FIGURE 2.

Core genera and core OTUs. Core taxa were identified for tribal and urban groups that were observed in ≥70% of the samples with a minimum abundance of 0.1% relative abundance. (A) Core genera in tribal and urban groups with a bootstrap score of >80. Although some genera, viz., Prevotella and Faecalibacterium, were observed as core in both communities, there is a huge difference in their median abundance between the groups. (B) Core OTUs in tribal and urban groups with a bootstrap score >80. Differences in the median abundance of core OTUs in tribal vs. urban communities were observed, similar to the core genera profile. A large number of OTUs that were observed to be core in the tribal community were almost absent in the urban cohort. Different OTUs for Prevotella copri were abundant and were found to be core in the tribal (OTU_33) vs. the urban cohort (OTU_2). NA indicates that Genus or OTU did not cross the requisite boot-strap score to qualify as a ‘core’ Genus or ‘core’ OTU, respectively.