TABLE 2.

Measures of α diversity for the samples characterized by Sogin et al. (27) for three OTU definitions^a

Sample	No. of reads	0.03			0.05			0.10
		OTU	Chao	H′	OTU	Chao	H′	OTU	Chao	H′
53R	12,725	1,599	3,222	5.29	1,420	2,622	5.19	1,053	1,733	4.81
55R	9,848	1,469	2,994	5.54	1,302	2,496	5.43	962	1,741	5.03
112R	15,057	2,258	5,189	5.91	2,032	4,282	5.79	1,584	2,992	5.44
115R	16,181	1,749	3,600	5.31	1,552	3,088	5.21	1,135	1,919	4.83
137	13,831	1,425	2,687	5.44	1,295	2,430	5.36	989	1,645	5.07
138	12,938	1,425	2,542	5.24	1,253	2,131	5.14	957	1,479	4.81
FS312	54,894	4,371	10,691	5.23	3,948	9,259	5.16	3,095	6,409	4.94
FS396	80,769	4,359	10,208	4.67	3,806	8,609	4.60	2,804	5,437	4.42

^a0.03, 0.05, and 0.10 are the OTU cutoffs in distance units. OTU signifies the number of OTUs observed, Chao signifies the Chao1 estimated minimum number of OTUs, and H′ signifies the nonparametric Shannon diversity index.