Table 2.

Statistical comparison on the relative impact of rig, pipe orientation, and water use frequency. Weighted UniFrac distance matrix was applied for Adonis and Betadisp test with permutation = 999 ({vegan}, R)

	Rig			Pipe orientation			Water use frequency
	R 2 Adonis	P Adonis	P Betadisp	R 2 Adonis	P Adonis	P Betadisp	R 2 Adonis	P Adonis	P Betadisp
a. Biofilm samples
2-month pre- (36)	0.2917	0.001	0.261	0.1160	0.004	0.487	0.1508	0.006	0.290
Immediately pre- (35)	0.2082	0.001	0.014	0.1782	0.001	0.001	0.1897	0.003	0.873
2-month post- (36)	0.1614	0.001	0.001	0.1925	0.001	0.024	0.1121	0.031	0.383
b. Bulk water samples
2-month pre- (36)	0.4311	0.001	0.012	0.1580	0.010	0.308	0.1018	0.104	0.466
Immediately pre- (34)	0.2937	0.001	0.001	0.0944	0.016	0.225	0.1125	0.056	0.282
Immediately post- (36)	0.7772	0.001	0.833	0.0116	0.645	0.714	0.0388	0.550	0.935
8-h post- (36)	0.6692	0.001	0.833	0.0253	0.364	0.965	0.0337	0.655	0.770
2-month post- (36)	0.1076	0.013	0.896	0.0343	0.298	0.909	0.5350	0.001	0.051

Bold font indicates statistically significant value (P < 0.05)