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Table 1.

Frequency of sites colonized by Lymnaea glabra and containing infected snails in relation to the type of habitat and digenean species. n, total number of habitats colonized by the lymnaeid.

Parasite species Number of habitats containing infected snails (frequency in %)
Drainage furrows (n: 37) Road ditches (n: 86) Pools (n: 28) Pond banks (n: 31) Brooks (n: 24) All sites (n: 206)
Calicophoron daubneyi 14 (37.8) 7 (8.1) 3 (10.7) 0 0 24 (11.6)
Echinostoma revolutum 0 0 0 2 (6.4) 0 2 (0.9)
Fasciola hepatica 17 (45.9) 11 (12.7) 1 (3.5) 1 (3.2) 0 30 (14.5)
Haplometra cylindracea 2 (5.4) 0 7 (25.0) 0 3 (12.5) 11 (5.3)
Notocotylus sp. 1 (2.7) 2 (0.2) 3 (10.7) 2 (6.4) 1 (4.1) 9 (4.3)
Opisthoglyphe ranae 0 0 5 (17.8) 7 (22.5) 0 12 (5.8)
Plagiorchis sp. 0 0 0 3 (9.6) 0 3 (1.4)
Immature infections
 with rediae 1 (2.7) 0 0 2 (6.4) 2 (8.2) 5 (2.4)
 with sporocysts 3 (10.0) 1 (0.1) 0 3 (9.5) 1 (4.1) 8 (4.0)
Xiphidiocercariae (unidentified species) 0 0 7 (25.0) 2 (6.4) 1 (4.1) 10 (4.8)
Number of parasite species 4 3 5 5 2 7

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