TABLE 3.

UPGMA jackknifing results

Node	% of trials with nodea
	17	20	31	36	40	58
N1	3	14	31	27	12	NA
N2	8	1	29	33	48	63
N3	1	8	7	11	NA	NA
N4	14	16	11	NA	NA	NA
N5	1	0	0	1	27	37
N6	27	36	57	67	53	63
N7	23	23	36	44	52	66
N8	22	17	17	39	31	37
N9	52	58	64	NA	NA	NA
N10	8	16	79	96	94	100
N11	6	12	40	46	NA	NA
N12	13	31	NA	NA	NA	NA
N13	16	38	41	38	64	79
N14	34	50	29	23	12	6
N15	69	77	NA	NA	NA	NA
N16	18	40	27	28	28	21
N17	24	35	43	46	37	50
N18	97	NA	NA	NA	NA	NA

^aFor each node in the UPGMA tree (Fig. 2) (rows), the numbers show the percentages of trials (n = 100) that the node occurred in when each environment was represented by only 17, 20, 31, 36, 40, or 58 sequences (columns). The node names correspond to the node labels in Figure 2. NA, not available.