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Table 6.
Distribution of 866 habitats colonized by Omphiscola glabra on the 162 farms before 1993 and in 2013–2016 in relation to the type of habitat and the number of overwintering snails counted in March or April. The total number of snail habitats is given after each type of habitat (first column).
| Parameters | Number of habitats colonized by Omphiscola glabra
|
||||||||
|---|---|---|---|---|---|---|---|---|---|
| Before 1993 | From 2013 to 2016 | ||||||||
| Snail density/m2 | ≤5 | 5.1–10 | 10.1–15 | >15 | ≤5 | 5.1–10 | 10.1–15 | >15 | |
| Type of snail habitat | |||||||||
| Drainage furrows (655) | 101 | 304 | 167 | 83 | 261 | 289 | 86 | 19 | |
| Road ditches (77) | 16 | 44 | 13 | 4 | 31 | 36 | 8 | 2 | |
| Drainage ditches (47) | 35 | 11 | 1 | 0 | 40 | 7 | 0 | 0 | |
| Spring heads (34) | 16 | 14 | 3 | 1 | 21 | 10 | 2 | 1 | |
| Streams (28) | 4 | 16 | 7 | 1 | 12 | 13 | 3 | 0 | |
| Pools and ponds (23) | 19 | 3 | 1 | 0 | 18 | 4 | 1 | 0 | |
| Trampled areas (2) | 2 | 0 | 0 | 0 | 2 | 0 | 0 | 0 | |
| All types of habitats (866) | 193 | 392 | 192 | 89 | 385 | 359 | 100 | 22 | |
| Frequency (%) | 22.2 | 45.2 | 22.1 | 10.2 | 44.4 | 41.4 | 11.5 | 2.5 | |
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