Fig. 2

Species bacterial diversity and species phylotypic tree based on Bray-Curtis distance matrix. a Bacterial diversity (inverse Simpson biodiversity index), bacterial richness (Chao1 richness index) and bacterial evenness (Deduced from Simpson index). Bacterial diversity indexes are expressed as a box plot of the mean from subsampled datasets, whiskers represent minimum and maximum value. Median is shown as a line inside the box. b Phylotype tree of the 118 subsampled datasets built upon a Bray-Curtis distance matrix at the species taxonomical level (average tree is shown, 1000 iterations). The figure also shows all the faecal samples studied by 16S rDNA profiling analysis collected from each resident in different weeks