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Table 2 Significance of the bacterial community differences between sample types and sampling seasons

From: Bacterial diversity and predicted enzymatic function in a multipurpose surface water system – from wastewater effluent discharges to drinking water production

Samples included Experimental grouping Rb p-value
All samples Sample groupsa 0.92 <  0.001
Seasons 0.04 <  0.003
Sewage Effluent and Influents 0.34 <  0.001
Sewage effluent Seasons 0.20 <  0.001
Industrial effluents Industry I and Industry II 0.67 <  0.001
Seasons −0.09 <  0.737a
Surface Water Lake region, tributaries, and main river 0.10 <  0.002
Seasons 0.38 <  0.001
Sampling depth 1 m, 10 m, and 40 m in Site 2 of surface water (Pyhäjärvi) 0.07 <  0.196a
Treated samples Pretreated water and AGR process water (combining groundwater observation well and production well samples) 0.96 <  0.001
Seasons −0.06 <  0.970a
  1. a Ordination method: PCoA, distance method: Bray-Curtis index, taxonomic level: OTU, statistical method: analysis of group similarities (ANOSIM). Sample groups are presented in Table 1 and Fig. 2. bEvaluation criteria: (a) 0.75 < R < 1, highly separate; (b) 0.5 < R < 0.75, separate; (c) 0.25 < R < 0.5, separate with some overlap; (d) 0.1 < R < 0.25, similar with some differences; (e) R < 0.1, similar [46]. The experimental groups having separate and significantly different bacterial communities are highlighted in bold and underlined. Sample groups showing p-value with * had low sample numbers, so they did not have sufficient itineration during analysis