| Impact ID | 9722 |
| Impact Type | Competition |
| Study Type | Anecdotal |
| Study Location | N/A |
| Impact Description | Blooms of Didymosphenia geminata form mats which can be over 20 cm thick. These mats are capable of engulfing the stream bottom, smothering native species of plants, insects, mollusks, and algae, reducing habitat for insects for aquatic insects and fish. |
| Reference | 30502 |
| Great Lakes Region | No |
| Cost | |
| Location | |
