Table 2. Estimates of parameters in Equation 1, describing costs and benefits of fibrosis and parasite infection on male nesting success and female ovary mass.

${\beta }_F$ indicates the fitness cost of fibrosis, ${\beta }_{\mathrm{I}}$the fitness cost of parasite infection, and $\gamma$ the benefit of fibrosis immune response. ± 1 Standard Error.

Population	${\mathit{\beta }}_{\mathit{F}}$	${\mathit{\beta }}_{\mathbf{I}}$	$\mathit{\gamma }$
Roselle Males	.24 ± .07	.22 ± .23	.19 ± .31
Boot Males	.24 ± .08	.27 ± .13	.18 ± .17
Roselle Females	64 ± 16	88 ± 35	62 ± 46