Table 4.
Analyses (ANCOVAs) of the mean numbers of water mites in 2003 and 2004 and for the mean number of gregarines in 2004 in Coenagrion puella males and females (coded as colour class). In all three analyses body size was accounted for by using head width as a covariate.
| Year and parasite | source | df | F | P |
| 2003, water mites | 'colour class' | 3 | 0.605 | 0.612 |
| population | 1 | 12.201 | 0.001 | |
| 'colour class' × population | 3 | 1.886 | 0.682 | |
| head width | 1 | 8.397 | 0.004 | |
| 2004, water mites | 'colour class' | 3 | 2.261 | 0.082 |
| head width | 1 | 11.428 | 0.001 | |
| 2004, gregarines | 'colour class' | 3 | 0.419 | 0.740 |
| head width | 1 | 0.024 | 0.877 |