Fig 4.

Correlation of bacterial diversity to urbanization (a), dietary provisioning (b), and bacterial community composition (c), and Salmonella prevalence (d). Circles represent average values for 15 capture sites and colored along an urban gradient from red (most urban) to blue (least urban). Bacterial diversity was not significantly correlated to landscape and dietary factors but was significantly associated with overall community composition and Salmonella prevalence (see text for statistics).