Table 2.

Loadings of each hydrocarbon component on each of the six Principal Components in this study

Hydrocarbon1	ECL2	PC1	PC2	PC3	PC4	PC5	PC6
2-methyloctacosane	C28.65	0.225	0.019	−0.096	−0.175	0.109	−0.061
2-methyltricontane	C30.65	0.209	0.006	0.170	−0.064	0.125	−0.067
7- and 9-hentricontene	C30.78	0.155	0.121	0.304	−0.033	0.086	−0.014
Unknown	C32	0.111	0.057	−0.273	0.519	−0.013	−0.101
Unknown alkene	C33br1	0.178	−0.154	−0.065	0.044	0.147	−0.109
11- and 13-methyldotricontane	C33br2	0.220	−0.039	−0.075	−0.038	0.175	−0.241
Unknown alkene	C33br3	0.202	−0.155	−0.196	−0.050	0.315	−0.008
31-methyldotricont-8-ene	C32.47	0.182	−0.279	−0.032	−0.017	−0.352	−0.184
31-methyldotricont-6-ene	C32.56	0.121	0.107	0.057	0.056	0.675	0.123
8,24-tritricontadiene	C32.63	0.212	−0.016	0.020	−0.152	−0.259	−0.258
7,25-tritricontadiene	C32.70	0.161	0.045	0.189	−0.008	0.040	−0.331
10-, 12-, and 14-tritricontene	C32.79	0.192	−0.192	−0.134	−0.131	−0.026	0.247
Unknown	C32.86	0.145	−0.273	0.041	−0.019	−0.117	0.269
8,26-tetratricontadiene	C34diene1	0.204	0.164	−0.260	−0.095	−0.048	−0.042
6,24- and 6,26-tetracontadiene	C34diene2	0.191	0.197	−0.096	0.365	−0.095	−0.073
10-, 12-, and 14 tetretricontene	C34ene	0.167	−0.018	−0.133	0.441	0.063	0.098
33-methlytetratricont-10-ene	C35alk1	0.230	−0.129	−0.154	−0.079	0.124	−0.105
33-methlytetratricont-8-ene	C35alk2	0.221	−0.210	−0.106	−0.061	−0.083	0.061
Unknown alkene	C35alk3	0.235	−0.092	0.127	0.110	−0.031	−0.001
9,25-pentatricontadiene	C34.59	0.198	0.195	−0.263	−0.184	−0.093	−0.041
8,26-pentatricontadiene	C34.66	0.215	0.000	0.309	0.045	−0.031	0.035
7,27-pentatricontadiene	C34.73	0.120	0.116	0.240	0.148	−0.146	−0.123
Unknown diene	C36a	0.202	0.209	0.092	−0.006	−0.086	0.195
Unknown alkene	C36b	0.150	−0.040	0.142	0.318	−0.061	0.226
35-methylhexatricont-10-ene	C37br	0.077	0.049	0.304	−0.120	0.122	−0.400
9,27-heptatricontadiene	C36.5	0.196	0.070	−0.235	−0.237	−0.111	0.121
8,28-heptatricontadiene	C36.6	0.207	−0.121	0.121	−0.075	−0.020	0.215
14-, 16-, and 12-hexatricontene	C36.7	0.159	−0.155	0.344	0.066	−0.110	0.193
Unknown	C38	0.099	0.474	−0.014	0.005	−0.150	−0.033
Unknown	C39	0.129	0.413	−0.023	−0.065	−0.078	0.137
Unknown	C40	0.087	0.237	0.096	−0.204	0.050	0.369
Eigenvalue		14.333	2.792	2.374	1.666	1.316	0.984
Percentage of total variance		0.462	0.090	0.077	0.054	0.043	0.032

¹The 31 epicuticular hydrocarbon components in D. mojavensis included – most identified by GCMS; Etges and Jackson (2001), based on all adults in this study reared on both host cacti (n = 242).

²Equivalent chain length based on relative retention times with known standards.