Table 1.

General linear models testing the effect of the social group size and body size on morphological parameters. Residuals of all models did not deviate significantly from a normal distribution (Kolmogorov–Smirnov, all p > 0.05).

morphological parameter	model fit	factor: social group size			covariate: body size
	r2	F	d.f.	p-value	F	d.f.	p-value
testis size	0.15	13.7	1,91	<0.001	3.8	1,91	0.053
ovary size	0.16	9.7	1,90	0.002	6.1	1,90	0.016
sex allocation	0.27	33.9	1,90	<0.001	0.7	1,90	0.407
seminal vesicle size	0.14	14.3	1,91	<0.001	0.4	1,91	0.514