Table 1. Results of ANOVAs on effect of returning foragers and foraging rate.

	Overall model			Main effects
				Colony			Year			Day (nested in year)
	Adjusted r2	F	P	DF	F	P	DF	F	P	DF	F	P
Effect of returning foragers (c)	0.39	2.4	0.001	16	1.14	0.35	2	13.63	<0.0001	24	1.86	0.03
Foraging rate (ants/sec)	0.47	2.98	<0.0001	16	4.78	<0.0001	2	11.98	<0.0001	24	1.81	0.04