Table 2.
Infection prevalence among snails in experiments, expressed as the percentage of snails infected, with the raw counts of infected/total snails in parentheses
| Experiment | Treatment (level) | Prevalence | P-value | ||
|---|---|---|---|---|---|
| 1 | Chaetogaster density | ||||
| 0 | 63% (17/27) | 0.088 | |||
| 3 | 67% (12/18) | ||||
| 8 | 44% (12/27) | ||||
| 15 | 33% (6/18) | ||||
| 30 | 33% (6/18) | ||||
| Overall | 49% (53/108) | ||||
| 2 | Cercariae density | ||||
| 10 | 74% (14/19) | 0.078 | |||
| 20 | 58% (11/19) | ||||
| 30 | 79% (15/19) | ||||
| 40 | 100% (11/11) | ||||
| Overall | 75% (51/68) | ||||
| 3 | Cercariae density | ||||
| Chaetogaster density | 10 | 30 | 50 | 0.521 | |
| 0 | 100% (10/10) | 80% (8/10) | 100% (6/6) | ||
| 5 | 100% (10/10) | 100% (10/10) | 100% (7/7) | ||
| 10 | 70% (7/10) | 100% (10/10) | 100% (6/6) | ||
| 20 | 80% (8/10) | 80% (8/10) | 100% (6/6) | ||
| Overall | 91% (96/105) | ||||
| 4 | Zooplankton density | ||||
| 0 | 65% (13/20) | 0.748 | |||
| 15 | 58% (11/19) | ||||
| Overall | 62% (24/39) | ||||
P-values are from Fisher's exact tests (Experiments 1, 2, and 4) and a log-linear regression with Poisson distribution (Experiment 3) comparing infection prevalence among treatments.