Figure 1.
Percentage of caterpillars in nestling diet and caterpillar frass weights.
Both nestling diet and frass weights (g per day per frass-net) are shown in relationship with date (for frass-nets: mean date between two sampling events), for Sweden and The Netherlands. Dutch broods showed a steep decline in the proportion of caterpillars in the diet with date, which was not the case for Swedish birds where proportions were generally lower.
Figure 2.
Release-day in relation to 1st egg date.
The relationship between the release day of female pied flycatchers from the aviaries and date of 1st egg is shown for the three treatment groups. The duration between release from the aviaries and laying of the first egg varied from 2 to 19 days (all data points are above the x=y line) and declined with date, for each group. Each symbol indicates a nest, with separate regression lines for each treatment group. For graphical reasons, one data-point of Swedish controls was shifted +0.5 on the y-axis.
Figure 3.
H/L ratios of female pied flycatchers.
Values are shown for the three treatment groups and un-manipulated birds in the Netherlands and Sweden. Medians are shown, with boxes for the 25% to 75% percentiles and whiskers for 10% to 90% of the data. Higher values indicate more stress. H/L values are presented on a log-scale. Translocated and Swedish control females had significantly higher H/L values (means: 1.55 and 1.0, respectively) than the Dutch controls (mean: 0.40), while there was no significant difference between the two experimental groups breeding in Sweden. Significant differences (p<0.05) of post-hoc pairwise comparisons of groups are indicated by stars.