Table 2.

Analyses of variation in relative fitness (estimated as the difference in mean weight at fledging, standardized by year) of nestling collared and pied flycatchers being reared together in relation to species identity of the adult birds attending the nest, and timing of breeding (hatching date, standardized by year). (Model F_3,84=5.96, p<0.001.) SS, sums of squares.

source	d.f.	SS	F	p
species	1	4.068	4.422	0.038
hatching date	1	9.537	10.366	0.002
hatching date×species	1	3.459	3.760	0.056