Invasion
Invasion Description
1st Record: Port Weller-Niagara-on-the Lake/Ontario/Lake Ontario (1996, Dermott et al. 1998)
Geographic Extent
Port Weller-Niagara-on-the Lake/Ontario/Lake Ontario (1996, Dermott et al. 1998); Prescott/NY/St. Lawrence River (1997, Dermott et al. 1998)
Vectors
| Level | Vector |
|---|---|
| Alternate | Natural Dispersal |
| Alternate | Ballast Water |
Regional Impacts
| Ecological Impact | Competition | |
| Echinogammarus ischnus has largely replaced the native Gammarus fasciatus (Dermott et al. 1998), in the upper St. Lawrence River, but this may be due to selective predation by the Round Goby [Neogobius melanostomus (Overdijk et al. 2003)], or due to abiotic factors such as calcium concentration and conductivity (Kestrup and Ricciardi 2009). | ||
| Ecological Impact | Predation | |
| In the upper St. Lawrence River, Echinogammarus ischnus and Gammarus fasciatus are mutual predators, with E. ischnus prevailing at higher conductivity, and declining due to predation duiring periods of lower conductivity and heavy spring riverflows (Kestrup and Ricciardi 2009). | ||