| Impact ID | 8663 |
| Impact Type | Competition |
| Study Type | Observational |
| Study Location | Field |
| Impact Description | Marsilea quadrifolia only migrated 151 feet per year in Spring Creek, Illinois, for a total range expansion of 1 mile downstream in 35 years. |
| Reference | 18049 |
| Cost | |
| Location | McDonough County, Illinois |