3.4 | Core genera in mammals
We selected the genera that were shared by all samples of each gene catalogue among the 12 species and termed these core genera. We identified 624 such core genera in the SNMs gut microbiome and 95 in the human gut microbiome (Table S10). Comparing the core genera from these species, we found 74 core genera shared among all 12 species, but we also noted that these genera had different relative abundance between each host (Figure S3). Among these 74 core genera, we further selected the top 30 most abundant genera in each species and displayed them in box plots (Figure S4). Then we found 9 genera shared in all 12 species, including Clostridium , Ruminococcus , Prevotella ,Bacteroides , Eubacterium , Parabacteroides ,Roseburia , Alistipes , and Oscillibacter , which may constitute a core mammalian gut microbiome (Figure S4). These genera belong to the Firmicutes (Clostridium , Ruminococcus ,Eubacterium Roseburia and Oscillibacter ) and Bacteroides (Prevotella , Bacteroides ,Parabacteroides and Alistipes ).