TABLE 1.

Dissimilarity tests of gut microbial communities based on three nonparametric tests^a

Sampling time and group comparison	MRPP		ANOSIM		PERMANOVA
	Delta	P	R	P	F	P
15 days
C vs L	0.253	0.001	0.850	0.004	14.153	0.004
C vs M	0.364	0.003	0.495	0.002	6.680	0.002
C vs H	0.340	0.008	0.588	0.003	11.365	0.004
45 days
C vs L	0.328	0.002	0.909	0.003	18.338	0.004
C vs M	0.283	0.004	0.646	0.001	4.412	0.003
C vs H	0.267	0.005	0.938	0.004	11.380	0.002
C vs L-R	0.305	0.003	0.892	0.002	9.5674	0.007
C vs M-R	0.362	0.004	0.888	0.002	13.091	0.003
C vs H-R	0.234	0.020	1.000	0.0.013	33.933	0.010
75 days
C vs L	0.352	0.002	1.000	0.003	17.957	0.003
C vs M	0.310	0.006	0.892	0.002	16.502	0.002
C vs H	0.423	0.001	1.000	0.004	11.714	0.003
C vs L-R	0.404	0.005	0.585	0.003	7.777	0.003
C vs M-R	0.361	0.002	0.827	0.003	11.587	0.001
C vs H-R	0.437	0.004	0.580	0.003	7.167	0.004

^aC, control; L, M, and H, exposure to treatments of low (10 μg/liter), medium (33 μg/liter), and high (100 μg/liter) concentrations of AgNPs, respectively; L-R, M-R, and H-R, recovery from exposure to low (10 μg/liter), medium (33 μg/liter), and high (100 μg/liter) concentrations of AgNPs, respectively; MRPP, multiple-response permutation procedure; ANOSIM, analysis of similarities; PERMANOVA, permutational multivariate analysis of variance; Delta, a measure of dissimilarity by means of a “delta score”; R, the correlation coefficient, where an R value near +1 means that there is dissimilarity between the groups, while an R value near 0 indicates no significant dissimilarity between the groups; F, pseudo-f statistic for testing the null hypothesis.