Figure 3. Correlation between (A) number of diseases (number of diseases affecting each coral species) and (B) prevalence (proportion of individuals infected in the population of a given species) with constitutive levels of immunity as measured with the Principal Component 1 (PC1) obtained from Principal Component Analysis of six immune measures (prophenoloxidase, melanin concentration, superoxide dismutase, peroxidase, catalase and inhibition of bacterial growth).
The correlations were determined with the Spearman's rank order index (ρ) for both disease susceptibility and prevalence. Green squares represent older, and blue circles modern lineages.