| Impact ID | 8219 |
| Impact Type | Habitat Alteration |
| Study Type | Observational |
| Study Location | Field |
| Impact Description | Reductions in phytoplankton abundance by 40-60% in a roughly 7 km stretch of the Potomac River, MD, relative to upstream and downstream segments. This was likely due to the very high densities of Corbicula fluminea in this stretch (an increase from 1.2 clams/m2 in 1977 to 1,467 clams/m2 in 1981) and the high filter feeding rates that were observed. |
| Reference | 13212 |
| Cost | |
| Location | Potomac River, Maryland, USA |