Fig. 5.

Meta-analyses of correlations between floral signals (flower size, shape, colour, scent and inflorescence size) and nectar rewards (volume or sugar), separated by nectar reward type and the main pollinators (bird or insect). We pooled across signal type because the majority were flower size measures, which did not allow for comparisons across signal types. Number of correlations, plant species and studies for each category are included as columns in the table above the figure. Further details of the studies, analyses and raw data (as well as the individual Fisher’s z included for each summary point here) can be found in the online supplementary data.