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

Table 3 Water chemistry for each Site (sampling location) and Group (sites group in Table 1)

Site	Tot-N	Tot-Ph	Conductivity	Group
A = Rock creek	0.21	0.014	0.014	1
B = Driver creek	0.07	0.012	0.012	1
C = Cedar creek	0.07	0.01	0.01	1
D = Sis hollow	0.07	0.01	0.01	1
A = East fork	0.3	0.032	0.032	2
B = Sunnyside creek	0.72	0.032	0.032	2
C = Hogans creek	0.86	0.016	0.016	2
D = Black fork	0.41	0.038	0.038	2
F-value	11.93	13.99	6.49
Probability	0.014^a	0.010^a	0.043

Sites are geographically depicted in Fig. 1; Allocation of sites to Group is provided in Table 1; Total nitrogen (Tot-N), total Phosphorus (Tot-Ph), and Conductivity values were originally recorded as μg/L (Tot-N and Tot-Ph) and millisieverts/cm (Conductivity) but have been log10-transformed; F-value is the F-statistic recorded in a 1-way analysis of variance (ANOVA) by Group [i.e., = MICZ (1) versus PICZ (2)] as derived in R [41]. Probability represents the statistical significance of each F-value as determined by Bonferroni adjusted alpha = 0.017, with significance indicated by an^a

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