Figure 3.

Effects of nitrogen and sodium on fecundity and eye width. Shown are plots of data for three of the significant univariate analyses (figure 2): (a) nitrogen and fecundity, (b) nitrogen and eye width and (c) sodium and eye width. Data shown are individual-level data, although the regressions performed were at the species-level. All data were mean centered and standardized. Dotted lines and p-values given are from PGLS regressions, while solid lines and shaded area are the predicted values and standard errors from a LOESS regression uncorrected for phylogeny, both at the species-level. Full statistical details are presented in electronic supplementary material, tables S1 and S3. (Online version in colour.)