Species Regional Summary
Mytilus galloprovincialis
None ( NWP-5 )

Invasion History Vectors Impacts References

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 ImpactCompetition
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 ImpactHybridization
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).
 

References

Full Reference List for Mytilus galloprovincialis

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