Table 2.

Factors affecting the probability of association between parakeets and storks. Relative importance of habitat (urban and rural) and type of substrate (pylon, tree or roof) on the probability of protective nesting associations between monk parakeets Myiopsitta monachus and white storks Ciconia ciconia. Estimates and 95% confidence intervals (2.5 and 97.5%) were assessed after model averaging (ΔAIC ≤2). We considered that a given variable has no, weak or strong support when the 95% confidence interval strongly overlapped zero, barely overlapped zero (*), or did not overlap zero (**), respectively. k: number of parameters. AICc: Akaike Information Criterion corrected for small sample sizes. ΔAICc: difference between the AICc of model i and that of the best-supported model (i.e. the model with the lowest AICc); w: Akaike weights. R²: measure of how well the model explains the data

Model	k	AICc	ΔAICc	Weight	Variables	Estimate	2.5%	97.5%
substrate*habitat + year	5	234.58	0.00	0.58	substrate (pylon)	18.66	− 1814.86	1852.17
substrate*habitat	4	236.40	1.81	0.24	habitat (urban)	−4.59	−5.61	−3.58	**
substrate + habitat + year	4	237.66	3.08	0.13	year (2015)	−0.85	−1.73	0.03	*
substrate + habitat	3	239.22	4.64	0.06	habitat (urban)*substrate (pylon)	−32.65	− 6642.70	6577.41
habitat*year	4	257.07	22.49	0.00
habitat + year	3	260.93	26.35	0.00
habitat	2	261.53	26.95	0.00
substrate + year	3	318.70	84.12	0.00
substrate	2	320.07	85.48	0.00
	1	633.94	399.36	0.00
year	2	634.84	400.26	0.00

R² = 0.70