Figure 2. Cx. tarsalis abundance and host diversity.

Culex tarsalis abundance and bloodmeal host diversity at a farmstead north of Davis, CA, from May 2008 through June 2009. Shading on the x-axis depicts the presence of nesting herons and egrets at the farmstead, with arrival beginning in April and departure in late August through September. A) Lines represent abundance of host-seeking females collected in CO₂ traps at the farmstead and nearby Yolo Bypass Wildlife Area and resting females collected in the walk-in red box. Bars shows percent of total bloodmeals identified as mammalian hosts. B) Total number of utilized host species and Shannon diversity index (H′) expressed as e ^H′. H′ increased both with increased number of hosts and the more even distribution of bloodmeals among host species.