Table 2. Similarity-based OTUs estimates at a 3% dissimilarity level.

Field 1	2007				2008				2009
	First sampling time				First sampling time				First sampling time
	Untreated		Glyphosate		Untreated		Glyphosate		Untreated		Glyphosate
	M+D+M	ESPRIT	M+D+M	ESPRIT	M+D+M	ESPRIT	M+D+M	ESPRIT	M+D+M	ESPRIT	M+D+M	ESPRIT
OTUs	631	597	632	571	604	587	655	588	756	622	734	621

The species richness estimates were determined by using the MUSCLE, DNADIST and Mothur (M+D+M) combination or the ESPRIT program, as described in Materials and Methods.