Table 3. Average ratio Dreissena spp. weight: host unionid weight for unionid species collected in waterbodies dominated by different Dreissena species.

Unionid species	D. polymorpha-dominated western Lake Erie (1990) and the Detroit River (1992)a	D. polymorpha-dominated lakes (St. Clair, Burt, Douglas, Paradise) (2011–2012)b	D. r. bugensis-dominated lower Great Lakes (2011–2012)b
Elliptio spp.	0.674	0.416	0.072
Lampsilis spp.	0.734	0.672	0.083
Lasmigona costata	0.264	0.324
Leptodea fragilis	1.357	0.003	0.102
Ligumia spp.	0.510	0.915	0.005
Potamilus alatus	0.377	0.493	0.126
Villosa iris	0.953	0.877
Fusconaia flava	0.989	1.223
Amblema plicata	0.537	0.017	0.080
Pyganodon grandis	1.936	0.119	0.039
Quadrula quadrula	0.424		0.026

Unionids were collected during the peak of Dreissena polymorpha invasion in western Lake Erie (1990) and in the Detroit River (1992) [71], and in present study from D. polymorpha-dominated lakes (St. Clair, Burt, Douglas, Paradise) and D. r. bugensis-dominated lakes (Erie, Ontario).

^atotal dry weight was used.

^btotal wet weight was used.