Invasion
Invasion Description
1st Records: Hokkaido/Japan/Lake Notoro, Sea of Ohotsk (2004, Brannock et al. 2009, 2.4% M. galloprovincialis); Saururu, Hokkaido/Japan/Sea of Ohotsk (2004, Brannock et al. 2009, 80% M. galloprovincialis)
Geographic Extent
Utoro-Sarufutsu, Hokkaido/Japan/Lake, Sea of Ohotsk (2004, Brannock et al. 2009, 3-89% M. galloprovincialis, 3-71 M. galloprovincialis X M. trossulus; 7-93% M. trossulus, 8 locations)
Vectors
| Level | Vector |
|---|---|
| Alternate | Hull Fouling |
| Alternate | Ballast Water |
Regional Impacts
| Ecological Impact | Competition | |
| At 6 of 8 sites on the north shore of Hokkaido, where M. trossulus once was the sole mussel species, M. galloprovincialis comprised more than 50% of mussels sampled in 2006 while purebred M. trossulus were 7-24% (Brannock and Hilbish 2010). | ||
| Ecological Impact | Hybridization | |
| The percentage of M. galloprovincialis X M. trossulus hybrids at 8 sites on the north shore of Hokkaido ranged from 0 to 71%. However, there was no evidence for introgression between the two species, suggesting genetic incompatibility and poor fertility of first generation hybrids, or poor survival of later generations (Brannock and Hilbish 2010). | ||