| Impact ID | 9784 |
| Impact Type | Competition |
| Study Type | Experimental |
| Study Location | Laboratory |
| Impact Description | Invasive Echinogammarus ischnus is replacing Gammarus fasciatus at some sites in the upper St. Lawrence River (where G. fasciatus is native). However, they coexist in other habitats. |
| Reference | 24601 |
| Cost | |
| Location | |