Figure 3. Infestation parameters of unionids by species collected from waterbodies dominated by zebra or quagga mussels.

Proportion of unionids infested by dreissenids by unionid species, proportion of unionids with evidence of past infestation (regardless of Dreissena presence), Dreissena spp./host unionid wet weight ratios, and the proportion of uninfested unionids of those with past infestation in waterbodies dominated by D. polymorpha (Lake St. Clair, the Detroit River, Paradise, Douglas and Burt lakes in Michigan, magenta bars) and in lakes Erie and Ontario dominated by D. r. bugensis (purple bars).