Figures & data
Table 1. Descriptive statistics of the number of farm animals at breeding sites (farmsteads) and villages located in southwestern Poland where faeces of nestling Barn Swallows Hirundo rustica were gathered in 2005; values given are means with 95% confidence intervals (95% CI).
Table 2. Component values and factor loadings of the Principal Component Analysis (PCA) of the characteristic farm animals at breeding sites and villages used as environmental predictors explaining the diet variables of nestling Barn Swallows Hirundo rustica; factor rotation: varimax normalized; figures in bold indicate the variable for which each factor indicated the most variability.
Table 3. General comparison of diet variables (mean ± 1 se) of nestling Barn Swallows Hirundo rustica from all 52 breeding sites (farmhouses), where there were various farm animals compared to sites without farm animals; large animals comprises cows, pigs and horses. Different letters indicate statistically significant differences (P ≤ 0.05) obtained in ANOVA GLM on paired comparisons between the two data sets.
Figure 1. CCA ordination biplot showing the locations of the 22 diet variables (explanation of abbreviations given in ) of nestling Barn Swallows Hirundo rustica in relation to different farm animals (cows, pigs; other large animals (= large animals) and poultry) reared in breeding sites (small letter) and villages (= vill; large letter); 10 explanatory variables, including 8 variables representing various species of livestock, number of nests in a colony (‘Nests’) and sites without livestock (‘Non-anim’) are depicted by arrows.
