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Several species of Digenea use the snail Galba truncatula as an intermediate host for the development of their larval forms. Cercariae, which exited from the snail, encyst on various aquatic plants such as watercress. Although the list of these host plants is fairly well known at present, no information is available on the dispersion and distribution of these cercariae relative to the host plant species. Field investigations were therefore carried out for three years in 14 wild watercress beds located in open drainage furrows and crossed by running water. In each furrow, the population of G. truncatula lived around the emergence of a spring, while the bed was located further downstream on the course of the furrow. Five plant species were harvested in early April and examined for metacercariae using a stereomicroscope. Cysts belonging to four Digenea: Calicophoron daubneyi, Fasciola hepatica, Notocotylus sp. and an unidentified echinostomatid Annales Scientifiques du Limousin, 2020, 29, 2-21 DOI : : 10.25965/asl.1056 3 0765-0477 were observed on these plants. Most of these were observed on Nasturtium officinale (243 on 48.7 kg of drained leaves and stems), followed by Helosciadium nodiflorum (164 on 33.4 kg). On the other plant species, there were few larvae: from 18 to 25 per plant species. Most of the F. hepatica, Notocotylus sp. and echinostomatid cercariae formed cysts on the upper leaves and the area of stems just under the water surface, while those of C. daubneyi settled on the basal leaves and collar of the plants. In addition, the plants, on which most of these cercariae are encysted, grew in the most upstream part of each watercress bed (usually on the first 50 cm in length). When running water in the watercress bed was fast, the distribution of metacercariae was more limited and fewer in number than in the stations fed by a slow flow of water. Plants that grow on the most upstream section of a watercress bed in an open drainage furrow are the most used by cercariae of the four Digenea for their encystment. The speed of the water flow affects the number and distribution of metacercariae in the bed.

Répartition des métacercaires de quatre Digènes dans des cressonnières naturelles traversées par de l’eau courante