| Impact ID | 7543 |
| Impact Type | Competition |
| Study Type | Observational |
| Study Location | Field |
| Impact Description | When it was first reported, Nitellopsis obtusa was the ninth most frequently collected macrophyte in the St. Clair-Detroit River system, which could indicate it is outcompetiting native species. |
| Reference | 703 |
| Cost | |
| Location | Detroit River, USA |