Invasion
Invasion Description
1st Record: CA/Bodega Bay (1990, Sarver and Foltz 1993, molecular survey). .
Geographic Extent
Bodega Head/CA/Pacific Ocean (1995, Rawson et al. 1999); CA/Bodega Bay (1990, Sarver and Foltz 1993; 1995, Rawson et al. 1999; Braby and Somero 2006, Saarman and Poggson 2015, all molecular surveys).
Vectors
| Level | Vector |
|---|---|
| Alternate | None |
| Alternate | Natural Dispersal |
Regional Impacts
| Ecological Impact | Competition | |
| Based on field (Bodega Marine Laboratory, open coast) and lab experiments, Mytilus galloprovincialis displaces M. trossulus and M. californianus through interference competition (limiting movement, outfiltering, overgrowing) with the native mussels as well as simply outgrowing them (Shinen and Morgan 2009). In 1990-1991in Bodega Bay, purebred M. galloprovincialis comprised ~10% of total mussels sampled (Sarver and Foltz 1993), but ~60% in a 1994 survey (Rawson et al. 1999) and in 2002, at 2 sites, ~30-85% (Braby and Somero 2006). | ||
| Ecological Impact | Hybridization | |
| Mytilus galloprovincialis X M. trossulus hybrids comprised ~0-5% of total mussels sampled (Sarver and Foltz 1993), about 15% in a 1994 survey (Rawson et al. 1999) and in 2002, at 2 sites, ~10-15% (Braby and Somero 2006). | ||