored squares over the strain names indicate their ecological origin, as in Figure 1A. The heatmap shows the variation of 501 traits from low (green) to high (red) values, with rows and columns representing traits and strains, respectively. Three significant classes of strains (I, II and III) are framed in color. B) Representative cells of each phenotypic class. The morphological features are described based on the parameters discriminating the classes (see Methods). Bar: 5 μm.