Figure 2.

(a) Observed patterns of Salmonella prevalence pooled across six urban sites in southern Florida for white ibis (orange) and environmental samples (blue) during the 2015–2016 and 2016–2017 non-breeding seasons. Segments denote 95% confidence intervals (Wilson method), and points are scaled by sample size. (b) Test for density-dependent transmission of Salmonella as the relationship between log flock size and infection prevalence in white ibis per each site and time point. The band shows the 95% confidence interval from the GLMM (1000 bootstraps). Data from 2015 to 2016 are shown as circles, and data from 2016 to 2017 are shown as triangles. (Online version in colour.)