Species Regional Summary
Echinogammarus ischnus
Lake Ontario ( GL-III )

Invasion History Vectors Impacts References

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 ImpactCompetition
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 ImpactPredation
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).
 

References

Full Reference List for Echinogammarus ischnus

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