| Impact ID | 9066 |
| Impact Type | Competition |
| Study Type | Observational |
| Study Location | Field |
| Impact Description | Thalassia testudinum abundance decreased significantly with the introduction and increase in abundance of Halophila stipulacea over four years. Syringodium filiforme abundance remained stable during the same period. |
| Reference | 45843 |
| Great Lakes Region | No |
| Cost | |
| Location | Lac Bay |
