| Impact ID | 9224 |
| Impact Type | Competition |
| Study Type | Observational |
| Study Location | Field |
| Impact Description | Research from South America, indicate Hydrilla verticillata invaded sites regardless of species diversity and whether dominant native macrophytes were already present. |
| Reference | 42772 |
| Great Lakes Region | No |
| Cost | |
| Location | Rosana Reservoir, Brazil |
