Table 2. Parameter estimates and P-values of the model explaining abundances of bird flies in different bird species.

Variable	Posterior estimate (min, max)	p-value
(Intercept)	-4.57 (-6.74, -2.55)	<0.001
Age (adults compared to young)	-0.08 (-0.22, 0.05)	0.244
Habitat, forest	-0.22 (-1.12, 0.58)	0.558
Habitat, mires and mountains	-2.68 (-4.18, -0.96)	<0.001
Habitat, scrubland	-0.42 (-1.95, 0.99)	0.550
Habitat, wetland	-0.96 (-2.07, 0.34)	0.098
Predator (compared to non-predator)	2.26 (0.12, 4.28)	0.042
Migration, resident	0.23 (-0.80, 1.23)	0.660
Migration, short-distance migrant	-0.04 (-0.82, 0.86)	0.942
Nest site, land	-0.01 (-0.99, 0.97)	0.958
Nest site, openly on trees	0.30 (-0.76, 1.43)	0.560
Time, Jul-Sep	0.89 (0.58, 1.26)	<0.001
Time, Oct-Apr	-1.64 (-2.32, -1.01)	<0.001
Latitude	0.11 (0.04, 0.17)	<0.001

Age refers to the host age. Habitat classes were compared to hosts breeding farmlands. Migration strategy was compared to long-distance migratory hosts. Nest sites were compared to hosts breeding cavities. Time period was compared to situation in May-June. Latitude was centred decimal coordinate of the data collection site. Significant (p<0.05) variables are bolded.