Invasion
Invasion Description
1st Record: CA/Bodega Harbor (2003, Bullard et al. 2007)
Geographic Extent
CA/Bodega Harbor (2003, Bullard et al. 2007; 2011, California Department of Fish and Wildlife 2014); Mason's Marina/CA/Bodega Harbor (2004, de Rivera et al. 2005); Porto Bodega Marina/CA/Bodega Harbor (2004, de Rivera et al. 2005)
Vectors
| Level | Vector |
|---|---|
| Alternate | None |
| Alternate | Oyster Accidental |
Regional Impacts
| Ecological Impact | Competition | |
| Didemnum vexillum was one of several invasive fouling species which showed increased growth (% coverage) at temperatures 3.5 and 4.5⁰C above the ambient temperature in Bodega Harbor (13.5⁰C), while the native Distaplia occidentalis showed reduced survival (Sorte et al. 2010). Didemnum vexillum was one of a group of seven non-native species, most of which were rare or absent in 1970-1971, but were among the eight most abundant species in 2005-2009. Spawning periods and abundance of species in this group appeared to be favored by a 1⁰C increase in average temperatures at this site over a 30-year period (Sorte and Stachowicz 2011). | ||