Infestation of unionids by <i>Dreissena</i> spp. in the waterbodies surveyed in 2011–2012.

<p>Percent unionids infested by dreissenid mussels, the ratio of total wet weight of attached <i>Dreissena</i> spp. (>2 mm in size) to host unionid wet weight (mean ± standard error, median, lower and upper quartiles, sample size in parentheses), percent unionids with past infestation (unionids with or without <i>Dreissena</i> and with byssal threads) and percent <i>D. polymorpha</i> of total lake-wide dreissenid abundance are given for each waterbody studied (the lower Great Lakes, Lake St. Clair, the Detroit River, and inland lakes in north Michigan (Burt, Douglas, and Paradise lakes)).</p>a<p>Time since the first recorded finding. No <i>D. r. bugensis</i> was reported from lakes Burt, Douglas and Paradise.</p>b<p>D. Zanatta, unpublished data.</p><p>Infestation of unionids by <i>Dreissena</i> spp. in the waterbodies surveyed in 2011–2012.