Invasion
Invasion Description
1st Record: Muir Beach/CA/Pacific Ocean (1987, McDonald and Koehn 1988; McDonald et al. 1991, molecular survey)
Geographic Extent
Muir Beach/CA/Pacific Ocean (1987, McDonald and Koehn 1988; McDonald et al. 1991, molecular survey).
Vectors
| Level | Vector |
|---|---|
| Alternate | None |
| Alternate | Natural Dispersal |
Regional Impacts
| Ecological Impact | Hybridization | |
| In 1994-1995, ~16% of mussels examined at Muir Beach were hybrids (M. trossulus X M. galloprovincialis) compared with 56% purebred M. trossulus (Rawson et al. 1999). Changing environmental conditions (declining water temperatures) due to climate cycles, have probably reduced the frequency of M. galloprovincialis (Braby and Somero 2006; Hilbish et al. 2010). | ||
| Ecological Impact | Competition | |
| In 1994-1995, about 32% of mussels examined at Muir Beach were purebred M. galloprovincialis, while 52% were M. trossulus (Rawson et al. 1999). | ||