Invasion
Invasion Description
1st Record: Grays River Power Plant/WA/Columbia River (Sytsma et al. 2004); Trojan Power Plant/OR/Columbia River (2003, Sytsma et al. 2004)
Geographic Extent
Grays River Power Plant/WA/Columbia River (Sytsma et al. 2004); Trojan Power Plant/OR/Columbia River (2003, Sytsma et al. 2004); Astoria (RKm 8) to near Oak Point/WA/Columbia River (RKm 75)/OR-WA/Columbia River (Cordell et al. 2008b) Not found in long-term sampling at Vancouver, WA (2005-2013, Dexter est al. 2015)
Vectors
| Level | Vector |
|---|---|
| Probable | Ballast Water |
Regional Impacts
| Ecological Impact | Competition | |
| Competition- Limnoithona tetraspina appears to have replaced a previous introduction, L. sinensis, in the low-salinity region of the Columbia River estuary. Limnoithona sinensis was collected in the Columbia River in 1979-1980 surveys, but only L. tetraspina was found in 2003 (Sytsma et al. 2004). | ||