Fig. 1: Strain-sharing across multiple relationship types.
From: Gut microbiome strain-sharing within isolated village social networks
a, Distribution of strain-sharing rates based on relationship type. All pairwise relationship comparisons are significantly different, except for those marked NS (Kruskal–Wallis test, χ2 = 65,983; n = 1,542,204, P < 2.2 × 10−16; two-sided Wilcoxon rank-sum tests for pairwise comparisons). The final two boxes quantify the strain-sharing rates between all pairs of people living in the same village without a nominated relationship (nom) and all pairs of people living in different villages, respectively. Data are represented as boxplots, where the middle line is the median and the lower and upper hinges correspond to the first and third quartiles. The whiskers extend from the hinge to the largest or smallest value no further than 1.5× IQR from the hinge. The median values for each distribution are also reported at the top of each box. b, The propensity to share strains increases as a function of how often a pair spends free time together. Only non-significant pairwise comparisons are indicated (Kruskal–Wallis test, χ2 = 105.46, n = 1,703, P < 2.2 × 10−16; two-sided Wilcoxon rank-sum tests for pairwise comparisons). c, The propensity to share strains increases as a function of how often a pair shares meals together. Only non-significant pairwise comparisons are shown (Kruskal–Wallis test, χ2 = 194.25, n = 1,737, P < 2.2 × 10−16; two-sided Wilcoxon rank-sum tests for pairwise comparisons). d, Strain-sharing rate varies by the typical way people greet each other (Kruskal–Wallis test, χ2 = 40.03, n = 1,734, P = 4.47 × 10−7). e, We performed 1,000 permutations per covariate and used linear models to estimate the mean squared error in the permutations (MSEperm) and then compared the difference between the mean squared errors in the permutation models and the original model (MSEorig); as shown, the most important feature identified is the presence of a relationship (when looking at only the non-kin relationships). Data are presented as mean ± s.d. NS, not significant (Padj ≥ 0.05).
