Relationships among male traits (N = 116 for all traits except haemogregarines for which N = 101).

Pearson correlation coefficients are below the diagonal and P values are above the diagonal. As haemogregarines is a categorical variable, values below the diagonal are F-statistics from a general linear model. Mass, head depth and jaw length are size-corrected residuals. SL stands for spectral location, SP for spectral purity and SI for spectral intensity. Relationships that are significant after sequential Bonferroni correction for multiple tests are in bold.