1st Record: off the southeast shore of North Bass Island/OH/Lake Erie (western basin) (USGS Nonindigenous Aquatic Species Program 2012)

off the southeast shore of North Bass Island/OH/Lake Erie (western basin) (USGS Nonindigenous Aquatic Species Program 2012)

Level	Vector
Probable	Ballast Water

Ecological Impact		Habitat Change
In transects off North Bass Island, abundance of benthic invertebrates was much greater in and around dreisssenid mussel colonies (dominated in biomass by D. bugensis, numerically by smaller D. polymorpha) compared with bare sediment. Among organisms strongly associated with mussels were amphipods (Gammarus fasciatus; Echinogammarus ischnus), copepods, ostracods, and Hydra sp. Dreissenid mussels provide shelter, structure for attachment, and also enrich the sediment with pseudofeces (Bially and MacIsaac 2000).

Species Regional Summary Dreissena bugensis _CDA_L095 (Cedar-Portage) ( L095 )