TABLE 5.

Abundance-based microbial community analysis by SONS^a

Community analyzed by SONS and parameter	Stirred vs unstirred				Impacted vs unimpacted
	HL	SM	SR	VM	Stirred	Unstirred
Archaeal
Shared Chaob	6.6	37.7	29.0	10.9	47.0	15.3
ThetaYCc	0.15	0.71	0.72	0.67	0.15	0.22
Jaccard indexd	0.40	0.78	0.53	0.63	0.74	0.35
Sorensen indexd	0.57	0.88	0.69	0.77	0.85	0.52
Bacterial
Shared Chao	3.5	7.5	20.8	19.0	5.8	10.5
ThetaYC	0.87	0.90	0.95	0.72	0.08	0.09
Jaccard index	0.33	0.63	0.98	0.89	0.58	0.77
Sorensen index	0.50	0.77	0.99	0.94	0.74	0.87

^aCommunity similarities are compared at each site between treatments as well as between agriculturally impacted versus unimpacted sites for each treatment.

^bEstimate of the number of OTUs that are shared between the two communities.

^cNonparametric maximum-likelihood estimate of similarity (65).

^dThe probability that a randomly selected OTU is found in both communities (given that it is in at least one of the communities).