Open Access
Table 2
Number of populations for Galba truncatula and Omphiscola glabra in 2016–2017 and 2020–2021 in the farms investigated in the department of Indre on sedimentary soils.
| Habitat type | Number of populations and decline rate between the two periods | |||||
|---|---|---|---|---|---|---|
|
|
||||||
| Galba truncatula | Omphiscola glabra | |||||
| 2016–17 | 2020–21 | Decline | 2016–17 | 2020–21 | Decline | |
| Drainage swales | 162 | 110 | 32.1 | 71 | 57 | 19.8 |
| Spring pools | 46 | 36 | 21.8 | 22 | 18 | 18.2 |
| Road ditches | 136 | 117 | 13.9 | 110 | 98 | 11.9 |
| Pond banks | 11 | 4 | 63.7 | 1 | 1 | 0 |
| Stream banks | 6 | 4 | 33.3 | 1 | 0 | 100.0 |
| All types | 361 | 271 | 25.0 | 205 | 174 | 15.2 |
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