Table 1. Selection differentials (S) of trichome density, atropine, and scopolamine concentration in eight populations of Datura stramonium.

Population	Main herbivore	Defensive trait	S	SE	t	P
Acolman (N = 31)	Lema daturaphila	Trichome density	0.116	0.192	0.604	0.55
		Atropine	0.416	0.182	−2.284	0.029
		Scopolamine	−0.089	0.197	−0.456	0.652
Patria Nueva (N = 30)	Lema daturaphila	Trichome density	−0.197	0.103	−1.905	0.067
		Atropine	−0.183	0.104	−1.753	0.09
		Scopolamine	−0.269	0.097	−2.756	0.01
Joquicingo (N = 31)	Lema daturaphila	Trichome density	−0.234	0.184	−1.277	0.211
		Atropine	−0.303	0.187	−1.62	0.116
		Scopolamine	−0.036	0.195	−0.186	0.854
San Martín (N = 29)	Lema daturaphila	Trichome density	0.205	0.151	1.36	0.186
		Atropine	−0.331	0.142	−2.332	0.027
		Scopolamine	−0.106	0.154	−0.685	0.499
Tzin Tzun Tzan (N = 30)	Epitrix parvula	Trichome density	−0.347	0.099	−3.488	0.001
		Atropine	−0.151	0.122	−1.233	0.228
		Scopolamine	0.107	0.128	0.837	0.41
Valsequillo (N = 33)	Epitrix parvula	Trichome density	−0.051	0.099	−0.552	0.605
		Atropine	−0.255	0.088	−2.89	0.006
		Scopolamine	−0.052	0.099	−0.533	0.598
Sanabria (N = 34)	Sphenarium purpurascens	Trichome density	−0.188	0.187	−1.004	0.324
		Atropine	−0.228	0.178	−1.281	0.209
		Scopolamine	−0.071	0.182	−0.39	0.699
Santo Domingo (N = 30)	Sphenarium purpurascens	Trichome density	−0.083	0.204	−0.409	0.686
		Atropine	−0.392	0.191	−2.055	0.049
		Scopolamine	0.65	0.164	3.965	0.001

Significant values appear in bold-type fonts. Standard error (SE) of estimates, t-test value, and probability (P) are provided.