FIGURE 7.

Breeding success in relation to breeding time within season. Average number of ringed nestlings per hatching day‐of‐year for pied flycatchers breeding in Sweden from 1982–2017 split by three latitudinal bands. Linear regression of ringed nestlings ~ hatching day‐of‐year: southern, b (slope) = −0.05, SE = 0.005, t ₁₀₈ = −10.55, adjusted R ² = 0.50, p < .001; intermediate, b = −0.04, SE = 0.005, t ₉₀ = −9.39, adjusted R ² = 0.49, p < .001, and northern, b = −0.08, SE = 0.005, t ₈₆ = −14.32, adjusted R ² = 0.70, p < .001. Linear regressions with p ≤ .05 (solid lines), standard errors (bars), and confidence intervals (shaded) are shown