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

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).