Table 2. Relative abundance of individual phyla is depicted per season.

		Fall/Winter					Spring				MWU
Phyla	Mean (%)	SD (%)	Min (%)	Max (%)	absolute nr	Mean (%)	SD (%)	Min (%)	Max (%)	absolute nr	p-value
Proteobacteria	75.39	23.81	1.91	98.41	50	51.13	23.77	8.09	98.89	46	<0.001
Firmicutes	17.22	16.58	0.30	67.64	50	24.76	25.22	0.78	91.18	46	0.097
Bacteroidetes	3.39	8.99	0.00	43.45	27	19.31	16.62	0.00	55.42	42	<0.001
Actinobacteria	1.88	3.36	0.05	22.69	49	3.67	5.91	0.02	29.40	42	NS
Fusobacteria	1.75	8.14	0.00	48.00	7	0.98	6.62	0.00	44.88	1	NS
Cyanobacteria	0.27	0.44	0.00	2.54	32	0.09	0.13	0.00	0.74	14	0.029
OD1	0.067	0.086	0.000	0.38	12	0.046	0.054	0.000	0.19	9	NS
TM7	0.045	0.305	0.000	2.15	1	0.023	0.151	0.000	1.02	1	NS
Deinococcus-Thermus	0.015	0.030	0.000	0.14	3	0.008	0.014	0.000	0.06	0	NS
Nitrospira	0.005	0.012	0.000	0.05	0	0.001	0.005	0.000	0.02	0	0.103
Planctomycetes	0.001	0.008	0.000	0.06	0	0.002	0.013	0.000	0.08	0	NS
Chloroflexi	0.001	0.005	0.000	0.03	0	0.001	0.005	0.000	0.04	0	NS
BRC1	0.000	0.000	0.000	0.00	0	0.001	0.009	0.000	0.06	0	NS

Mean, SD, and Range of each phyla per group of samples are depicted for the samples obtained in fall/winter (n = 50) versus samples obtained in spring (n = 46).