| Impact ID | 4630 |
| Impact Type | Competition |
| Study Type | Anecdotal |
| Study Location | N/A |
| Impact Description | Trapa natans grows densely, shading the water and blocking the sun, preventing light penetration to other native plants. |
| Reference | 15733 |
| Great Lakes Region | No |
| Cost | |
| Location | Chesapeake Bay Watershed, US |
