Invasion
Invasion Description
1st Records: San Diego/CA/San Diego Bay (1987, McDonald and Koehn 1988, molecular survey; McDonald et al. 1991); Los Angeles/CA/Los Angeles Harbor (McDonald and Koehn 1988, molecular survey; McDonald et al. 1991, molecular survey)
The actual invasion date is unknown. This species was first detected in molecular surveys, which began in 1985 (McDonald and Koehn 1988; McDonald et al. 1991)
Geographic Extent
San Diego/CA/San Diego Bay (1987, McDonald and Koehn 1988; McDonald et al. 1991); San Diego/CA/San Diego Bay (1992; Geller et al. 1994; Suchanek et al. 1997); Chula Vista Boat Ramp, San Diego/CA/San Diego Bay (Cohen et al. 2002)
Vectors
| Level | Vector |
|---|---|
| Alternate | Ballast Water |
| Alternate | Hull Fouling |
| Alternate | None |
Regional Impacts
| Ecological Impact | Competition | |
| Competition with, and nearly complete replacement of, native M. trossulus occurred in San Diego Bay, possibly in the 1940s (Carlton 1979; McDonald et al. 1991; Suchanek et al. 1997). See the discussion of the bioregion for details. | ||
| Ecological Impact | Hybridization | |
| Hybridization between M. galloprovincialis and M. trossulus was probably widespread during the early invasion and replacement of M. trossulus. See the discussion for the bioregion for details. | ||