Figure 1. Prevalence of APV infections in blood of nestlings and adult pied flycatchers in relation to presence or absence of nest ectoparasitic blowflies.

2005 nestlings: Fisher's exact test, P<0.0001; adult males: χ² ₁ = 6.00, P = 0.014; adult females: χ² ₁ = 5.99, P = 0.014; 2006 nestlings: χ² ₁ = 531.74, P<0.0001; adult males: χ² ₁ = 0.80, P = 0.370; adult females: χ² ₁ = 19.74, P<0.0001. The Yates' correction for continuity was applied. Numbers above bars are sample sizes (numbers of individuals).