Table 6.

Slope of song-type diversity versus distance (dependent variable) as a function of male aggressiveness, breeding stage (Ct = courtship, Inc = incubation, Prov = provisioning nestlings or fledglings), and territorial overlap (Ov = overlap, Ab = abut, Ga = gap), n = 28

Source	df	F	P	Directiona
Percent instigator	1	5.500	0.029	+
Breeding stage	2	2.116	0.144	Prov > Inc > Ct
Territory overlap	2	3.631	0.043	Ov < Ab > Ga

^aA positive slope or higher value means that diversity increases with distance and, thus, motivation decreases with distance.