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Table 3.
Distribution of 1987 habitats colonized by Galba truncatula on the 162 farms before 1993 and in 2013–2016 in relation to the type and area of habitat. The total number of snail habitats is given after each type of habitat (first column).
| Parameters | Number of habitats colonized by Galba truncatula
|
|||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Before 1993 | From 2013 to 2016 | |||||||||
| Snail area (m2) | 0.1–1 | 1.1–2 | 2.1–3 | 3.1–4 | >4 | 0.1–1 | 1.1–2 | 2.1–3 | 3.1–4 | >4 |
| Type of snail habitat | ||||||||||
| Drainage furrows (1598) | 314 | 734 | 463 | 85 | 2 | 306 | 752 | 413 | 127 | 0 |
| Road ditches (147) | 0 | 1 | 34 | 71 | 41 | 0 | 5 | 31 | 74 | 37 |
| Spring heads (102) | 41 | 54 | 7 | 0 | 0 | 45 | 55 | 2 | 0 | 0 |
| Streams (47) | 2 | 11 | 20 | 9 | 5 | 4 | 9 | 22 | 10 | 2 |
| Drainage ditches (41) | 6 | 17 | 13 | 5 | 0 | 4 | 18 | 15 | 3 | 1 |
| Pools and ponds (41) | 0 | 0 | 17 | 15 | 9 | 0 | 1 | 16 | 17 | 7 |
| Trampled areas (11) | 0 | 0 | 3 | 3 | 5 | 0 | 0 | 2 | 5 | 4 |
| All types (1987) | 363 | 817 | 557 | 188 | 62 | 359 | 840 | 501 | 236 | 51 |
| Frequency (%) | 18.2 | 41.1 | 28.0 | 9.4 | 3.1 | 18.0 | 42.2 | 25.2 | 11.8 | 2.5 |
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