Table 1. Mantel and partial Mantel tests for the correlation between community similarity and local environmental and regional factors using Spearman's coefficient.

Effects of	Controlling for	Abundant bacteria	Rare bacteria
Local		0.383**	0.470**
Regional		0.402**	0.325**
Local	Regional	0.331**	0.401**
Regional	Local	0.353**	0.190*

The significances are tested based on 999 permutations.

*P<0.05 and ^**P<0.01.