TABLE 3.

Diversity estimators for pairwise comparisons of 16S rRNA sequences

Site	Sequence difference for site:
	4/98-M	10/98-M	4/99-M	10/99-S	10/99-M	10/99-D
4/98-M	2.78a	0.09c	0.14	0.11	0.54	0.08
10/98-M	3.46b	3.53	0.10*	0.07	0.53	0.03*
4/99-M	3.70	3.97	3.61	0.13	0.51	0.12
10/99-S	2.85	3.12	3.40	2.28	0.53	−0.02*
10/99-M	18.10	18.12	18.09	17.21	13.94	0.56
10/99-D	2.78	3.05	3.36	2.28	17.48	2.36

^aMean pairwise sequence differences within (π_W) sites are on the diagonal in boldface.

^bMean pairwise sequence differences between (π_B) sites are below the diagonal in italices.

^cPairwise population Fst values are above the diagonal. An asterisk indicates a nonsignificant (P > 0.05) observed Fst value compared to Fst values from 100 randomizations of the sequences; i.e., it indicates random structuring of sequences.