Table 2.

The alpha diversity indexes in each group.

	Observed species	Shannon	Simpson	Chao1
Group 1	183.19 ± 52.43	3.617 ± 1.074	0.7558 ± 0.1564	223.71 ± 63.87
Group 2	167.48 ± 44.38	3.524 ± 1.098	0.7158 ± 0.1561	190.93 ± 52.63
Group 3	127.06 ± 25.59	2.480 ± 0.905	0.5168 ± 0.1597	152.13 ± 34.19
Group 1 vs group 2	0.098	0.635	0.217	0.009
Group 1 vs group 3	0.000	0.000	0.000	0.000
Group 2 vs group 3	0.000	0.000	0.000	0.000

Observed species, indicating the number of species (OTU) in the sample; Shannon, computed at the RDP Pyrosequencing Pipeline; Simpson, calculated with MOTHUR [20] using a distance matrix computed at RDP Pyrosequencing Pipeline; Chao1, the estimated richness of an environment based on 0.03 cutoff.