| Impact ID | 7218 |
| Impact Type | Competition |
| Study Type | Observational |
| Study Location | Field |
| Impact Description | Thalassiosira pseudonana has been found in the Great Lakes basin composing 31% of the periphyton community and 90% of the plankton community. |
| Reference | 10425 |
| Cost | |
| Location | Portage River, Wood County, Ohio |