Table 4. AMOVA analysis of 16S tag pyrosequencing data from pipe samples.
| Comparison | p value |
| August-July | <0.001 |
| August-December | <0.001 |
| August-March | 0.0497 |
| July-December | <0.001 |
| July-March | 0.0500 |
| December-March | 0.0487 |
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