Table 2.
Differences in reproductive measures and parasite infections between low and high exposure treatments throughout the three sampling periods
| Species | Week 3 | Week 6 | Week 9 | |||
|---|---|---|---|---|---|---|
| Test statistic | P | Test statistic | P | Test statistic | P | |
| Paracalliope fluviatilis | ||||||
| Fecundity | ||||||
| Mean eggs/female | F1,10 = 44.7 | <0.0001 | F1,10 = 5.5 | 0.041 | F1,10 = 1.02 | 0.34 |
| Presence of eggs | χ2 = 1.8 | 0.18 | χ2 = 0.3 | 0.56 | χ2 = 1.58 | 0.21 |
| Pairing | χ2 = 1.4 | 0.23 | χ2 = 7.9 | 0.0049 | χ2 = 6.7 | 0.0096 |
| Parasite prevalence | ||||||
| A. galaxii | χ2 = 8.5 | 0.0036 | χ2 = 1.5 | 0.22 | χ2 = 3.5 | 0.08* |
| M. poulini | χ2 = 42 | <0.0001 | χ2 = 14 | 0.0002 | χ2 = 23 | <0.0001 |
| C. parvum | χ2 = 29 | <0.0001 | χ2 = 3.8 | 0.05 | χ2 = 1.5 | 0.22 |
| M. poulini and C. parvum | χ2 = 18 | <0.0001 | χ2 = 7.4 | 0.007 | χ2 = 2.6 | 0.11 |
| Parasite abundance | ||||||
| A. galaxii | F1,612 = 5.2 | 0.022 | F1,1113 = 0.87 | 0.35 | F1,2135 = 1.7 | 0.19 |
| M. poulini | F1,612 = 39 | <0.0001 | F1,1113 = 9.88 | 0.0017 | F1,2135 = 16.7 | <0.0001 |
| C. parvum | F1,612 = 36 | <0.0001 | F1,1113 = 2.1 | 0.15 | F1,2135 = 1.8 | 0.19 |
| Paracorophium excavatum | ||||||
| Fecundity | ||||||
| Mean eggs/female | F1,55 = 0.0056 | 0.94 | – | – | – | – |
| Presence of eggs | χ2 = 0.006 | 0.94 | – | – | – | – |
| Parasite prevalence | ||||||
| H. spinigera | – | – | – | – | χ2 = 3.5 | 0.06* |
| M. poulini | χ2 = 1.5 | 0.22 | χ2 = 2.1 | 0.15 | χ2 = 1.5 | 0.22 |
| C. parvum | χ2 = 1.5 | 0.23 | χ2 = 0.48 | 0.49 | χ2 = 0.70 | 0.40 |
| M. poulini and C. parvum | χ2 = 1.4 | 0.24 | χ2 = 0.44 | 0.51 | χ2 = 1.5 | 0.23 |
| Parasite abundance | ||||||
| H. spinigera | – | – | – | – | F1,66 = 2.8 | 0.099* |
| M. poulini | F1,55 = 3.9 | 0.05 | F1,48 = 1.3 | 0.26 | F1,66 = 0.012 | 0.92 |
| C. parvum | F1,55 = 3.5 | 0.065* | F1,48 = 0.77 | 0.38 | F1,66 = 0.2 | 0.65 |
| Austridotea annectens | ||||||
| Parasite prevalence | ||||||
| M. poulini | χ2 = 19 | <0.0001 | χ2 = 0.58 | 0.45 | χ2 = 14 | 0.0002 |
| Parasite abundance | ||||||
| M. poulini | F1,90 = 15 | 0.0002 | F1,65 = 2.73 | 0.1 | F1,64 = 18 | <0.0001 |
| Austridotea lacustris | ||||||
| Fecundity | ||||||
| Mean eggs/female | – | – | χ2 = 0.3 | 0.59 | χ2 = 1.1 | 0.31 |
| Presence of eggs | – | – | F1,45 = 0.03 | 0.86 | F1,46 = 1.6 | 0.2 |
| Pairing | – | – | χ2 = 3.2 | 0.07* | χ2 = 3.2 | 0.07* |
Differences in the presence of eggs, pairing and parasite prevalence were examined using contingency analysis (d.f. = 1). Variation in the mean number of eggs per female and parasite abundance were examined using analysis of variance. Significant differences are bolded, and trends marked with *.