|
Population
|
Lymnaea fuscus
|
Radix balthica
|
Galba truncatula
|
Significant differences*
|
|---|
|
Number of snails:
| | | | |
|
- at exposure
|
100
|
100
|
100
| |
|
- at day 30 p.e. (%)
|
54 (54.0)
|
65 (65.0)
|
74 (74.0)
|
χ2 = 8.74, p < 0.05
|
|
Number of snails:
| | | | |
|
- CS
|
7
|
13
|
43
| |
|
- NCS
|
12
|
14
|
11
| |
|
Prevalence of infection (%)
|
35.1
|
41.5
|
72.9
|
χ2 = 21.99, p < 0.001
|
|
Shell growth (mm):
| | | | |
|
- CS
|
7.7 ± 1.5
|
6.0 ± 1.1
|
3.7 ± 0.9
|
F = 14.32, p < 0.001
|
|
- NCS
|
7.3 ± 1.1
|
5.7 ± 0.8
|
3.5 ± 1.1
|
F = 16.63, p < 0.001
|
|
Prepatent period in days
|
55.7 ± 6.5
|
57.1 ± 8.3
|
43.3 ± 5.2
|
F = 4.42, p < 0.05
|
|
Patent period in days
|
11.2 ± 4.7
|
16.1 ± 5.2
|
28.8 ± 7.3
|
F = 10.21, p < 0.001
|
|
Number of shed cercariae
|
80.3 ± 35.8
|
66.8 ± 21.2
|
157.1 ± 55.2
|
F = 7.10, p < 0.01
|
|
Cadavers of NCS snails:
| | | | |
|
- Free rediae
|
15.7 ± 5.2
|
18.3 ± 4.5
|
31.5 ± 5.3
|
F = 11.71, p < 0.001
|
|
- Free cercariae
|
137.6 ± 37.0
|
154.2 ± 52.9
|
236.5 ± 67.1
|
F = 4.68, p < 0.05
|
|
Percentage of shed cercariae**
|
58.3
|
43.3
|
66.4
| |
- *Mean values are given with their standard deviations for seven parameters. Each statistical comparison was performed using values recorded for the three lymnaeid species. CS, cercariae-shedding snails; F, value of ANOVA; NCS, non cercarial shedding snails containing cercariae; NS, non significant difference; p, probability; p.e., post-exposure; χ2, value of the χ2 test.
- **Number of cercariae shed by CS snails / overall cercarial production in NCS snails.
