Table 1.

Analysis of variance (F=7.2, d.f.=71, 354, p<0.0001, r²=0.59) of female fitness in experimental combinations of males and females from different B-populations.

source of variation	MS	d.f.	F	p
male population	278.8	5	14.1	<0.0001
female population	247.7	5	12.5	<0.0001
block	1107.6	1	55.9	<0.0001
male population×female population	124.3	25	6.3	<0.0001
male population×block	25.4	5	1.3	0.27
female population×block	178.3	5	9.0	<0.0001
male population×female population×block	99.3	25	5.0	<0.0001