Multi-trait FDses of (a) dragonfly and (b) damselfly assemblages depending on summer temperature across the study regions of Great Britain, Bavaria and Catalonia. Solid coloured lines represent linear model including study region as interaction effect (Multi-trait FDses ~ Temp*Study-region). Black curved line indicates a linear model with a quadratic term without considering study region (Multi-trait FDses ~ Temp +Temp2). Dahsed line represents non significant model. Assemblages of Great Britain were undersampled (see methods). FDses >0 indicates morphological overdispersion and FDses <0 morphological underdispersion relative to random assemblages of equal richness.