| Impact ID | 9783 |
| Impact Type | Competition |
| Study Type | Observational |
| Study Location | Field |
| Impact Description | Possible intraguild predation of introduced Gammarus fasciatus and competition for food may change population structure, causing a decrease of abundance or disappearance of native or alien gammarid species. |
| Reference | 30481 |
| Cost | |
| Location | Gulf of Finland |