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Table 3.
Main characteristics of P. daubneyi infection in snails maintained to a constant temperature of 20 °C (controls), or subjected every week to a 3-h stay at a mean temperature of 12 °C (TC, temperature-challenged; CS, cercariae-shedding; SD, standard deviation).
| Parameters | Population (A) |
Population (B) |
||
|---|---|---|---|---|
| Controls | TC snails | Controls | TC snails | |
| Number of snails at day 30 p.e. | 44 | 45 | 39 | 40 |
| Number (frequency in %): | ||||
| CS snails | 7 (15.9) | 38 (84.4)* | 8 (20.5) | 21 (52.5)* |
| NCS snails | 31 (70.4) | 4 (8.8) | 13 (33.3) | 3 (7.5) |
| Prevalence of infection (%) | 86.3 | 93.3 | 53.8 | 60.0 |
| Mean growth (SD) of CS snails during experiment (mm) | 3.3 (1.1) | 3.5 (1.0) | 2.1 (0.9) | 2.3 (0.8) |
| Mean length (SD) in days: | ||||
| Prepatent period | 69.5 (10.6) | 68.7 (11.2) | 70.3 (8.0) | 68.4 (8.9) |
| Patent period | 27.6 (12.9) | 41.5 (7.3)* | 24.1 (10.3) | 36.7 (6.8)* |
| Mean number (SD): | ||||
| Floating mcc | 0.7 (0.4) | 1.5 (0.9) | 1.3 (0.7) | 2.4 (1.0) |
| Fixed and complete mcc | 91.4 (47.2) | 204.8 (81.0)* | 74.6 (38.5) | 156.4 (62.3)* |
| Fixed and incomplete mcc | 0 | 5.6 (1.7)* | 1.2 (0.5) | 4.8 (1.2)* |
| Total mcc production: | ||||
| Per CS snail | 92.1 | 211.9 | 77.1 | 163.6 |
| Per snail at day 30 p.e. | 14.6 | 178.9 | 15.8 | 85.9 |
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