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Distribution of 334 populations for Galba truncatula and 165 for Omphiscola glabra observed in the 57 farms according to the surface area of their habitat in March or April: G. truncatula before 1998 (a) and in 2016–2017 (b), O. glabra before 1998 (c) and in 2016–2017 (d). The total number of populations in 2016–2017 is given in Table 2 for each habitat type.
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