Change in the relative abundance of Lavinia symmetricus versus change in land cover.

Plotted is the relationship between the change in the relative abundance of L. symmetricus (California roach) with the change from non-urban to urban land cover at two scales: (a) within 3km upstream of the site, and (b) the total watershed area upstream of the site. For both plots, black circles represent urbanized sites and gray circles represent low-impacted sites. Spearman's rank correlation coefficient (r) and level of significance (p) are indicated on each panel.