Invasion
Invasion Description
1st Record: Cape Mendocino/CA/Pacific Ocean (1995, Rawson et al. 1999, molecular survey); In 2005-2007, the frequency of M. galloprovincialis and hybrids declined from ~40-70% to about 5%. This change was attributed to lower temperatures, resulting from the Pacific Decadal Oscillation (Hilbish et al. 2010).
Geographic Extent
Mendocino Headlands/CA/Pacific Ocean (1995, Rawson et al. 1999, molecular survey)
Vectors
| Level | Vector |
|---|---|
| Alternate | Ballast Water |
| Alternate | Hull Fouling |
Regional Impacts
| Ecological Impact | Competition | |
| In 1994-1995, purebred M. galloprovincialis comprised ~74% of mussels sampled at Cape Mendocino, while purebred M. trossulus were 18% (Rawson et al. 1999). In 2005-2007, the frequency of M. galloprovincialis and hybrids declined from ~20-40% to about 5%. This change was attributed to lower temperatures resulting from the Pacific Decadal Oscillation (Hilbish et al. 2010). | ||
| Ecological Impact | Hybridization | |
| In 1994-1995, purebred M. galloprovincialis comprised ~74% of mussels sampled at Cape Mendicino, while purebred M. trossulus were 18% (Rawson et al. 1999). In 2005-2007, the frequency of M. galloprovincialis and hybrids declined from ~20-40% to about 5%. This change was attributed to lower temperatures, resulting from the Pacific Decadal Oscillation (Hilbish et al. 2010). | ||