Table 1.

Correlations between different aspects of female investment and female morphology. (Correlations are based on female mean values from the two breeding rounds. Yolk hue is used as a proxy for total carotenoid content in eggs. Female beak colour was measured before the onset of breeding with spectrophotometry. ^*p<0.05, ^**p<0.01, ^***p<0.001.)

	yolk hue	egg volume	yolk mass	eggs per day	yolk testosterone	female beak colour	female mass	female condition
egg volume	0.14
yolk mass	−0.12	0.45*
eggs per day	0.40*	0.12	0.28
yolk testosterone	−0.30	0.48**	0.01	0.43*
female beak colour	0.35	0.03	0.20	0.14	0.26
female mass	0.04	0.31	0.20	−0.20	0.065	−0.13
female condition	0.05	0.11	0.16	−0.19	0.020	−0.10	0.86***
female fat score	−0.07	0.05	0.09	−0.21	−0.29	−0.09	0.63***	0.54**