Table 1 Overview of the high-throughput read analysis, including total OTUs and diversity statistics

Total OTUs (97%)

830 ± 33 a

615 ± 21 b

913 ± 56 c

969 ± 49 c

1130 ± 101 c

1239 ± 99 d

Diversity indices

 Shannon

5.52 ± 0.27 a

4.34 ± 0.14 b

7.15 ± 0.48 c

7.22 ± 0.26 c

6.61 ± 0.08 c

6.93 ± 0.14 c

 Simpson

0.0366 ± 0.0021 a

0.1573 ± 0.0018 b

0.0186 ± 0.0003 c

0.0147 ± 0.0005 c

0.0428 ± 0.0058 a

0.0125 ± 0.0043 d

 Chao-1

855 ± 124 a

794 ± 96 a

932 ± 36 b

991 ± 59 b

1266 ± 106 c

1359 ± 218 c

 Coverage

0.99 ± 0.01

0.99 ± 0.01

0.99 ± 0.01

0.99 ± 0.01

0.99 ± 0.01

0.99 ± 0.01