Table 1.

Two-factor two-tailed ANOVAs on sperm performance data.

measure	species	factor	F	d.f.	p-value
average velocity (VSL)	P. maniculatus	group size	34.3	1	9.41 × 10−9
		donor male	16.7	8	<1 × 10−15
	P. polionotus	group size	42.1	1	2.52 × 10−10
		donor male	7.6	8	1.90 × 10−9
speed (VCL)	P. maniculatus	group size	2.1	1	0.15
		donor male	5.7	8	6.82 × 10−7
	P. polionotus	group size	3.5	1	0.06
		donor male	4.9	8	8.41 × 10−6
linearity (VSL/VCL)	P. maniculatus	group size	89.4	1	<1 × 10−15
		donor male	17.4	8	<1 × 10−15
	P. polionotus	group size	131.4	1	<1 × 10−15
		donor male	16.5	8	<1 × 10−15