| Impact ID | 6522 |
| Impact Type | Competition |
| Study Type | Anecdotal |
| Study Location | N/A |
| Impact Description | Sooty crayfish (Pacifastacus nigrescens) has become extinct partly due to interspecific competition with Pacifastacus leniusculus, which was introduced into its range. P. leniusculus has also been implicated in causing a reduction in the range of the already narrowly endemic shasta crayfish (Pacifastacus fortis). |
| Reference | 42008 |
| Cost | |
| Location | |