| Impact ID | 7815 |
| Impact Type | Competition |
| Study Type | Observational |
| Study Location | Field |
| Impact Description | Black alder (Alnus glutinosa) is an ornamental species, but may be discouraged for use in natural areas due to its reported ability to form monocultures. |
| Reference | 25064 |
| Cost | |
| Location | Niagara River, New York, USA |