| Impact ID | 2995 |
| Impact Type | Predation/Herbivory |
| Study Type | Observational |
| Study Location | Field |
| Impact Description | Comparisons before and after the appearance of zebra mussels showed reductions of phytoplankton as high as 90% during all seasons in Lake Ontario. |
| Reference | 22715 |
| Great Lakes Region | Yes |
| Cost | |
| Location | Lake Ontario |
