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Table 1

Main characteristics of the 14 watercress beds studied in 2016–2018 in northern Haute Vienne, with indication of the number of Fasciola hepatica metacercariae.

Type of watercress bed Length of the macrophyte-free zone (m) Number of beds Length of the bed in m (area in m2) Flow speed (cm/s)* Number of cysts over 3 years
Total Means (SD)
With a slow-flow spring 0.13–0.24 3 6.6–9.2 (2.9–4.1) 0.5–1.7 89 29.6 (17.3)
1.1–1.8 2 6.3–7.9 (2.8–3.5) 0.9–2.1 81 40.5 (27.5)
3.1–3.5 2 7.8–9.5 (3.5–4.2) 0.7–1.6 50 25.0 (12.5)
With a faster-flow spring 0.15–0.29 2 6.4–6.9 (2.8–3.1) 5.2–6.7 93 46.5 (15.2)
1.3–1.6 2 8.1–11.2 (3.6–5.0) 4.3–7.2 51 25.5 (8.4)
3.0–3.2 3 9.3–12.2 (4.1–5.4) 5.4–8.2 4 1.3 (0.4)
*

Two records per year and per furrow over a three-year period. The records were collected in early April with a 3-day interval between 10 a.m. and 11 a.m.

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