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Table 2

Number of Fasciola hepatica metacercariae and weight of dripped plants in relation to the type of watercress bed and the year. The number of cysts per kg of plants was calculated on all metacercariae, without taking into account the type of bed.

Parameter, type of bed and year Nasturtium officinale Callitriche sp. Helosciadium nodiflorum Juncus effusus Veronica beccabunga
Total number of cysts (plants in kg)
 Slow-flow spring
  2016 49 (10.3) 9.1 (1.2) 29 (7.2) 3 (2.4) 5 (2.2)
  2017 27 (8.7) 3 (1.1) 19 (5.5) 8 (1.2) 7 (2.6)
  2018 39 (8.6) 2 (0.8) 15 (4.8) 2 (1.1) 1 (2.5)
  The three years 115 (27.6) 16 (3.1) 63 (17.5) 13 (4.7) 13 (7.3)
 Faster-flow spring
  2016 15 (5.9) 4 (1.2) 13 (4.4) 2 (1.1) 1 (2.7)
  2017 38 (7.4) 1 (0.7) 25 (5.6) 1 (1.7) 0 (3.2)
  2018 20 (7.8) 1 (1.0) 24 (5.9) 2 (1.6) 1 (1.8)
  The three years 73 (21.1) 6 (2.9) 62 (15.9) 5 (4.4) 2 (7.7)
Number of cysts per kg of plant
 Total number of cysts 188 22 125 18 15
 Dripped plants (kg) 48.7 6.0 33.4 9.1 15.0
 Means ± SD 3.8 ± 0.7 3.6 ± 0.7 3.7 ± 0.6 1.9 ± 0.4 1.0 ± 0.4

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