Fig. 2

Innate Immunity declines with age in adult K. flavescens. A Bactericidal Competence and B Complement-mediated lysis decreased with age similarly for adult male and female yellow mud turtles (See Table 2 for statistical output). C Natural Antibodies (NAbs) showed the same trend. In all panels, the Y-axis represents residuals from linear models with age removed from the model (Table 2). The X-axis is z-transformed age with inset lines to indicate age-in-years for male and female adult turtles. Regressions: BC residuals = − 0.138(zAge), R² = 0.06; Lysis residuals = − 0.01(zAge), R² = 0.02; NAbs residuals = − 0.01(zAge), R² = 0.01