Table 4.

Results of cluster analysis examining the similarity among 21 strains of Pristionchus pacificus in their chemoattraction responses toward: all compounds, organic compounds only, and beetle washes only

		All compounds			Organic compounds			Beetle washes
Step	No. of clusters	S	D	No.	S	D	No.	S	D	No.
1	20	87.572	0.248	2	88.231	0.235	2	99.665	0.007	2
2	19	81.215	0.376	2	87.693	0.246	2	99.199	0.016	2
3	18	80.852	0.383	2	86.084	0.278	2	99.015	0.020	2
4	17	80.496	0.391	4	84.509	0.310	2	98.502	0.030	2
5	16	80.166	0.397	2	82.857	0.417	3	98.000	0.040	3
6	15	80.001	0.400	6	82.005	0.360	4	97.511	0.050	2
7	14	79.703	0.406	8	81.235	0.375	5	97.483	0.050	2
8	13	79.151	0.417	2	80.639	0.387	6	97.273	0.055	5
9	12	79.151	0.417	2	79.872	0.403	8	97.187	0.056	3
10	11	78.040	0.439	10	78.166	0.437	9	96.845	0.063	8
11	10	77.543	0.449	11	77.121	0.458	2	96.186	0.076	9
12	9	77.402	0.452	12	76.156	0.477	11	95.862	0.083	10
13	8	76.226	0.475	13	75.990	0.480	13	95.411	0.092	3
14	7	76.078	0.478	14	75.563	0.489	14	94.974	0.101	12
15	6	74.008	0.520	16	75.284	0.494	16	94.529	0.109	13
16	5	72.993	0.540	17	74.483	0.510	17	94.350	0.123	2
17	4	72.631	0.547	18	74.039	0.519	18	94.167	0.117	16
18	3	72.576	0.548	19	72.928	0.541	19	93.863	0.123	17
19	2	71.581	0.568	20	66.591	0.668	20	84.037	0.319	19
20	1	55.826	0.883	21	56.567	0.869	21	66.843	0.663	21

S, similarity level; D, correlation coefficient distance; No., number of observations in cluster.