Open Access

Table 3

Number of snail habitats disappeared in 2016–2017 in relation to the cause of population decline and the type of habitat. A/B, sites inhabited by Galba truncatula/sites inhabited by Omphiscola glabra.

Cause of population decline Number of disappeared habitats: A/B *

Furrows (39/21) Road ditches (35/34) Pools (48/31) Streams (12/12) Ponds (15/6)
Mechanical cleaning 2/1 13/11 1/2 0/0 1/0
Subsurface drainage 4/5 0/0 8/5 0/0 0/0
Vegetation gyro-crushing 13/9 11/9 11/10 3/2 4/1
Cattle trampling 1/0 0/0 19/11 3/2 0/1
Periodic drying out of ponds* 0/0 0/0 0/0 5/5 8/4
Straightening of stream or pond banks 0/0 2/1 0/0 1/0 0/0
Not determined 19/6 9/13 9/3 0/3 2/0
*

Usually every three years.

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