Table 3.

Akaike's information criterion value corrected for small sample size (AIC _c), the difference in AIC _c between a given model and the model with the lowest AIC _c value (ΔAIC _c), Akaike weights (w _i) of time-series models built using the mean latitude of Rusty Blackbirds encountered on BBS routes as the dependant variable, and the independent variables listed in the first column at lags from zero to eight years. Only models receiving AICc values less that the null model are shown. A correction for shifts in survey effort was included in each model. Data were gathered from the North American BBS

Variable	Lag (years)	AIC c	ΔAIC c	w i
Pacific Decadal Oscillation	6	123.79	0	0.99
Canadian breeding temperature	7	137.43	13.64	0
El Niño Southern Oscillation	6	138.35	14.56	0
U.S. winter temperature	6	140.62	16.83	0
Annual Canadian temperature	6	141.73	17.94	0
Pacific Decadal Oscillation	4	142.60	18.81	0
North Atlantic Oscillation	0	142.63	18.84	0
Null	0	142.67	18.88	0