| Impact ID | 4013 |
| Impact Type | Competition |
| Study Type | Anecdotal |
| Study Location | Field |
| Impact Description | It is speculated that the upper parts of starry stonewort (Nitellopsis obtusa) mats compete with phytoplankton for nutrients and other resources. |
| Reference | 19736 |
| Great Lakes Region | Yes |
| Cost | |
| Location | Michigan, USA |
