Invasion
Invasion Description
1st Record: Los Angeles/CA/Los Angeles Harbor (1987, McDonald and Koehn 1988; McDonald et al. 1991)
Geographic Extent
Long Beach Yacht Club/CA/Alamitos Bay (2000, Cohen et al. 2002); Long Beach/CA/Colorado Lagoon (2000, Cohen et al. 2002); Pilot's Dock F, Long Beach/CA/Long Beach Harbor (2000, Cohen et al. 2002); Los Angeles/CA/Los Angeles Harbor (1987, McDonald and Koehn 1988; McDonald et al. 1991); Newmarks Yacht Harbor, Watchorn Basin/CA/Los Angeles Harbor (2000, Cohen et al. 2002); Cabrillo Boat Ramp, Los Angeles/CA/Los Angeles Harbor (2000, Cohen et al. 2002); Los Angeles/CA/Rainbow Lagoon (2000, Cohen et al. 2002)
Vectors
| Level | Vector |
|---|---|
| Alternate | Ballast Water |
| Alternate | Hull Fouling |
Regional Impacts
| Ecological Impact | Competition | |
| Competition with, and nearly complete replacement of, native M. trossulus occurred in southern California waters, possibly in the 1940s (Carlton 1979; McDonald et al. 1991; Suchanek et al. 1997). | ||
| 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. | ||