| Impact ID | 9225 |
| Impact Type | Competition |
| Study Type | Experimental |
| Study Location | Field |
| Impact Description | Invasive Hydrilla verticillata reduced the growth of native Egeria najas regardless of sediment type. Researchers believe this indicated E. najas will be unable colonize sites where H. verticillata is abundant. |
| Reference | 42771 |
| Cost | |
| Location | Paraná River, Brazil |