3.1 | Trait-environment relationships
In all multiple regression models, the colour lightness of the assemblages of odonates increased with increasing annual mean temperature and body volume decreased with increasing annual mean temperature (Table 1). In all multiple regression models, the colour lightness of the assemblages of odonates was not affected by annual precipitation, but except for phylogenetically corrected models, body volume increased with increasing annual precipitation. These results were consistent with the results of single regression models (except that single regression of the average and phylogenetically predicted part of the variation in the colour lightness and annual mean temperature were not significant) and with the results of models that accounted for spatial autocorrelation (Table 1). The two climate predictors together explained up to between 20 % and 31 % of the variation in colour lightness and between 2 % and 4 % of the variation in body volume (Table 1, see Table S3 for single regression models).