Table 2.

Analyses of variance testing the effects of type of experimental mating (foreign versus local) and female population origin on adult male (F=1.91, d.f.=11, 168, p=0.04) and adult female (F=3.5, d.f.=11, 168, p=0.0002) masses of offspring produced by those crosses in D. melanogaster.

variable	source of variation	SS	d.f.	F	p
adult male mass	foreign versus local mating	1.2×10−3	1	0.33	0.56
female population	7.1×10−5	5	1.14	0.34
foreign versus local mating×female population	1.9×10−3	5	1.79	0.12
adult female mass	foreign versus local mating	4.8×10−3	1	7.38	0.007
female population	7.1×10−3	5	2.19	0.06
foreign versus local mating×female population	10.7×10−3	5	3.27	0.008