Table 2 Relative abundance (%) of OTUs in bacterial 16S rRNA gene v4v6 sequence libraries. Sequences with ≥1% abundance frequency are shown in detail. The data are from three PCR-generated amplicon samples that were pooled before sequencing

OTUs

MM

planktonic

MM garnet

MM

glass

OS

planktonic

OS

garnet

OS

glass

Unknown phylum

29.4

7.51

13.0

50.0

2.54

3.05

Actinobacteria ^a

-

-

-

1.62

-

-

Atribacteria ^a

1.18

-

-

20.6

-

-

Gracilibacteria ^a

5.30

9.85

2.16

-

-

-

Gammaproteobacteria ^b

12.3

7.89

4.44

-

-

-

Thermoplasmata ^b

-

-

-

2.75

-

-

Desulfuromonadales ^c

-

-

-

-

-

1.21

Ignavibacteriales ^c

-

-

-

8.13

-

-

Myxococcales ^c

-

-

-

-

1.29

1.37

Hydrogenophilaceae ^d

-

-

1.30

-

-

-

Rhodocyclaceae ^d

-

1.57

-

-

15.7

27.6

Desulfatiglans ^e

3.30

-

-

-

-

-

Desulfobulbus ^e

-

3.22

-

-

-

-

Desulfocapsa ^e

-

-

-

-

5.33

8.74

Ferritrophicum ^e

-

3.07

1.32

-

-

-

Marichromatium ^e

1.86

-

-

-

-

-

Sideroxydans ^e

-

-

2.95

-

-

-

Sulfurimonas ^e

-

48.7

50.9

-

68.2

50.6

Sulfurovum ^e

-

3.78

8.41

-

-

-

Syntrophus ^e

3.78

-

-

2.40

-

-

Candidate division OP3^f

12.6

-

3.21

-

-

-

Candidate Nitrotoga^f

-

4.59

4.50

-

-

1.11

Omnitrophica^f

-

-

-

1.15

-

-

Parcubacteria^f

11.7

-

-

7.54

-

-

TA06^f

-

-

1.22

-

-

-

<1%

18.6

9.80

6.58

5.78

6.92

6.26