Host phylogeny and host ecology structure the mammalian gut microbiota at different taxonomic scales

Table 2 The relative contributions of host phylogenetic relatedness and diet in predicting gut microbiota similarity

		Phylogenetic Relatedness			Dietary Similarity (% C4 grasses)
		R	Z stat	p.val	R	Z stat	p.val
Across all host study species (11 sp.) (N = 165)	Bray-Curtis	0.77	8.90	< 0.0001	0.15	1.09	0.27
	Jaccard	0.72	7.50	< 0.0001	0.03	0.27	0.78
	Unifrac (weighted)	0.76	8.51	< 0.0001	0.10	0.73	0.46
	Unifrac (unweighted)	0.71	7.47	< 0.0001	0.02	0.152	0.87
Across bovids (7 sp.) (N = 122)	Bray-Curtis	0.43	2.07	0.05	0.68	3.98	< 0.001
	Jaccard	0.35	1.63	0.12	0.69	4.05	< 0.001
	Unifrac (weighted)	0.31	1.41	0.17	0.57	2.94	< 0.001
	Unifrac (unweighted)	0.29	1.29	0.21	0.63	3.52	0.002

Shown are the rho, test statistic, and p-values associated with partial correlation coefficient tests that evaluated the correlation between 2 variables (e.g. gut microbiome similarity and phylogenetic relatedness, while controlling for a third (e.g. dietary similarity). The tests were conducted on 4 types of gut microbiome distance metrics, and significant p-values are bolded

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