Open Access
Table 1
Main characteristics of the different snail habitats, with indications of the number of snail samples.
| Type of snail habitat (number of farms or beds) | Period of study | Snail samples | Number of snails per sample | |
|---|---|---|---|---|
| Number per farm or per bed | Total number | |||
| Grasslands on farms | ||||
| Systematic survey for fasciolosis (234) |
1970-2006 | 2, 3 or 4 | 515 | From 100 to 150 (several habitats per farm) |
| Experimental transplantations (25) | 1986-1995 | 10 | 250 | 50 or 100 (a single habitat per farm)* |
| Wild watercress beds | ||||
| Regular sampling (45) | 1974-1989, 1990-2006 |
1 or 2, 15 |
68, 675 |
From 10 to 50 per bed* |
| Irregular sampling (76) | 1974-1998 | 4 | 304 | From 10 to 50 per bed* |
| Totals | – | – | 1812 | |
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