Figure 2.

Equilibrium model predictions as energy acquisition rate θ increases. Panels a–d show the equilibrium abundances (solid), (dashed) and (dot-dash). The proximate resource for the immune system is highlighted in dark grey and the proximate resource for the pathogen is highlighted in light grey. Panels e–h show the immune abundances when the pathogen is present (solid, N+) and absent (dashed, N−). Note that increasing energy acquisition increases the number of immune cells even in the absence of infection because of the baseline immune allocation parameter a_B. Panels i–l show the pathogen load. Panels m–p show the net gain rate (solid, point-up triangles) and per capita loss rate (dashed, point-down triangles) of the pathogen's resource (the numerator and denominator, respectively, of the equations in Table2). Note that these quantities have different units (1/time vs. 1/pathogens/time). Parameter values are given in Table1.