| Impact ID | 6321 |
| Impact Type | Competition |
| Study Type | Observational |
| Study Location | Field |
| Impact Description | Following its initial establishment, Echinogammarus ischnus became one of the most abundant benthic invertebrates in the Lake Ontario, Lake Michigan, and Lake Erie watersheds, where it locally displaced the native amphipod Gammarus fasciatus. The initial replacement of G. fasciatus by E. ischnus occurred in primarily rocky and dreissenid-covered habitats, while G. fasciatus populations continued to persist on algal and macrophyte covered substrates. |
| Reference | 16364 |
| Cost | |
| Location | Great Lakes, USA |