Table 3. Percentage of total sequences assigned to most dominant taxa. Data presented include the top 4 abundant phyla/classes across samples.

Phyla/Class	Family/Genera	BW1	BW2	BW3	HW1	HW2	HW3
α-proteobacteria	Sphingomonadales	7.99	5.20	1.42	0.06	1.27	3.41
	SAR11	1.89	0.00	2.41	16.78	8.14	6.01
	Rhodobacterales	1.39	3.37	1.86	0.50	1.21	4.80
γ-proteobacteria	Alteromonadales	5.14	2.57	3.96	2.51	4.86	16.28
	Oceanospirillales	13.10	1.67	25.11	2.11	1.46	3.59
	Pseudomonadales	0.28	0.06	0.09	2.35	0.40	2.85
	Thiotrichales	1.49	54.46	36.16	0.09	0.09	0.09
Bacteroidetes	Flavobacteriales	3.62	10.68	21.20	6.16	3.38	10.40
	Sphingobacteriales	11.18	0.71	0.93	0.62	1.08	0.40
Chloroflexi	Caldilineales	18.95	0.00	0.00	0.25	0.25	0.03
Cyanobacteria	Synechococcus	0.03	0.06	1.18	42.94	46.01	29.07
	Unclassified	0.37	1.83	0.06	7.89	10.65	3.59

Family/genera representing >1% of total sequences assigned were selected for comparison.