| Impact ID | 8020 |
| Impact Type | Competition |
| Study Type | Observational |
| Study Location | Field |
| Impact Description | There are discrepancies regarding the extent of common frogbit (Hydrocharis morsus-ranae) in the Great Lakes. This species rarely becomes dominant in lakes' wetlands. |
| Reference | 18821 |
| Cost | |
| Location | Great Lakes, USA |