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   Dreissena polymorpha (mollusc)
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    Details of this species in Michigan
    Status: Alien
    Invasiveness: Invasive
    Occurrence: Established
    Source: Benson & Raikow, 2008
    Arrival Date:
    Introduction:
    Species Notes for this Location:
    Management Notes for this Location:
    Location Notes:
    Impacts:
    Reduction in native biodiversity: A sampling of the Detroit River in 1982-1983 before the introduction of Dreissena polymorpha and Dreissena bugensis resulted in 97% live unionids of 20 different species, whereas a sampling in 1992 after the introduction of the two Dreissena spp. resulted in only 10% live unionids of only 13 different species. Surveys of native freshwater mussels along main channels of the Detroit River from 1992-1994 showed that unionids had been extirpated from all but four sites in the upper reaches of the river due to impacts of dreissenid mussels (Schloesser et al, 1998; Schloesser et al, 2006).
    Last Modified: 10/12/2009 4:19:12 p.m.
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