Table 1. Standard diversity indices with F-statistics analysis of cercariae samples at levels of villages or individual snails.

	No. of infected snails	No. of cercariae genotyped	No. of alleles per locus	Ho (SD)	He (SD)	f (95%CI)	F ST (among snails) (95%CI)
Guanghui (M)
2006	34	85	8.17	0.333(0.145)	0.675(0.201)	0.335(0.051,0.505)	0.269(0.203,0.319)
2007	39	140	9.05	0.400(0.148)	0.675(0.198)	0.089(−0.164,0.304)	0.413(0.227,0.559)
Heping (M)
2006	39	79	7.54	0.280(0.141)	0.663(0.216)	0.348(0.098,0.576)	0.360(0.292,0.421)
Xingzhuang (M)
2006	31	81	8.61	0.330(0.179)	0.700(0.225)	0.314(−0.041,0.604)	0.323(0.258,0.372)
2007	27	72	9.14	0.384(0.150)	0.714(0.201)	0.103(−0.110,0.334)	0.471(0.251,0.639)
Longquan (H)
2006	27	45	6.05	0.313(0.219)	0.584(0.250)	0.264(−0.014,0.510)	0.284(0.220,0.372)
2007	30	67	5.93	0.391(0.214)	0.603(0.246)	0.023(−0.269,0.289)	0.359(0.120,0.582)
Longshang (H)
2006	27	46	5.30	0.297(0.259)	0.552(0.244)	0.240(−0.183,0.703)	0.303(0.133,0.396)
2007	27	53	3.55	0.435(0.329)	0.481(0.300)	−0.298(−0.454,0.006)	0.103(−0.057,0.373)
Yuantou (H)
2006	23	31	4.02	0.357(0.293)	0.434(0.304)	0.030(−0.376,0.440)	0.159(0.023,0.246)
2007	34	85	4.34	0.396(0.325)	0.467(0.321)	−0.199(−0.536,0.152)	0.158(−0.210,0.435)

Note: No. of alleles per locus, with rarefaction including 38 genes per sample; Ho, observed heterozygosity over 6 loci; He, expected heterozygosity over 6 loci; M, marshland; and H, hilly region.