Do biofilm communities respond to the chemical signatures of fracking? A test involving streams in North-central Arkansas

Table 4 Four dominant microbial classes found at study sites (Site) and analyzed by Group

Site	Sparto	Synecho	Oscillato	Nostoc	Group
A = Rock creek	0.0261	0.0162	0.0050	0.0105	1
B = Driver creek	0.0075	0.0063	0.0001	0.0026	1
C = Cedar creek	0.0158	0.0076	0.0086	0.0089	1
D = Sis hollow	0.0078	0.0163	0.0105	0.0073	1
A = East fork	0.0051	0.0269	0.0125	0.0001	2
B = Sunnyside creek	0.0031	0.0636	0.0766	0.0011	2
C = Hogans creek	0.0011	0.0549	0.0638	0.0017	2
D = Black fork	0.0029	0.0223	0.0443	0.0003	2
F-value	6.36	8.24	9.36	14.13
Probability	0.045	0.028	0.022	0.009^a

Sites are geographically depicted in Fig. 1; Allocation of sites to Group is provided in Table 1; Sparto = Bacterial class Spartobacteria, Synecho = Synechococcophycideae, Oscillato = Oscillatoriophycideae, and Nostoc = Nostocophycideae, with values representing arcsin-transformed percentages of abundance (Fig. 3); F-value is the F-statistic recorded in a 1-way analysis of variance (ANOVA) by Group (i.e., = MICZ versus PICZ) as derived in R [41]. Probability represents the statistical significance of each F-value at Bonferroni adjusted alpha = 0.017, with significance indicated by an^a

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