Fig. 3

Effects of the interactions between climate and size on reflectivity. Trend lines were calculated based on the estimates of the PGLS models but only the correlations with p-value < 0.05 in the MCC tree are shown (Supplementary 6). The negative of the principal components is plotted for easier interpretation. PC2 was fixed at the mean value for all beetles in (a) and (b) while PC1 was fixed at the mean value for all beetles in (c) and (d). For visualization, species are divided into those smaller and larger than the mean body size (2.25 cm). The plots show the mean and standard deviation (error bars) of the studied optical properties and PC values per species. NIR reflectivity is given as the residuals of a simple linear model with visible reflectivity as a predictor for visualization purposes. PGLS analyses excluding the species circled in (c) and (d) did not show any correlation between temperature and NIR reflectivity (Supplementary Table S5 and S6).