Fig. 6.

Phylogenetic tree showing the relative distribution of the most abundant taxa found in the tribal adult and rural adult groups. The taxa are coloured pink (tribal adult group only), blue (rural adult group only) or brown (common to both tribal adult and rural adult groups). It is noted that taxa from tribal adults and rural adults do not distribute equally but seem to be clustered in groups adjacent to each other, suggesting that each cluster may have derived from a common root but evolved over generations in slightly different ways.