Table 1.

Permutational multivariate analysis of variance (PERMANOVA) results showing the influence of company, age, performance and their interactions on the bacterial community structure in excreta and dust samples

Sample type	Source	df	Sum of squares	Pseudo-F	R2	P value	PERMDISP P value
Excreta	Company	1	167,120	91.10	0.21	0.001	< 0.001
	Age	4	81,418	11.10	0.10	0.001	0.008
	Performance	1	10,863	5.92	0.01	0.001	0.03
	Age × company	4	39,511	5.38	0.05	0.001
	Company × performance	1	12,723	6.94	0.02	0.001
	Age × performance	4	14,605	1.99	0.02	0.001
	Performance × age × company	4	19,093	2.60	0.02	0.001
	Residuals	238
Dust	Company	1	29,643	21.94	0.11	0.001	0.003
	Age	4	35,962	6.65	0.13	0.001	< 0.001
	Performance	1	9151.6	6.77	0.03	0.001	0.11
	Age × company	4	15,488	2.87	0.06	0.001
	Company × performance	1	4559.6	3.37	0.02	0.001
	Age × performance	4	8810.5	1.63	0.03	0.001
	Performance × age × company	4	11,313	2.09	0.04	0.001
	Residuals	111

Df, degrees of freedom; R², proportion of the variance explained by each model; PERMDISP, permutational analyses of multivariate dispersion