Table 1 Metal levels (mg/kg) of dried unshelled snails used in tests and pH of lakes (X ± SD)
| Â | Cadmium | Lead | Zinc | pH |
|---|---|---|---|---|
Reference lakes | ||||
 Areush | * | * | 4.48 | 7.3 (0.4) |
 Badger | * | 0.53 | 5.78 | 7.0 (0.4) |
 Bayit | * | * | * | 7.1 (0.3) |
 Deer | * | 0.63 | 14.10 | 6.7 (0.4) |
 Hauser | * | * | 8.10 | 6.9 (0.2) |
 Hick | * | * | 4.93 | 7.2 (0.2) |
 Mecca | * | * | 2.33 | 7.0 (0.1) |
 Worm | * | 1.30 | 6.29 | 6.8 (0.4) |
 Williams | * | * | 5.35 | 7.0 (0.3) |
Metal polluted lakes | ||||
 Anderson | * | 5.59 | 11.20 | 7.3 (0.5) |
 Bull Run | * | 7.15 | 24.80 | 7.0 (0.4) |
 Farm | * | * | 14.15 | 6.7 (0.3) |
 Goose | * | * | 14.35 | 7.1 (0.2) |
 Killarney | * | 0.71 | 15.86 | 7.1 (0.3) |
 Mile 109 | * | * | 13.81 | 7.2 (0.2) |
 Mile 109.5 | * | 0.79 | 14.66 | 7.2 (0.4) |
 Porter | * | 1.29 | 16.65 | 6.9 (0.4) |
 Rose | * | 7.37 | 34.56 | 6.9 (0.3) |
 Thompson |  | 5.53 | 10.60 | 6.9 (0.5) |