Invasion
Invasion Description
1st Record: Hamina/Finland/Gulf of Finland (2003, Pienimäki, et al. 2004)
Geographic Extent
Hamina/Finland/Gulf of Finland (2003, Pienimäki, et al. 2004); Primorsk/Russia/Neva River estuary (2004, Berezina et al. 2007; Berezina et al. 2017); Helsinki/Finland/Gulf of Finland (Packalén et al. 2008); Whole coastline/Finland-Estonia-Russia/Gulf of Finland (Kotta et al. 2013)
Vectors
| Level | Vector |
|---|---|
| Probable | Ballast Water |
Regional Impacts
| Ecological Impact | Competition | |
| Gammarus tigrinus is replacing and out-reproducing native Gammarus dueben, Gammarus zaddachi in the Gulf of Finland (Packalén et al. 2008) | ||
| Ecological Impact | Trophic Cascade | |
| Gammarus tigrinus is replacing more herbivorous native Gammarus duebeni and G. zaddachi, probably leading to decreased herbivory, increased algal biomass (Packalén et al. 2008) | ||