Table 1. Correlation coefficients between principal component scores (PC) and reflectance indices (see ‘Material & Methods’ for details).

	T - C				T - C - Male
	PC1		PC2		PC1		PC2
	r	P	r	P	r	P	r	P
UV chroma (320–400 nm)	0.12	0.09	−0.81	<0.0001	−0.28	0.02	−0.51	<0.0001
Blue chroma (400–500 nm)	0.80	<0.0001	−0.09	0.18	0.71	<0.0001	−0.21	0.08
Green chroma (500–600 nm)	0.44	<0.0001	0.61	<0.0001	0.08	0.49	0.56	<0.0001
Red chroma (600–700 nm)	−0.75	<0.0001	0.07	0.29	−0.60	<0.0001	0.23	0.06

Values in the columns with caption “T-C” and “T-C-Male” represent respectively correlations for the PCs obtained through PCA on the spectral data of cere color of T- and C-females for week −1 until week 10 and through PCA on the spectral data of cere color of untreated males and T- and C-females for week 10. Significant correlations are in bold (P<0.05).