| Impact ID | 6987 |
| Impact Type | Competition |
| Study Type | Observational |
| Study Location | Field |
| Impact Description | In the Duck Lake waterways of Washington state, within a matter of three years, stonewart (Nitella spp.), native elodea, and pondweed (Potamogeton natans) were displaced completely by thick dense mats of Egeria densa. |
| Reference | 42092 |
| Cost | |
| Location | Duck Lake, Washington |